Renal & Urinary Workbook

Unit 1 · The Kidneys: Why Should We Care? 🫘

Before you learn the diseases — the kidneys have ONE job: keep the body in balance.

The six jobs. Every renal disease in this module is one of these six jobs failing. Learn the six, and the signs and symptoms write themselves.

🩺 Think Like a Nurse

Your patient has crackles, +3 edema, weight gain, and urine output of 80 mL today. You don't know the diagnosis yet.

• What kidney function has failed? Fluid removal. The kidney is not excreting water, so volume is being held in the vascular space and pushed into the interstitium and the lungs.
• What assessment finding worries you the most? The crackles — that is fluid in the alveoli, which is an airway/breathing problem.
• Why? Edema and weight gain are uncomfortable; pulmonary edema kills. ABCs put oxygenation ahead of everything else, so crackles + 80 mL of urine in a day means this patient is heading toward respiratory failure unless fluid comes off.

Also note: 80 mL in 24 hours is anuria (<100 mL/24 hr). Oliguria is <400 mL/24 hr, or less than 0.5 mL/kg/hr.

💬 Ask Claire: "I am learning renal disorders in nursing school. Teach me kidney function one body system at a time. After each function, stop and ask me to explain why losing that function creates the symptoms seen in patients."

Unit 2 · Pattern Recognition 📈

Don't memorize diseases. Recognize patterns. Finish the arrows.

Pattern #1 — When filtration decreases

Pattern #2 — When water cannot leave

Pattern #3 — When potassium cannot leave

⛔ Stop & Think — which problem could kill your patient FIRST?

• ☐ Elevated BUN — ❌ Makes the patient feel awful (nausea, confusion) but does not stop the heart today.
• ☐ Elevated creatinine — ❌ Tells you how injured the kidney is. It is a marker, not the killer.
• ☐ Hyperkalemia — ✅ THIS ONE. Potassium changes cardiac membrane excitability — lethal dysrhythmias can occur within minutes.
• ☐ Anemia — ❌ Chronic and treatable with epoetin alfa and iron; it is a "weeks" problem, not a "minutes" problem.

Renal rule #1: the lab that kills first is potassium.

Unit 3 · The Renal Detective 🔎

Look only at the assessment. Can you figure out what's happening?

Patient #1 — 82 y/o, vomiting 4 days, BP 82/46, HR 124, UOP 15 mL/hr, BUN ↑, Cr ↑, K⁺ 5.0

• ☐ Prerenal — ✅ Prerenal AKI. Four days of vomiting = volume loss → hypotension → the kidney is not being perfused.
• ☐ Intrarenal — ❌ Nothing here is toxic to or inflaming the kidney tissue itself.
• ☐ Postrenal — ❌ No obstruction: no distended bladder, no BPH history, no stone.

Evidence? Hypotension (82/46) + tachycardia (124, compensating) + dry losses + oliguria (15 mL/hr is well under 0.5 mL/kg/hr). Classic prerenal picture: BUN rises out of proportion to creatinine — a BUN:creatinine ratio above about 20:1, because the slow tubular flow lets urea be reabsorbed.

Patient #2 — Received IV contrast yesterday; creatinine doubled overnight; urine output down

• Diagnosis? Intrarenal AKI — contrast-induced nephropathy / acute tubular necrosis (ATN)
• Why? Iodinated contrast is directly toxic to the tubular cells and causes renal vasoconstriction, so the damage is inside the kidney. It typically shows up 24–72 hours after the scan. Prevention: hydrate with IV isotonic fluid before and after, use the smallest dye load, and hold nephrotoxins such as NSAIDs, aminoglycosides and metformin around the study.

Patient #3 — History of BPH, distended bladder, cannot urinate, pain 8/10

• Diagnosis? Postrenal AKI from acute urinary retention caused by the enlarged prostate obstructing the urethra
• What intervention comes FIRST? Relieve the obstruction — bladder scan and then insert a urinary catheter per order to drain the bladder. Nothing else works until urine can leave; the back-pressure is what is destroying the kidney, and draining it also fixes the 8/10 pain.

⚠️ After you drain: Watch for post-obstructive diuresis — huge urine volumes over the next hours with hypotension, hypokalemia and hyponatremia. Monitor I&O, BP and electrolytes closely.

Notice: you haven't memorized anything — you reasoned. That is exactly what NCLEX wants.

Unit 4 · Renal Diagnostics 🧪 — What Are the Kidneys Trying to Tell You?

The kidney is a coffee filter. If the filter clogs, the waste doesn't leave — it stays in the bloodstream. That is why kidney disease causes abnormal labs.

Lab Detective

⭐ Nursing Pearl

Creatinine is the BEST indicator of kidney function. Unlike BUN, it is barely affected by hydration status, diet, or GI bleeding — it comes from muscle at a steady rate, so a rise means the filter has failed.

Let's Practice — BUN 42, Creatinine 3.1, GFR 18, K⁺ 6.2

• What concerns you FIRST? The potassium of 6.2 mEq/L.
• Why? It is the only value on that list that can cause a fatal dysrhythmia in the next few minutes. Get a 12-lead/telemetry, look for peaked T waves, and expect calcium gluconate, insulin + dextrose, and a plan for removal (binder or dialysis). The GFR of 18 tells you this is stage 4–5 disease — important, but not the emergency.

⛔ Stop and Think — which value means immediate risk of sudden death?

• ☐ BUN — ❌ Reflects waste build-up and hydration; causes symptoms, not arrest.
• ☐ Creatinine — ❌ Best measure of function, but a high number does not itself stop the heart.
• ☐ Potassium — ✅ Yes. Hyperkalemia depolarizes the cardiac membrane → peaked T waves, wide QRS, VF/asystole.
• ☐ GFR — ❌ Stages the disease and guides drug dosing; a chronic number, not an acute threat.

Clinical Judgment — "The patient's creatinine doubled overnight." What questions pop into your head?

• 1. Is the patient making urine? How many mL in the last hour and the last 24 hours?
• 2. What did we do to them? Any IV contrast, NSAIDs, aminoglycosides, vancomycin, ACE inhibitors, or a hypotensive episode in the last 48 hours?
• 3. What is the potassium (and the ECG)? Doubling creatinine means K⁺ and acid are being retained too.
• 4. Is it volume? What are the BP, HR, weight, and I&O trend — are they dry (prerenal) or overloaded?
• 5. Could this be obstruction? Bladder scan — a distended bladder is fixable in five minutes.

💬 Ask Claire: "I am studying renal laboratory values. Instead of making me memorize numbers, teach me what each lab means and how it changes in kidney disease. Quiz me using patient scenarios."

Unit 5 · Urinary Tract Infections 🦠

Picture where the infection is. The higher the infection travels, the sicker the patient becomes.

Follow the Infection — complete the pathway

Why women get more UTIs: a much shorter urethra sitting closer to the rectum, so E. coli — the cause of ~80–90% of UTIs — has a shorter trip.

Which Infection Is It?

Pattern Recognition — lower UTI vs. kidney infection

🩺 Think Like the Nurse — "My back really hurts," right over the costovertebral angle

• Why does this matter? CVA tenderness means the pain is over the kidney, not the bladder. The infection has ascended — think pyelonephritis, which is a systemic infection that can scar the kidney and seed the bloodstream.
• ⛔ What assessment should you perform next? Take a full set of vital signs — temperature, HR, BP, RR and mental status — looking for the sepsis picture (fever, HR >100, SBP <100, confusion). Then percuss the CVA gently and check the urine.

Clinical Case — Mrs. Wilson, 79, "she just isn't acting like herself"

Temp 100.9°F · confused · weak · urinary frequency · BP 100/62 · HR 112

• Q1 — What should the nurse suspect FIRST? A urinary tract infection, likely already ascending — and possible early urosepsis. Get a urinalysis with culture, blood cultures, and vitals.
• Q2 — Why is this different from a younger adult? Older adults often do not mount the classic burning/frequency picture or a high fever. Their presenting sign is a change in mental status — new confusion, falls, incontinence, decreased appetite, or generalized weakness. A "normal" temperature can still be a fever for them because their baseline is lower.
• Q3 — Which finding makes her higher priority? The combination of HR 112 with BP 100/62 and altered mental status. That is early sepsis physiology — she is compensating now, and a falling BP is next.

Urinalysis Detective

Cloudy · nitrites positive · leukocyte esterase positive · WBC elevated · bacteria present · SG 1.025 · trace protein

• Most likely diagnosis? Bacterial urinary tract infection. Positive nitrites = gram-negative bacteria (usually E. coli) converting dietary nitrate; positive leukocyte esterase + WBCs = the inflammatory response.
• Would you expect antibiotics? YES / NO YES — this is a symptomatic bacterial infection. Culture first, then antibiotics. Note SG 1.025 is normal-to-concentrated (normal 1.005–1.030) and trace protein is not alarming here.

Priority Nursing Actions — number 1 (first) to 5 (last)

• 1 — Assess pain (assessment before intervention; also tells you whether this is bladder or flank pain)
• 2 — Obtain urine culture (must be collected BEFORE the first antibiotic dose)
• 3 — Administer prescribed antibiotic (treat the infection promptly once the specimen is in hand)
• 4 — Encourage oral fluids (flushes bacteria; supportive, not urgent)
• 5 — Teach front-to-back wiping (prevention/teaching is always last when someone is acutely ill)

Why must the culture come before antibiotics? Even one dose can suppress bacterial growth and give a false-negative culture. Without a positive culture and sensitivities you cannot narrow the antibiotic, so the patient stays on broad-spectrum therapy longer than necessary and resistant organisms get missed.

💬 Ask Claire: "Pretend I am caring for patients with urinary tract infections during clinical. Give me one patient at a time. Never tell me the diagnosis. Make me determine whether they have cystitis or pyelonephritis using only assessment findings and explain my reasoning before revealing the answer."

🩺 Clinical Connection

Don't stop at "this patient has a UTI." Ask: How sick are they? Has it spread upward? Could this become sepsis? And — the one that matters — what finding would make me call the provider immediately? Answer: fever with hypotension, tachycardia, rising lactate, or new confusion.

Unit 6 · Urinary Incontinence 💧

Don't memorize the types — meet the patients. For each one ask: "Why is this patient leaking urine?"

Patient A — 42 y/o woman: "Every time I laugh, sneeze, or cough, I leak a little."

• Type? Stress incontinence
• WHY? Weak pelvic floor muscles and a weak urethral sphincter, usually after childbirth, aging, or estrogen loss. A cough spikes intra-abdominal pressure above what the sphincter can hold, so a small amount escapes. The bladder itself is normal.
• First-line treatment? Pelvic floor muscle (Kegel) exercises — plus weight loss, avoiding caffeine/alcohol, and timed voiding. Surgery (sling) and pessaries come later.

Patient B — 73 y/o: "When I feel like I have to go, I have about 10 seconds."

• Type? Urge incontinence (overactive bladder)
• What is happening inside the bladder? The detrusor muscle contracts involuntarily and too early, before the bladder is actually full — so the urge is sudden, intense, and unstoppable.
• Nursing intervention? Bladder retraining with a timed voiding schedule, gradually lengthening the interval; cut caffeine, alcohol and artificial sweeteners; keep a path to the toilet clear; anticholinergics such as oxybutynin or tolterodine, or mirabegron, if prescribed.

Patient C — 82 y/o man with BPH: "I always feel full." Dribbles all day. Bladder scan 850 mL.

• Type? Overflow incontinence
• Why? The enlarged prostate obstructs outflow. The bladder over-distends, pressure inside exceeds sphincter resistance, and urine dribbles out over the top — while 850 mL stays behind. Leaking urine does NOT mean the bladder is empty.
• Priority nursing action? Relieve the retention — bladder scan (done: 850 mL) then catheterize per order. Because that retained volume causes back-pressure → hydronephrosis → postrenal AKI, plus a high infection risk.

Patient D — spinal cord injury; bladder empties without warning; no control

• Type? Reflex incontinence — a neurogenic bladder
• Why? The spinal cord lesion cuts the communication between bladder and brain. The bladder fills and the reflex arc fires a detrusor contraction at a set volume, with no sensation and no voluntary control. Managed with a scheduled program of intermittent catheterization.

Patient E — severe arthritis; can't unbutton pants fast enough

• Is the bladder working normally? YES / NO YES. The urinary system is intact.
• Then why is the patient incontinent? This is functional incontinence — a mobility, dexterity, cognition or environment problem, not a bladder problem. Fix the environment: elastic waistbands and Velcro, a bedside commode, a call light within reach, good lighting, clear pathways, and scheduled toileting.

Patient F — new incontinence after starting a diuretic; resolves when the drug is adjusted

• Type? Transient (temporary) incontinence — caused by a reversible trigger. Remember DIAPPERS: Delirium, Infection, Atrophic vaginitis, Pharmaceuticals, Psychological, Excess urine output, Restricted mobility, Stool impaction.

⛔ Stop & Think — no void in 10 hours, palpable bladder, leaking urine

• Should the nurse assume the bladder is empty? YES / NO NO.
• Why? Leaking with a palpable bladder is the classic picture of overflow — the bladder is so full it is spilling. Scan it. If a large residual is present, catheterize per order. Assuming "she's voiding, she's fine" is how retention becomes hydronephrosis.

💡 Clinical Pearl: Overflow incontinence fools students. Leaking urine sometimes means the bladder is too full, not empty.

💬 Ask Claire: "Give me six patient scenarios with different types of urinary incontinence. Do not tell me the diagnosis. Make me identify the type, explain the pathophysiology, and choose the priority nursing intervention."

Unit 7 · Bladder Cancer ⚠️

Lots of urinary problems cause blood in the urine. Bladder cancer is different because of HOW the blood shows up.

• The classic sign is gross, painless, intermittent hematuria — visibly bloody urine with no burning, no colic, no fever
• Why is this finding concerning? Painless bleeding means nothing is inflamed, obstructed, or spasming — so infection and stones do not explain it. Untreated bladder cancer keeps growing while the patient feels fine, and the bleeding is intermittent, so people talk themselves out of getting checked when it clears up.

Nursing Clue

"My urine has blood in it, but it doesn't hurt." The question that should come to mind: "Does this patient smoke, or have they ever?" — and then: painless hematuria in an adult is bladder cancer until proven otherwise. It needs cystoscopy, not reassurance.

Risk Factors

⛔ Why do smokers have such a high risk? Because urine is where the body dumps what it detoxifies. Whatever is inhaled ends up dissolved in urine, and that urine sits in the bladder for hours at a time — the bladder gets the longest, most concentrated exposure of any organ downstream of the lungs.

Diagnostic Match-Up

After cystoscopy, teach: pink-tinged urine and mild burning are expected for a day or two; increase fluids; report bright red bleeding with clots, inability to void, fever, or worsening pain.

Unit 8 · Urinary Diversions 🩹

After the bladder comes out, urine still has to leave the body. The surgeon builds a new road.

Draw the arrows — ileal conduit

Key point: an ileal conduit is incontinent and continuous — there is no storage and no sphincter, so urine drains constantly and the pouch is worn 24/7. Expect mucus in the urine; that is normal because the conduit is made of bowel.

What Does the Nurse Assess? — circle all that apply

• Stoma color — ✅ the single most important assessment — it tells you whether the tissue is perfused
• Skin integrity — ✅ alkaline urine excoriates peristomal skin quickly
• Urine output — ✅ must be at least ~30 mL/hr; no output = obstruction or hypovolemia
• Pulse quality — ❌ not a stoma assessment (still part of a general post-op check, just not part of this)
• Pouch seal — ✅ a leaking seal means skin breakdown and odor within hours
• Edema around stoma — ✅ mild edema is expected for the first few days; increasing edema is not

Healthy or Not? — a stoma should be…

• ☐ Pale — ❌ suggests anemia or poor perfusion
• ☐ Black — ❌ necrosis — a surgical emergency
• ☐ Moist and pink/red — ✅ correct — looks like the inside of your cheek, beefy red and shiny
• ☐ Dry — ❌ a healthy stoma is always moist; dryness signals compromise

🚨 Critical Thinking — the stoma suddenly turns dark purple

• Priority concern? Impaired blood supply to the stoma — ischemia progressing toward necrosis. Dusky/purple → black means the tissue is dying and the patient needs surgical revision.
• What should you do FIRST? Notify the surgeon immediately. Ischemic bowel does not recover on its own and cannot be fixed at the bedside. Meanwhile, remove any constricting pouch/belt, do not apply heat or massage, keep the patient NPO in case of a return to the OR, and document the exact color and time.

Mini Concept Map

💬 Ask Claire: "Teach me urinary diversions as if I am taking care of my first postoperative patient. Ask me assessment questions before giving me the answers."

🩺 End-of-Section Reflection — What Have You Learned? ⭐

Without looking back — biggest clue, and the thing you are most worried about.

Clinical Judgment — "I have blood in my urine." Five questions before you call the provider

• 1. Does it hurt? Painless points toward cancer; colicky flank pain points toward a stone; burning points toward infection.
• 2. When did it start, and is it every void or just at the beginning/end of the stream? Blood throughout suggests a kidney or bladder source.
• 3. What does it look like — bright red, pink, clots, or cola-colored? Cola/tea colored with edema and hypertension = glomerulonephritis, not bleeding.
• 4. What else is going on — fever, chills, flank pain, weight loss, trouble voiding?
• 5. What is your history? Smoking, chemical exposure, anticoagulants, recent procedure or catheter, trauma, strep infection 1–2 weeks ago, beets/rifampin (which just stain the urine).

💙 Clinical Tip

Nursing isn't recognizing a disease name. It is asking: Why is this happening? What is the priority? What complication am I trying to prevent? What assessment tells me my patient is getting worse? Answer those four and you are thinking like a nurse — which is exactly what NCLEX tests.

Unit 9 · Glomerulonephritis — When the Filter Becomes Inflamed 🔥

Normally: blood enters, waste leaves, protein stays, red cells stay. Now the filter develops tiny holes because it is inflamed.

What can now leak through? — circle all that apply

• □ Water — Water always crosses the filter — that is normal filtration. In GN the problem is that less water gets filtered out, so it is retained.
• □ Protein — ✅ Yes — but only a moderate amount in GN (usually <3.5 g/day). Massive protein loss belongs to nephrotic syndrome.
• □ Red blood cells — ✅ Yes — this is the signature. RBCs and RBC casts in the urine turn it cola/tea colored.
• □ White blood cells — ✅ Yes, WBCs and casts appear because the glomerulus is inflamed.

Build the Disease

🩺 Think Like a Nurse

• If the kidney filter is inflamed, would urine output increase or decrease? Decrease — oliguria.
• Explain WHY. Inflammation swells and narrows the glomerular capillary loops, so less plasma is filtered per minute (GFR drops). Less filtrate in = less urine out, and the salt and water that should have been excreted stay in the body → edema and hypertension.

Recognizing the Patient — check all that support glomerulonephritis

• □ Periorbital edema — ✅ Classic — puffy face/eyes on waking, because retained fluid settles in loose tissue overnight
• □ Cola-colored urine — ✅ The hallmark — RBCs and RBC casts in the urine
• □ Hypertension — ✅ From sodium and water retention plus RAAS activation
• □ Proteinuria — ✅ Present, but mild-to-moderate (<3.5 g/day)
• □ Oliguria — ✅ GFR has fallen
• □ Weight gain — ✅ Fluid retention — daily weight is the most reliable measure of it

Also expect: fatigue and malaise, headache, elevated BUN/creatinine, elevated ASO titer (evidence of recent strep), and low serum complement (C3).

Why Does This Happen?

🚨 Clinical Judgment — sudden dyspnea, crackles, SpO₂ 88%

• What complication is occurring? Acute pulmonary edema from fluid volume overload — the retained fluid has backed up into the lungs. (Circulatory overload can also push into heart failure.)
• What should the nurse do FIRST? Sit the patient upright in high Fowler's with the legs dependent and apply oxygen. That immediately reduces venous return and lets the diaphragm drop, so it improves oxygenation before any drug can. Then call the provider and anticipate IV furosemide, and keep the patient NPO/fluid-restricted.

Mini Concept Map

💬 Ask Claire: "Give me five patient scenarios with glomerulonephritis. Help me recognize the disease using only assessment findings. Make me explain WHY every symptom occurs."

Unit 10 · Nephrotic Syndrome — When the Filter Leaks Protein 🫧

Finish the Story

Why is albumin important? Albumin is a sponge — it pulls water into the bloodstream. If albumin drops, the water leaves the vessels and moves into the interstitial tissue. That is why the swelling is massive yet the intravascular volume can be low: the fluid is in the wrong compartment.

Clinical connection: nephrotic edema is not the kidney "making more fluid" — it is fluid leaving the blood vessels.

Assessment Detective — which patient has nephrotic syndrome?

• Patient A (cola-colored urine, hypertension, recent strep) — ❌ That is glomerulonephritis — blood is leaking, and there is a post-infectious trigger.
• Patient B (foamy urine, +4 pitting edema, albumin 2.1, proteinuria) — ✅ Nephrotic syndrome. Foam = protein in the urine; albumin 2.1 g/dL (normal 3.5–5.0) is the hypoalbuminemia; the +4 edema is the direct consequence of losing oncotic pressure.

Fill in the Table

⛔ Why does the liver make extra cholesterol? It is trying to compensate. The liver's response to falling plasma protein is to synthesize more protein — and lipoprotein synthesis rises along with albumin synthesis. It cannot keep up with the albumin loss, so what you actually see is a low albumin and a high cholesterol.

⚠️ The complication students forget: nephrotic syndrome is hypercoagulable — antithrombin III is lost in the urine along with albumin. Watch for DVT, PE, and renal vein thrombosis. Also watch for infection, because immunoglobulins are lost too.

⭐ Compare the Two Disorders

Explain this — one sentence for the biggest difference: Glomerulonephritis leaks blood (cola urine + hypertension), nephrotic syndrome leaks protein (foamy urine + massive edema + low albumin).

Priority Nursing Care — circle the priorities and say why

• Monitor blood pressure — ✅ Volume and RAAS shifts move the BP in both directions; ACE inhibitors/ARBs are used specifically to reduce proteinuria
• Daily weights — ✅ The single best measure of fluid status — 1 kg = 1 L. Same scale, same time, same clothing, after voiding
• Strict intake/output — ✅ Tells you whether the diuretic is working and whether output is keeping up with intake
• Assess edema — ✅ Grade and locate it; measure abdominal girth if ascites is present
• Monitor respiratory status — ✅ The one that outranks the rest — fluid moving into the lungs is the life-threatening turn
• Monitor albumin — ✅ Tracks severity and response; a rising albumin means the leak is closing
• Teach low-sodium diet — ✅ Sodium restriction limits the water it drags with it; protein is given at normal, not high, amounts — extra protein just gets spilled and worsens the injury

Clinical Judgment Activity

Weight ↑5 kg · albumin 2.0 · BP 146/88 · lungs clear · +4 edema · urine 4+ protein

• Q1 — What assessment finding is expected? All of them, actually — the 4+ proteinuria with albumin 2.0 and +4 pitting edema is textbook nephrotic syndrome. The 5 kg gain equals about 5 L of retained fluid.
• Q2 — What complication is MOST likely if fluid keeps increasing? Pulmonary edema — the lungs are clear now, which is exactly why you keep listening. Pleural effusion, ascites, and worsening skin breakdown follow the same fluid.
• Q3 — Which intervention best evaluates treatment effectiveness? Daily weight, measured the same way every day. It detects fluid change earlier and more reliably than edema grading or I&O records.

💬 Ask Claire: "Help me compare glomerulonephritis and nephrotic syndrome without memorizing. Use patient cases and ask me why each symptom occurs before giving the answer."

🧠 Pattern Check — answer without looking back

• Cola-colored urine makes me think: Glomerulonephritis
• Foamy urine makes me think: Nephrotic syndrome (protein loss)
• Massive protein loss makes me think: Nephrotic syndrome — and hypoalbuminemia, edema, hyperlipidemia, clotting risk
• Recent strep infection makes me think: Post-infectious acute glomerulonephritis (1–3 weeks later)
• Periorbital edema is commonly seen in: Both — but it is the classic morning finding of glomerulonephritis, and is part of the generalized edema of nephrotic syndrome
• The BEST way to monitor fluid status is: Daily weight on the same scale at the same time (1 kg = 1 L of fluid)

💙 Clinical Tip

Ask one question: what is leaking through the damaged glomerulus? Blood leaking → glomerulonephritis. Protein leaking → nephrotic syndrome.

Unit 11 · Acute Kidney Injury 🚨

Acute means it happened fast — hours to days. The good news: AKI is often reversible if the cause is found and treated early.

Where is the problem?

AKI Detective — Scenario #1 (83 y/o, 4 days vomiting/diarrhea, BP 82/48, HR 122, dry skin, UOP 12 mL/hr)

• Are the kidneys damaged? YES / NO NO — not yet. The tissue is intact.
• Then WHY are they failing? They are not being perfused. GI losses dropped the circulating volume, the MAP fell below what the glomeruli need to filter, and filtration stopped. Fix the volume and the kidney works again — but if the hypoperfusion continues, prerenal AKI becomes acute tubular necrosis, and then it IS damage.
• 🩺 What do the kidneys need before they can filter? Blood flow. Without perfusion, even perfectly healthy kidneys cannot work.

Scenario #2 — IV contrast; creatinine doubles overnight; urine output falls

• Before / Inside / After? Inside — intrarenal.
• Explain WHY. Contrast is a nephrotoxin: it constricts renal vessels and is directly toxic to tubular epithelium, producing acute tubular necrosis. The cells slough into the tubules and plug them. Other classic intrarenal causes: aminoglycosides, vancomycin, NSAIDs, rhabdomyolysis (myoglobin), transfusion reactions, glomerulonephritis, and prolonged prerenal ischemia.

Scenario #3 — severe BPH, no urine for 18 hours, distended bladder, creatinine rising

• Before / Inside / After? After — postrenal. The prostate is blocking outflow, urine backs up, pressure rises to the kidney, and filtration stops. Healthy kidneys cannot make urine if urine cannot leave. Postrenal AKI is the most rapidly reversible type — if you catch it before the nephrons are destroyed.

Build the Table

The Four Phases of AKI — follow the patient

Phase 1 — Onset. Write three examples of something that damages the kidneys.

• 1. A hypotensive event — hemorrhage, sepsis, prolonged surgery, or severe dehydration
• 2. A nephrotoxin — IV contrast, gentamicin, vancomycin, NSAIDs, or chemotherapy
• 3. An obstruction — BPH with retention, bilateral stones, or a blocked catheter

What assessment finding is MOST important during this phase? Urine output — hourly. A falling output (<0.5 mL/kg/hr or <30 mL/hr) is the earliest sign, and it appears before the creatinine moves. Catching it here is what makes AKI reversible.

Phase 2 — Oliguric phase. Fill in the blanks.

• Urine output becomes low — oliguric, <400 mL/24 hr (or <0.5 mL/kg/hr); sometimes anuric <100 mL/24 hr
• Fluid begins to accumulate — weight gain, edema, JVD, hypertension
• Potassium becomes elevated — hyperkalemia, the killer of this phase
• Creatinine becomes elevated — and keeps climbing daily
• BUN becomes elevated — azotemia → nausea, confusion, itching
• The lungs may develop crackles → pulmonary edema
• The ECG may show tall peaked T waves, then a flattened P wave and widened QRS
• Bonus — acid–base: metabolic acidosis (retained H⁺, lost bicarbonate) → Kussmaul respirations, and the acidosis drives potassium even higher
• Bonus — sodium: dilutional hyponatremia — the sodium looks low because it is swimming in retained water

⛔ Why is hyperkalemia the priority during this phase? Because it is the only abnormality here with a cardiac deadline. The kidney excretes ~90% of daily potassium; with no urine, potassium climbs while acidosis pushes even more K⁺ out of the cells. Peaked T waves → wide QRS → VF or asystole can happen in minutes, while the high BUN and edema unfold over days.

Clinical Picture — weight gain, +3 edema, crackles, BP 186/98, UOP 180 mL today, K⁺ 6.5

What is your FIRST concern? The potassium of 6.5 mEq/L. Put the patient on continuous cardiac monitoring, get a 12-lead, and notify the provider — anticipate IV calcium gluconate (cardiac membrane protection), then insulin + D50 and/or albuterol to shift K⁺ into cells, then sodium polystyrene sulfonate/patiromer or urgent dialysis to remove it. Crackles + 180 mL/day is the close second, and dialysis fixes both.

Prioritize! — number the interventions

• 1 — Monitor ECG (with K⁺ 6.5 this is the assessment that detects lethal change in real time)
• 2 — Review potassium level (confirms and trends the threat, and guides treatment)
• 3 — Assess lung sounds (breathing — crackles mean overload has reached the alveoli)
• 4 — Assess for edema (part of the volume picture, but peripheral edema is not immediately dangerous)
• 5 — Strict intake and output (essential ongoing monitoring; results accumulate over hours)
• 6 — Obtain daily weight (the best fluid measure, but it is a once-a-day trend, not a rescue)

Which intervention could save the patient's life TODAY? Cardiac monitoring plus acting on the potassium — recognizing peaked T waves and getting calcium gluconate, insulin/dextrose, and dialysis started.

Unit 12 · The Diuretic Phase — The Fluid Management FLIP 🔄

Students think: "The patient is peeing again, so they're better." Not so fast.

🩺 Think like the kidney — can they concentrate urine yet? YES / NO NO. The tubules recover their ability to filter before they recover their ability to concentrate. So the patient makes huge volumes of very dilute urine (specific gravity around 1.010) and dumps water and electrolytes they cannot afford to lose.

⭐ The flip — this is the highest-yield concept in AKI

Same patient, same disease, opposite orders. The exam loves this.

Why is this dangerous? — circle all that apply

• □ Dehydration — ✅ Losing liters of water a day with no ability to conserve it
• □ Hypotension — ✅ Falling intravascular volume → orthostasis, tachycardia, shock
• □ Hypokalemia — ✅ Potassium and sodium are dumped along with the water → flat T waves, U waves, weakness, dysrhythmias
• □ Fluid overload — ❌ That was the previous phase. Overload risk has flipped to deficit risk.

Fill in the Story

Nursing Priorities — circle the priorities

• Daily weight — ✅ Now you are watching for weight LOSS that is too fast — more than ~0.5–1 kg/day means over-diuresis
• Blood pressure — ✅ Hypotension is the expected danger of this phase
• Potassium — ✅ It flipped — now the risk is hypokalemia; check for flat T waves, U waves, weak muscles, ileus
• Intake and output — ✅ Output can exceed intake by liters; replacement is calculated from these numbers
• Fall precautions — ✅ Weak, hypotensive, dizzy patient making frequent urgent trips to the bathroom — a fall waiting to happen
• Orthostatic blood pressure — ✅ The earliest objective sign of volume depletion — a drop of ≥20 mmHg systolic or ≥10 mmHg diastolic on standing

🩺 Your patient made 5 liters of urine today. Celebrate or assess? Assess. Five liters is not recovery, it is a fluid and electrolyte emergency in slow motion. Check BP and orthostatics, HR, weight change, mucous membranes and skin turgor, mental status, and the potassium and sodium. Anticipate fluid replacement and potassium replacement, and put fall precautions in place.

Recovery Phase

How long? Weeks to months — sometimes up to a year. GFR climbs back toward baseline, but some patients are left with a permanently reduced GFR and go on to develop CKD.

Reflection — why is AKI potentially reversible while CKD is not? In AKI the nephrons are stunned or acutely injured, not gone — tubular cells can regenerate once the cause (low perfusion, toxin, obstruction) is removed. In CKD the nephrons are progressively destroyed and replaced by fibrous scar tissue, and nephrons do not regenerate. Treatment in CKD slows the loss; it does not restore it.

💬 Ask Claire: "Pretend you are my clinical instructor. Give me patients with AKI. Never tell me which type they have. I must determine whether the problem is prerenal, intrarenal, or postrenal using assessment findings, labs, and history. After each scenario, explain the pathophysiology like I'm learning it for the first time."

🩺 Clinical Corner

Students focus on the creatinine; experienced nurses focus on the patient. Is the patient making urine? Are they fluid overloaded? Can I hear crackles? Is the potassium dangerous? Is the heart at risk? The creatinine tells you how injured the kidney is — the assessment tells you how sick the patient is.

Unit 13 · Chronic Kidney Disease — The Kidneys Are Tired 🏭

100 workers in a factory. One quits, the other 99 work harder. Then another. Then another. Eventually there aren't enough workers left to run the factory. That is CKD.

Build the Story

Remember: CKD is progressive and irreversible — treatment slows progression, it does not cure. Definition: kidney damage or GFR <60 mL/min for 3 months or longer.

Why do people develop CKD? — which chronic diseases damage blood vessels?

• □ Diabetes — ✅ #1 cause. Chronic hyperglycemia thickens and scars the glomerular capillaries (diabetic nephropathy). Earliest sign: microalbuminuria.
• □ Hypertension — ✅ #2 cause. High pressure sclerose the small renal arterioles — and the damaged kidney then raises BP further, a vicious cycle.
• □ Lupus — ✅ Yes — lupus nephritis is immune-complex damage to the glomerulus
• □ Recurrent kidney infections — ✅ Yes — repeated pyelonephritis scars renal tissue permanently
• □ Polycystic kidney disease — ✅ Yes — the leading inherited cause; cysts replace functioning nephrons

🩺 Which two diseases cause MOST cases, and why? Diabetes and hypertension — together roughly two-thirds of all CKD. Both are diseases of the blood vessels, and the kidney is essentially a filter made of a million tiny blood vessels. Whatever damages vessels systemically damages nephrons. This is also why BP and glucose control are the two interventions that most slow CKD progression.

Stages of CKD — understand the trend

Nursing tip: the lower the GFR, the less filtration is occurring — and the more every drug dose needs rechecking, because the kidney is how most drugs leave the body.

Body System Challenge — CKD affects almost EVERY system. Why?

Clinical connection: a CKD patient often comes to the hospital for something other than their kidneys — heart failure, confusion, shortness of breath, weakness, or a fall. Ask: if the kidneys can't do their job, which body system will struggle next?

Pattern Recognition — complete the arrows

Unit 14 · Lab Detective — Can You Recognize CKD? 🧪

Patient A — Cr 0.9 · K⁺ 4.2 · Hgb 14 · GFR 98

Healthy? YES / NO YES — every value is within normal limits: creatinine 0.6–1.2, potassium 3.5–5.0, hemoglobin 12–16 g/dL (women) / 14–18 (men), GFR >90.

Patient B — Cr 4.9 · K⁺ 6.1 · Hgb 8.4 · phosphorus high · calcium low · GFR 11

What disease? Stage 5 chronic kidney disease (end-stage renal disease). GFR 11 with that full constellation — azotemia, hyperkalemia, anemia, hyperphosphatemia and hypocalcemia together — is the fingerprint of CKD, not of a single acute event.

Which Finding Worries You Most? — rank 1 (highest) to 5

• 1 — Potassium 6.4 (cardiac arrest risk in minutes — get an ECG)
• 2 — Calcium 7.8 (hypocalcemia → tetany, laryngospasm, seizures, prolonged QT — the second value with an acute neuromuscular/cardiac threat)
• 3 — Hemoglobin 8.5 (impairs oxygen delivery now; symptomatic, but treated over days–weeks with ESAs and iron)
• 4 — Creatinine 5.8 (tells you the severity of the disease; not directly dangerous)
• 5 — Phosphorus 6.2 (drives long-term bone disease and itching — a months-to-years problem; treat with binders taken WITH meals)

Explain your ranking: Rank by how fast the value can kill. Electrolytes that change cardiac membrane excitability come first (potassium, then calcium), then oxygen-carrying capacity, then markers of severity, then chronic complications.

The Nursing Process — what will you monitor every shift?

• ☐ Weight — ✅ Best single fluid indicator — same scale, same time, after voiding
• ☐ Lung sounds — ✅ Crackles are the earliest sign that overload reached the alveoli
• ☐ Intake/output — ✅ Guides the fluid restriction and shows whether they are still making urine
• ☐ Potassium — ✅ The lab with the shortest fuse
• ☐ Blood pressure — ✅ Both cause and consequence of kidney damage; control slows progression
• ☐ Mental status — ✅ New confusion = rising uremic toxins, or a dangerous electrolyte shift
• ☐ Skin — ✅ Itching, dryness, bruising and breakdown; edematous skin tears easily
• ☐ Edema — ✅ Grade and locate; check the sacrum in bedbound patients, not just ankles

Why are daily weights one of the BEST assessments in CKD? Because 1 kg of weight change = 1 liter of fluid, and weight detects fluid shifts before edema is visible or crackles are audible. I&O records get missed and edema grading is subjective — a scale is not. A 2–3 kg overnight gain is fluid, not fat.

Mini Concept Map

Clinical Judgment Case — Mr. Lopez, dialysis tomorrow

Weight ↑4 kg since last treatment · BP 192/102 · bibasilar crackles · +3 edema · K⁺ 6.3 · SpO₂ 90%

• Q1 — What concerns you MOST? Two findings are competing: the potassium of 6.3 and the SpO₂ of 90% with crackles. Assess the breathing first (ABCs — sit him up and give oxygen), but the potassium is the finding that will kill him fastest, so get the ECG and call immediately. Both point to the same answer: he needs dialysis today, not tomorrow.
• Q2 — What complication is developing? Fluid volume overload with pulmonary edema (4 kg = ~4 L retained), plus severe hyperkalemia — the classic missed-or-inadequate-dialysis picture.
• Q3 — What order would you anticipate? Urgent/emergent hemodialysis — it removes the fluid and the potassium at the same time. Also expect oxygen, IV calcium gluconate + insulin/dextrose to buy time on the potassium, and possibly IV furosemide if he still makes urine.
• Q4 — He reports chest pain and telemetry shows peaked T waves. Immediate priority? Stay with the patient, put him on continuous cardiac monitoring, and get IV calcium gluconate per order first — it does not lower the potassium, it stabilizes the cardiac cell membrane so the heart survives long enough for the other treatments to work. Then insulin + dextrose (and/or albuterol) to shift K⁺ into cells, then dialysis to remove it. Have the code cart nearby.

💬 Ask Claire: "I'm studying chronic kidney disease. Give me one patient at a time and make me identify which body systems are being affected. Ask me WHY each symptom occurs instead of asking me to memorize lists."

💙 Clinical Corner

Crackles? → fluid overload. Anemia? → no erythropoietin. Weak bones? → no active vitamin D. Peaked T waves? → hyperkalemia. Confusion? → waste products building up. Itching? → uremic waste in the skin. Stop memorizing symptoms; connect each one back to a lost kidney function.

Unit 15 · Dialysis — When the Kidneys Can't Do Their Job Anymore 🩸

Dialysis does not fix the kidneys. It takes over some of their jobs — not all of them.

What can dialysis actually do?

🩺 Why does a dialysis patient still have anemia? Because dialysis is a filter, not an organ. It can subtract things from the blood but it cannot secrete erythropoietin, so the marrow still gets no signal. Blood loss in the dialyzer circuit and frequent lab draws make it worse.

Why might they still have weak bones? Same reason — dialysis cannot activate vitamin D. Without calcitriol, calcium is not absorbed, PTH stays elevated, and bone keeps being resorbed (renal osteodystrophy).

Fill in the Comparison

Clinical Reasoning — who benefits from peritoneal dialysis?

• □ Lives several hours from a dialysis center — ✅ PD is done at home, so no thrice-weekly travel
• □ Wants more independence — ✅ Self-managed, flexible schedule, fewer dietary restrictions
• □ Has severe cardiovascular instability — ✅ The slow, continuous fluid removal avoids the abrupt volume shifts and hypotension that hemodialysis causes — much better tolerated by an unstable heart

⚠️ Who should NOT get PD? Patients with extensive abdominal adhesions or prior extensive abdominal surgery, active abdominal infection or peritonitis, hernias, severe obesity, or anyone who cannot maintain sterile technique at home.

Unit 15b · Peritoneal Dialysis — What Should Normal Look Like? 🚨

⚠️ Warm the dialysate with a dry heating pad or warmer — never in a microwave. Cold fluid causes pain and cramping; overheated fluid burns the peritoneum.

⛔ STOP — the dialysate suddenly becomes cloudy

• First thought? PERITONITIS — cloudy effluent is the earliest and most reliable sign, and it usually appears before the fever.
• Why is this an emergency? The peritoneum is a huge, highly vascular surface with a catheter running straight into it from the outside. Infection there spreads to the bloodstream fast (sepsis), and repeated episodes scar the membrane so PD stops working permanently. Send effluent for cell count, Gram stain and culture, then give antibiotics — often added directly into the dialysate.

Recognizing Peritonitis — circle every finding that concerns you

• □ Fever — ✅ Systemic infection
• □ Cloudy drainage — ✅ The hallmark and the earliest sign
• □ Clear yellow drainage — ❌ That is the normal, expected finding
• □ Abdominal pain — ✅ Diffuse pain with rebound tenderness — the peritoneum is inflamed
• □ Chills — ✅ Rigors point to bacteremia
• □ Redness around catheter — ✅ Exit-site infection — the usual doorway for peritonitis
• □ Bloody drainage — ✅ Concerning after the first few post-insertion exchanges — report it

🩺 Which finding should you report FIRST? The cloudy dialysate with abdominal pain — together they are diagnostic of peritonitis, and they show up before the patient looks septic. Report immediately and send the effluent for culture.

Unit 15c · Hemodialysis & Vascular Access — Your Lifeline 🩸

Without vascular access, there is no dialysis.

Match the Access Device

Assessment Detective — your patient has an AV fistula

• I should FEEL a THRILL — a buzzing/purring vibration under your fingertips (palpate)
• I should HEAR a BRUIT — a swishing, whooshing sound with the bell of the stethoscope (auscultate)
• What if they're missing? The access is clotted or occluded. Also check for a cool, pale, numb or painful hand distal to the fistula — that is steal syndrome, where the fistula is diverting blood away from the hand.
• What does no thrill mean? Blood is not flowing through the fistula — it has thrombosed. Without it, the patient has no way to receive dialysis.
• What should the nurse do? Notify the provider/dialysis team immediately — a clotted access is a time-sensitive problem; declotting or thrombectomy may still save it. Meanwhile protect the arm: no BP, no sticks, no constriction, and document the exact time you last felt a thrill.

❌ Protect the Access! — circle ALL actions that are NOT allowed

• Blood pressure on that arm — 🚫 NOT ALLOWED — the cuff compresses the fistula and can clot it
• IV insertion in that arm — 🚫 NOT ALLOWED — punctures introduce infection and damage the vessel
• Blood draws from that arm — 🚫 NOT ALLOWED — same reason; use the other arm
• Palpate for thrill — ✅ Allowed — required, in fact, every shift
• Listen for bruit — ✅ Allowed — also required every shift
• Sleep on the access arm — 🚫 NOT ALLOWED — hours of body weight on it can occlude it
• Carry heavy groceries with that arm — 🚫 NOT ALLOWED — heavy lifting and pressure compromise flow
• Wear tight clothing or jewelry on that arm — 🚫 NOT ALLOWED — anything constricting, including a watch or tight sleeve

Explain WHY: Anything that compresses, punctures, or constricts the access can clot it — and if the access clots, the patient loses the treatment that keeps them alive. Post a sign at the bedside and teach the patient to check their own thrill daily.

Before Dialysis — check all that apply

• ☐ Weight — ✅ Pre-weight vs. dry weight determines how much fluid to pull off
• ☐ Blood pressure — ✅ Baseline for detecting the hypotension that fluid removal causes
• ☐ Potassium — ✅ Drives urgency and dialysate composition
• ☐ Medication list — ✅ Some drugs must be held; some must be redosed after
• ☐ Lung sounds — ✅ Baseline volume status
• ☐ Access site — ✅ Thrill, bruit, and signs of infection — no access, no treatment

• Which medications are commonly held before dialysis? Antihypertensives (and often other BP-lowering drugs), plus water-soluble medications that dialysis will simply remove — many antibiotics, water-soluble vitamins, and digoxin needs special attention.
• Why? Dialysis itself drops the blood pressure by pulling off several liters of fluid. Giving an antihypertensive first stacks two BP-lowering effects and causes symptomatic hypotension mid-treatment. And any drug that crosses the dialyzer is being thrown away — the patient gets no therapeutic benefit, so those doses are given after the run.

During Dialysis — the blood pressure suddenly drops

• Why might this happen? Fluid is being removed from the vascular space faster than it can refill from the tissues → hypovolemia. Made worse by taking antihypertensives beforehand, eating during treatment (blood shunts to the gut), too aggressive an ultrafiltration goal, or an inaccurate dry weight. Also consider bleeding from the access and, rarely, a transfusion-type or air-embolism reaction.
• What assessment should you perform FIRST? Recheck the blood pressure and assess the patient's level of consciousness and symptoms (dizziness, nausea, cramping, pallor, diaphoresis). Then lower the head of the bed / Trendelenburg, slow or stop ultrafiltration, and give a normal saline bolus per protocol to restore volume.

After Dialysis — what do you expect?

Nursing priority — the FIRST thing you assess after dialysis? Vital signs, especially blood pressure, plus weight — hypotension from rapid fluid removal is the most common post-dialysis complication. Then check the access site for bleeding (they were heparinized) and confirm the thrill and bruit are still present. Hold pressure, do not massage, if the site oozes.

Complications — match the complication to its cause

⛔ STOP & THINK — nausea → headache → confusion during dialysis

• What complication comes to mind? Dialysis disequilibrium syndrome. The classic progression is nausea → headache → restlessness → confusion → twitching → seizures. Most common during the first few treatments or when the BUN was very high.
• Why is this dangerous? It is cerebral edema. Urea leaves the blood quickly but lingers in brain tissue, so water is pulled into brain cells. Untreated it progresses to seizures, coma and death. Slow or stop the dialysis and notify the provider now.

Clinical Judgment Case — Mr. Adams returns from dialysis

BP 88/52 · HR 112 · dizzy · weight down 3 kg · AV fistula dressing dry

• Q1 — Why is his blood pressure low? Three liters of fluid were removed from his vascular space in a few hours (3 kg = 3 L). The intravascular volume dropped faster than fluid could shift back in from the tissues → hypovolemia, with the HR of 112 as the compensation.
• Q2 — What should the nurse do FIRST? Lie him flat and elevate his legs (or place in Trendelenburg) — it returns blood to the central circulation immediately and costs nothing. Then recheck BP and HR, keep him in bed, and notify the provider; anticipate a small normal saline bolus and reevaluation of his dry weight.
• Q3 — Should he stand up quickly? YES / NO NO. He is hypovolemic and orthostatic — standing quickly will drop his cerebral perfusion and cause syncope and a fall. Change positions slowly, dangle first, and assist with ambulation; fall precautions are on.

Compare These Patients — rank 1 (highest priority) to 4

• Patient D — K⁺ 6.8 with peaked T waves awaiting dialysis. #1 — lethal dysrhythmia possible within minutes; the ECG proves the heart is already affected.
• Patient A — Cloudy PD drainage, temp 101.9°F. #2 — peritonitis heading toward sepsis; needs cultures and antibiotics within the hour.
• Patient C — BP 86/48 after dialysis, dizzy when upright. #3 — a real perfusion problem and a fall risk, but it responds immediately to positioning and fluid.
• Patient B — No thrill over AV fistula. #4 — urgent (the access may be lost and dialysis delayed), but it is not killing anyone in the next ten minutes.

Reasoning: Rank by ABCs and by what kills fastest: a lethal rhythm now > an infection becoming sepsis in hours > hypotension that you can fix at the bedside > loss of access that threatens the next treatment. Note: if the fistula question is asked alone with stable patients, the clotted fistula IS the answer — it only drops here because there are sicker patients on the list.

💬 Ask Claire: "I am learning dialysis in nursing school. Act like my clinical instructor. Give me one dialysis patient at a time and make me identify the priority assessment, the complication, and the first nursing intervention. Do not tell me the answer until I explain my reasoning."

⭐ Exam Tip

Dialysis is not the answer to every problem. Sometimes the patient needs emergency treatment for hyperkalemia before dialysis, antibiotics for peritonitis, fluids after dialysis hypotension, or immediate evaluation of a nonfunctioning fistula. Assess the patient first, name the complication, then ask what could harm them fastest.

Unit 16 · Renal Transplantation 🫱

A transplant is life-changing — but it is not a cure. The body sees the new kidney as foreign and will try to attack it.

⛔ Stop & Think

• If your immune system attacks the new kidney, what is this called? Rejection. Hyperacute occurs within minutes to 48 hours (the organ must be removed); acute occurs within about the first week to 3 months and is often treatable; chronic occurs over months to years and gradually destroys the graft.
• How do we prevent it? Careful donor–recipient matching (ABO and HLA, plus a crossmatch) and lifelong immunosuppressant therapy — typically a calcineurin inhibitor (cyclosporine or tacrolimus) + an antiproliferative (mycophenolate) + a corticosteroid.

Build the Story

What if they stop taking them? The immune system reactivates and rejects the graft — the kidney fails and the patient goes back on dialysis, having burned a scarce organ. Nonadherence is one of the leading causes of late graft loss, so assess for cost barriers, side effects (hirsutism, gum overgrowth, tremor, weight gain, mood changes) and understanding at every visit.

Nursing Priorities after Kidney Transplant — check them off

• ☐ Monitor urine output — ✅ The #1 indicator of graft function. Hourly at first; a sudden decrease is an early sign of rejection or of obstruction/thrombosis.
• ☐ Monitor for infection — ✅ Immunosuppression makes infection the leading cause of death after transplant — and the signs are blunted
• ☐ Encourage medication adherence — ✅ Lifelong, on schedule, never skipped — missed doses cost the kidney
• ☐ Teach low-sodium diet — ✅ Supports blood pressure control and protects the new kidney (steroids also cause sodium retention)
• ☐ Assess incision — ✅ Steroids and immunosuppressants delay healing and mask redness; watch for dehiscence and leakage
• ☐ Encourage incentive spirometer — ✅ Prevents atelectasis and pneumonia — a critical concern when the immune system is suppressed
• ☐ Monitor creatinine — ✅ A rising creatinine is one of the earliest laboratory signs of rejection
• ☐ Monitor temperature — ✅ Even a low-grade fever is significant — it may mean rejection or infection, and both are emergencies here

Why Are Transplant Patients So Vulnerable?

• Immunosuppressants decrease the body's ability to mount an immune response — to recognize and fight invading organisms and abnormal cells
• This places the patient at risk for infection (bacterial, viral — CMV, BK virus, herpes — and fungal), reactivation of latent infections such as TB, and long-term malignancy, especially skin cancer and lymphoma. Teach: avoid crowds and sick contacts, meticulous hand hygiene, no live vaccines, food safety, daily sunscreen, and report ANY fever right away.

💊 Medication Connection — Cyclosporine

Teach the client to avoid:

• ☐ Milk — ❌ Not a concern
• ☐ Grapefruit juice — ✅ AVOID.
• ☐ Bananas — ❌ Not related to cyclosporine (relevant to potassium counseling instead)
• ☐ Cranberry juice — ❌ Not a concern for this drug

Why? Grapefruit inhibits the CYP3A4 enzyme that metabolizes cyclosporine, so drug levels climb into the toxic range → nephrotoxicity, hepatotoxicity, tremor, hypertension and severe over-immunosuppression. The same warning applies to tacrolimus. Also teach: take at the same time every day, do not skip doses, expect gum overgrowth (see the dentist and brush meticulously) and hirsutism, and have trough levels drawn as ordered.

💬 Ask Claire: "Help me care for a kidney transplant patient. Give me realistic postoperative scenarios and ask me to identify signs of rejection, infection, medication complications, and priority nursing interventions."

Unit 17 · Polycystic Kidney Disease — When Cysts Replace Healthy Kidneys 🧬

Not an infection. Not a lifestyle disease. It is inherited — most commonly autosomal dominant, so each child of an affected parent has a 50% chance.

Big Picture

What Makes PKD Different?

• As cysts grow they squeeze the tiny vessels inside the kidney. What happens when blood flow decreases? The juxtaglomerular cells sense low renal perfusion — exactly as they would in hemorrhage — and switch on the RAAS.
• So the kidneys release: RENIN → angiotensin I → (ACE) angiotensin II, a potent vasoconstrictor → aldosterone, which retains sodium and water; ADH is released too.
• What happens next? Blood pressure RISES — and the hypertension then damages the remaining nephrons, which further reduces perfusion, which releases more renin. A self-feeding loop.

⭐ Clinical Tip: the hypertension in PKD is not stress — it is RAAS activation caused by cysts compressing renal blood vessels, and it is one of the most tested concepts in this unit.

Pattern Recognition

Which Pain Is It?

• Dull, aching flank pain — Chronic pain from enlarging cysts stretching the renal capsule. Expected; managed with heat and non-nephrotoxic analgesia.
• Sharp, severe flank pain — Something acute: a ruptured cyst, a kidney stone, or an infected cyst. Look for new hematuria, fever, and hypotension — and report it.

🩺 Why is blood pressure the MOST important thing to monitor in PKD?

Because controlling blood pressure is the one intervention that measurably slows the loss of kidney function. Uncontrolled hypertension accelerates nephron destruction, and PKD patients also carry a high rate of cerebral (berry) aneurysms — a hypertensive crisis can rupture one. So BP control protects both the kidneys and the brain. ACE inhibitors/ARBs are first line.

Nursing Priorities — rank highest to lowest

• 1 — Monitor blood pressure (the intervention that changes the disease trajectory and prevents aneurysm rupture)
• 2 — Monitor renal labs (creatinine, BUN, GFR, K⁺ — detects decline and dangerous electrolytes)
• 3 — Assess pain (comfort, and a change in the pain pattern signals rupture, stone or infection)
• 4 — Monitor daily weights (fluid status as function declines)
• 5 — Encourage low-sodium diet (essential long-term teaching that supports BP control — but teaching ranks below monitoring an unstable parameter)

Reasoning: Assessment and monitoring of the parameter that can cause acute harm come before comfort measures, and long-term teaching always ranks last on a priority list.

🚨 Clinical Judgment — worsening headaches, blurred vision, BP 198/112

• What complication concerns you most? A hypertensive emergency — and specifically, in PKD, rupture of a cerebral (berry) aneurysm or hypertensive encephalopathy/stroke. Headache + visual changes + a diastolic over 110 is end-organ damage in progress.
• What should the nurse do FIRST? Notify the provider immediately and prepare for rapid, controlled BP reduction. Because this pressure is actively damaging the brain, eyes and kidneys right now. Meanwhile: keep the patient quiet with the head of bed elevated, do a neuro check, recheck the BP in both arms, and have seizure precautions and IV access ready.

💬 Ask Claire: "Help me understand polycystic kidney disease by connecting every symptom back to the growing cysts. Quiz me on why blood pressure control is the highest priority and how untreated hypertension accelerates kidney damage."

Unit 17 (continued) · PKD Deep Dive 🎈

Blowing up balloons inside a sponge. At first the sponge still works — but as more balloons grow, there isn't much sponge left.

Build the Story

⛔ Stop & Think — is PKD acute, chronic, congenital, or infectious?

• ☐ Acute — ❌ It develops over decades, not hours
• ☐ Chronic — ✅ Yes — slowly progressive and irreversible
• ☐ Congenital — ✅ Yes — the genetic defect is present from birth (inherited), even though symptoms usually appear in the 30s–40s
• ☐ Infectious — ❌ Not caused by an organism — though cysts can become infected as a complication

🩺 PKD develops over many years. Why don't patients get sick immediately? Because the kidney has enormous reserve. The undamaged nephrons hyperfiltrate and compensate, so labs and blood pressure stay normal until roughly half of function is gone. Symptoms typically surface between ages 30 and 40, and the first sign is usually hypertension — which is why family screening and early BP control matter so much.

Why Is Blood Pressure So Important? — complete the pathway

Clinical connection — why is BP control the top nursing priority? Because it is the only modifiable factor that slows the disease. Every year of uncontrolled hypertension destroys nephrons faster and moves the patient closer to dialysis, and it also raises the risk of rupturing a cerebral aneurysm. Think of hypertension as fuel on the fire.

Recognizing the Patient — check each expected finding

• ☐ Flank pain — ✅ Dull and chronic from capsular stretch
• ☐ Enlarged abdomen — ✅ Bilaterally palpable, massively enlarged kidneys
• ☐ Hypertension — ✅ Usually the earliest sign of all
• ☐ Bloody urine — ✅ Gross or microscopic hematuria from cyst rupture
• ☐ Kidney stones — ✅ Common — urinary stasis and concentrated urine
• ☐ Constipation — ✅ Yes — the enlarged kidneys physically press on the bowel
• ☐ Progressive fatigue — ✅ From rising uremic toxins and anemia as function declines
• ☐ Frequent hypoglycemia — ❌ Not a feature of PKD. (Late kidney disease actually reduces insulin clearance, but hypoglycemia is not a recognized PKD finding.)

Extra-renal cysts and complications to know: liver cysts (most common), plus pancreatic and splenic cysts, cerebral berry aneurysms, mitral valve prolapse, and colonic diverticula.

Which Pain Is It? — part two

• "My side has been aching for weeks." — ☐ Enlarging cysts ☐ Ruptured cyst ✅ Enlarging cysts. Weeks of dull, gradual aching = slow capsular stretch. A rupture is sudden, not gradual.
• "It feels like someone stabbed me in my back." — ☐ Enlarging kidney ☐ Ruptured cyst ☐ Kidney stone ✅ Ruptured cyst or a kidney stone — both cause abrupt, severe pain. Sort them out with the pattern: a stone is colicky and radiates to the groin and the patient cannot sit still; a rupture is more constant flank pain with new gross hematuria. Either way, assess for bleeding, hypotension, fever and urine output, and notify the provider.

Build the Table — quick recall

⛔ STOP — your PKD patient's BP is 198/108. Just document it?

• YES / NO NO. Never document a pressure like this and walk away.
• Explain WHY. 198/108 is a hypertensive crisis in a patient who already has fragile renal vessels and an elevated risk of cerebral aneurysm. It is actively destroying nephrons and could cause a hemorrhagic stroke. Recheck manually, do a quick neuro and visual check, ask about headache/chest pain, look for missed antihypertensive doses, and notify the provider now.

Nursing Priorities — rank 1 to 6

• 1 — Monitor blood pressure (the parameter that can kill and the one that changes outcomes)
• 2 — Monitor renal labs (objective progression data + dangerous electrolytes)
• 3 — Assess pain (comfort, and a change in pattern signals an acute complication)
• 4 — Monitor daily weights (fluid status as GFR falls)
• 5 — Encourage a low-sodium diet (supports BP control — teaching)
• 6 — Teach home blood pressure monitoring (vital for the long haul, but the least urgent thing on this shift)

Why is your top priority first? Because blood pressure is both the most immediately dangerous parameter and the one nursing intervention proven to slow progression to dialysis. Everything below it either measures the damage or supports the BP goal.

💊 Medication Connection — the provider prescribes an NSAID for chronic flank pain

• Should the nurse question this order? YES / NO YES — question it.
• Why? NSAIDs are nephrotoxic. They block prostaglandins that keep the afferent arteriole dilated, so renal blood flow drops — exactly what a PKD kidney cannot afford — and they raise blood pressure and cause sodium retention. In a patient whose whole treatment plan is "protect perfusion and control BP," an NSAID works against both. Acetaminophen is the preferred analgesic in kidney disease.

Clinical Judgment — Mr. Ramirez, 48, PKD

BP 188/104 · dull bilateral flank pain · abdominal fullness · creatinine 2.8 mg/dL · bloody urine

• Q1 — Which finding concerns you MOST? The BP of 188/104. It is the only finding that can cause an acute catastrophe (stroke, aneurysm rupture) and it is the one accelerating everything else. The flank pain, fullness and hematuria are expected in PKD.
• Q2 — Greatest long-term risk? Progression to end-stage kidney disease requiring dialysis or transplant — typically by age 50–60, and sooner if the hypertension stays uncontrolled. His creatinine of 2.8 says he is already well into CKD.
• Q3 — What intervention comes FIRST? Address the blood pressure — recheck it, review whether antihypertensives were taken, and notify the provider for orders. Because BP control is the intervention that protects the remaining nephrons and prevents an acute neurologic event.
• Q4 — What additional assessment shows whether function is still declining? Trend the serum creatinine and calculated GFR over time (the single best indicator), alongside BUN, potassium, hemoglobin, urine protein, daily weight and urine output.

Mini Concept Map

🧠 Stop & Connect — look back at every renal disorder so far

💬 Ask Claire: "I am learning Polycystic Kidney Disease in nursing school. Give me patient scenarios and ask me to explain WHY each symptom occurs. Focus especially on hypertension, RAAS activation, kidney enlargement, and progressive kidney failure. Do not tell me the diagnosis until I have explained my reasoning."

Unit 18 · Renal Calculi — When Urine Stops Flowing 🪨

A pebble in a garden hose. Water may still flow at first — but as it moves it scrapes, pressure builds behind it, and the pain becomes intense.

💙 the tip: the pain is not the stone sitting in the kidney — it is the stone MOVING and blocking flow, making the ureter spasm.

Build the Story

⛔ Why do we push fluids? Dilute urine keeps minerals in solution so they cannot crystallize, and the volume helps flush an existing stone downstream. Target roughly 2.5–3 L/day unless the patient is fluid restricted — enough that the urine stays pale and clear.

🩺 What nursing interventions help a small stone pass? Generous fluids, ambulation (gravity and movement help it travel), effective pain control and antiemetics so the patient can stay hydrated and moving, warm/moist heat to the flank for spasm, and straining every void. Expect an alpha blocker such as tamsulosin to relax ureteral smooth muscle and speed passage.

Recognizing the Patient — check every expected finding

• ☐ Severe flank pain — ✅ Sudden, excruciating, unilateral — often rated 10/10
• ☐ Pain that comes in waves — ✅ Colicky — matching the waves of ureteral peristalsis
• ☐ Nausea and vomiting — ✅ Shared nerve pathways between kidney/ureter and GI tract
• ☐ Hematuria — ✅ The stone abrades the urothelium — usually microscopic, sometimes gross
• ☐ Restlessness — ✅ Classic — they pace and writhe, unable to find any comfortable position
• ☐ Pallor — ✅ Sympathetic response to severe pain
• ☐ Diaphoresis — ✅ Same sympathetic surge
• ☐ Bradycardia — ❌ No — expect TACHYcardia. Severe pain drives the heart rate up.
• ☐ Dysuria — ✅ Especially once the stone reaches the ureterovesical junction near the bladder
• ☐ Tachycardia — ✅ Yes — along with hypertension, from pain

Clinical connection — why can't they sit still? Renal colic is visceral pain from a spasming, distended ureter, and no position relieves it — so the patient keeps moving looking for one. Compare this with peritonitis, where movement stretches the inflamed peritoneum and makes the pain worse, so those patients lie perfectly still with their knees drawn up. Writhing = stone. Frozen still = peritonitis.

Pain Detective — match the pain to the stone's location

Build the Table

⛔ STOP — your patient suddenly stops producing urine

• What complication concerns you? Complete obstruction → hydronephrosis and postrenal AKI. In a patient with one functioning kidney, or with bilateral stones, anuria means total obstruction.
• Why is this an emergency? Urine backs up, the renal pelvis distends, and the pressure crushes the nephrons from the inside. Permanent damage begins within hours to a few days, and stagnant obstructed urine above an infection becomes urosepsis, which is rapidly fatal. Notify the provider immediately — the obstruction has to be relieved (stent or percutaneous nephrostomy), and no amount of pain medication fixes it.

Diagnostics

🩺 Urinalysis shows microscopic hematuria. Surprised? YES / NO NO — expected in roughly 85–90% of patients with stones, because the stone abrades the urothelium as it moves. (Its absence does not rule a stone out.)

Nursing Priorities — number these in order

• 1 — Assess pain (assess before you intervene — and a sudden change in the pain tells you the stone moved or something ruptured)
• 2 — Administer prescribed analgesics (renal colic is one of the most severe pains in medicine; pain control is the priority intervention)
• 3 — Administer antiemetics (vomiting worsens dehydration and prevents oral fluids and meds)
• 4 — Strain all urine (every void, every time — a missed fragment means no stone analysis and no prevention plan)
• 5 — Encourage oral fluids (if appropriate) (possible once nausea is controlled; helps flush the stone)
• 6 — Encourage ambulation (helps the stone move — but only when pain and nausea are managed enough to walk)

Why is straining the urine important? Two reasons. It confirms the stone passed (so you know the obstruction is relieved), and the stone is sent for analysis — its composition determines the whole prevention plan: the diet, the fluid goal, and whether the patient needs allopurinol, thiazides or potassium citrate. Teach the patient to strain every void, at home too.

💊 Medication Connection — greatest immediate effect in renal colic?

• ☐ Acetaminophen — ❌ Too weak for renal colic and no anti-inflammatory or antispasmodic effect
• ☐ Ketorolac — ✅ Yes. An IV NSAID that reduces prostaglandin-mediated ureteral spasm and inflammation and lowers renal pelvic pressure — it treats the actual mechanism, not just the perception of pain. It works as well as or better than opioids for colic. Caution: short-term use only (≤5 days), and hold it if the patient has renal impairment, is bleeding, or is on anticoagulants; opioids are used when NSAIDs are contraindicated.
• ☐ Calcium carbonate — ❌ An antacid/calcium supplement — could contribute to stone formation, not treat it
• ☐ Ferrous sulfate — ❌ An iron supplement; no role here and it causes constipation

Clinical Judgment — Mr. Carter in the ED

Sudden severe right flank pain radiating to groin · restless · BP 170/94 · HR 118 · pink urine · nauseated

• Q1 — Priority hypothesis? Renal calculus with a stone moving down the right ureter (renal colic).
• Q2 — Which finding best supports it? The sudden severe flank pain radiating to the groin combined with restlessness — that pattern is nearly unique to a moving stone. The pink urine (hematuria) confirms it. Note the absence of fever, which argues against pyelonephritis.
• Q3 — Which intervention comes FIRST? Give the prescribed analgesic (typically IV ketorolac and/or an opioid) — after a quick pain assessment. Pain control is the priority because the pain itself is driving his BP of 170/94 and HR of 118, and he cannot tolerate fluids, ambulate, or cooperate with anything until it is treated.
• Q4 — What complication are you monitoring for? Complete obstruction → hydronephrosis and postrenal AKI, and infection behind the obstruction → urosepsis. Watch urine output hourly, temperature, and for a sudden change in pain or a drop in blood pressure.

Therapeutic Procedure — ESWL (Extracorporeal Shock Wave Lithotripsy)

Shock waves break the stone into fragments small enough to pass — the stone is not removed.

Before the procedure — check all that apply

• ☐ Obtain informed consent — ✅ It is an invasive procedure — the provider explains, the nurse witnesses and confirms understanding
• ☐ Monitor vital signs — ✅ Baseline for comparison afterward
• ☐ Explain the procedure — ✅ Reduces anxiety; describe the loud thumping, the positioning, and the sedation/anesthesia
• ☐ Review allergies — ✅ Contrast, anesthetics and antibiotics may all be used
• ☐ Also: ✅ Hold anticoagulants as ordered, confirm there is no active UTI or pregnancy, and give preprocedure antibiotics if prescribed

After the procedure — which findings are EXPECTED?

• ☐ Mild bruising — ✅ Expected over the treatment site — the shock waves pass through skin and muscle
• ☐ Blood in the urine — ✅ Expected — pink/blood-tinged urine for a few days as fragments abrade the tract
• ☐ Passage of small stone fragments — ✅ Expected, and it is the goal — may continue for days to weeks
• ☐ Severe uncontrolled bleeding — ❌ NOT expected — report immediately (possible perinephric hematoma)
• ☐ No urine output — ❌ NOT expected — report immediately; fragments may be obstructing the ureter (“steinstrasse”)

⛔ Why keep straining urine after ESWL? Because the stone was fragmented, not removed — the pieces still have to pass, over days to weeks. Straining confirms they are coming out and captures them for analysis so the provider can prescribe the right prevention plan.

Complications

Diet Detective — different stones, different diets

🩺 Why is telling every patient to "avoid calcium" incorrect? Because it can make stones worse. Most stones are calcium oxalate, and the culprit is oxalate, not calcium. Calcium eaten with meals binds oxalate in the intestine so it is excreted in stool instead of urine. Cut the calcium and more free oxalate reaches the kidney — plus you have set up a patient with kidney disease for osteoporosis. Match the diet to the stone analysis; the universal advice is FLUIDS, not "no calcium."

💬 Ask Claire: "I am studying renal calculi in nursing school. Give me patients with flank pain, hematuria, urinary obstruction, and kidney stones. Help me determine the diagnosis, prioritize nursing interventions, and recognize complications such as hydronephrosis and urosepsis. Explain every rationale after I answer."

💙 Clinical Corner

With sudden severe flank pain, don't jump to "pain medication." Ask: Can urine still flow? Is the kidney becoming obstructed? Could this be hydronephrosis? Is there evidence of infection? What finding tells me they are getting worse? The stone isn't always the biggest problem — obstruction, urosepsis and loss of kidney function are.

Bonus · Benign Prostatic Hyperplasia 🚹

the workbook keeps using BPH patients as examples — here is the disorder itself, because it is the #1 cause of postrenal AKI on exams.

The exam link: BPH + can't void + distended bladder = postrenal AKI. The first intervention is always to relieve the obstruction.

💊 The Renal Drug Sheet — what it does, and what you monitor

🚨 Hyperkalemia Rescue — the one sequence to memorize

This shows up in AKI, CKD, dialysis and transplant questions. Learn the order once and it answers all of them.

ECG progression to recognize: tall peaked T waves → prolonged PR → flattened/absent P waves → widened QRS → sine wave → VF/asystole. Peaked T waves = act now.

Diet teaching — high-potassium foods to limit: bananas, oranges and orange juice, potatoes (including sweet potatoes), tomatoes and tomato sauce, spinach and other greens, avocado, melons, dried fruit, beans and legumes, nuts, milk, and salt substitutes (they are potassium chloride — the one people forget). Lower-potassium choices: white rice, pasta, bread, apples and applesauce, berries, grapes, green beans, cabbage, cauliflower.

Practice Test — 15 Questions ✅

Answer first, then open the rationale. The reasoning matters more than the letter.

Answer key: 1-B · 2-B · 3-B · 4-C · 5-D · 6-A,B,D,F · 7-D · 8-A · 9-C · 10-B · 11-A · 12-A,B,C,E · 13-B · 14-B · 15-A

ATI-Style Set — 10 Questions with Rationales 📝

3. Appropriate or Not Appropriate for a client receiving hemodialysis?

Rationale: The fistula is the patient's lifeline — protect it. No BP, no IVs, no blood draws, no constriction on that arm. Thrill and bruit confirm adequate blood flow.

6. Bow-tie — complete the diagram

Client with severe flank pain and hematuria. Choose the condition, two nursing actions, and two parameters to monitor.

• Condition: ✅ Renal calculi — severe flank pain with hematuria. (Not glomerulonephritis: no cola urine, edema or hypertension. Not nephrotic syndrome: no massive proteinuria or edema. Not cystitis: that is burning and frequency, not severe flank pain.)
• Nursing action 1: ✅ Administer prescribed opioid analgesics — renal colic is severe and pain control is the priority intervention
• Nursing action 2: ✅ Strain all urine — confirms passage and captures the stone for analysis
• Not chosen: ❌ Encourage ambulation (helpful later, not a top-two action); ❌ Restrict oral fluids (backwards — fluids are encouraged); ❌ Prepare for immediate dialysis (no indication); ❌ Insert an indwelling catheter (not routine for stones)
• Monitor 1: ✅ Pain level — evaluates the analgesia and flags a change in the stone's position
• Monitor 2: ✅ Urine output — detects obstruction, the complication you fear most

10. Bow-tie — AKI case

Vomiting and diarrhea 3 days · BP 84/46 · HR 118 · UOP 15 mL/hr · BUN 42 · Cr 2.9 · K⁺ 5.1

• Condition: ✅ Prerenal acute kidney injury — GI fluid losses → hypovolemia → hypotension → the kidney is not perfused. The BUN:creatinine ratio is about 14:1… but the history and hemodynamics are decisive, and prerenal ratios classically run >20:1. (Not intrarenal: no toxin or intrinsic disease. Not postrenal: no obstruction. Not CKD: this happened over 3 days.)
• Intervention 1: ✅ Administer prescribed IV fluids — restoring intravascular volume restores renal perfusion, and that is the whole treatment
• Intervention 2: ✅ Monitor intake and output — tells you whether perfusion is improving
• Not chosen: ❌ Restrict oral fluids (wrong direction — he is dry); ❌ High-protein diet (increases nitrogenous waste); ❌ Immediate dialysis (not indicated — fluids may fully reverse this); ❌ Potassium supplements (K⁺ is already 5.1 and rising)
• Monitor 1: ✅ Urine output — the earliest, most sensitive indicator that perfusion is restored (goal >0.5 mL/kg/hr or >30 mL/hr)
• Monitor 2: ✅ Blood pressure — the driving force behind glomerular filtration

Bow-Tie Questions 🎀

Bow-Tie #1

3 weeks of fatigue and swelling · BP 178/96 · periorbital edema · UOP 350 mL/24 hr · dark brown "cola-colored" urine · BUN 58 · Cr 3.2

• Condition: ✅ Acute glomerulonephritis. The four clues together are diagnostic: cola-colored urine + hypertension + oliguria + periorbital edema.
• Why not nephrotic syndrome? Students pick it because of the edema. But nephrotic syndrome produces foamy urine from massive proteinuria — not cola-colored urine from red blood cells. Blood leaking = GN. (Pyelonephritis would bring fever and CVA tenderness; renal calculi would bring severe colicky pain.)
• Nursing action 1: ✅ Monitor blood pressure closely — 178/96 risks stroke, encephalopathy and pulmonary edema
• Nursing action 2: ✅ Restrict sodium as prescribed — less sodium means less water retained, which lowers BP and edema
• Not chosen: ❌ Administer antibiotics (the strep infection is already gone — this is the immune aftermath); ❌ Encourage ambulation every hour (rest is indicated); ❌ Increase protein intake (raises nitrogenous waste in an azotemic patient); ❌ Strain all urine (that is for stones)
• Monitor 1: ✅ Urine output — the direct measure of whether GFR is recovering
• Monitor 2: ✅ Respiratory status — because fluid overload progresses to pulmonary edema, and that is what would kill this patient

Bow-Tie #2

Sudden severe LEFT flank pain radiating to the groin · restless, cannot get comfortable · nausea and vomiting · microscopic hematuria · temp 98.4°F

• Condition: ✅ Renal calculi. Sudden colicky flank pain radiating to the groin + restlessness + hematuria is the classic triad.
• Why not pyelonephritis? Two discriminators. (1) No fever — pyelonephritis presents with fever, chills and CVA tenderness. (2) He cannot hold still — colic makes patients writhe; infection and peritoneal irritation make patients lie motionless. (PKD gives chronic dull bilateral pain with hypertension; cystitis gives burning and frequency, not severe colic.)
• Nursing action 1: ✅ Administer prescribed analgesics — the priority; the pain is driving the vital signs
• Nursing action 2: ✅ Encourage oral fluids if not contraindicated — helps flush the stone and keeps urine dilute
• Not chosen: ❌ Broad-spectrum IV antibiotics (no fever, no evidence of infection); ❌ Prepare for dialysis (no renal failure); ❌ Warm moist heat (a comfort adjunct, but not one of the top two actions); ❌ Obtain daily weights (that is a fluid-overload intervention)
• Monitor 1: ✅ Pain level — evaluates the analgesic, and a sudden change signals the stone moved or the tract perforated
• Monitor 2: ✅ Urine output — falling output means obstruction → hydronephrosis → postrenal AKI

⭐ The pattern table — "If you see… think…"

⭐ Must-Not-Forget Strip — the eight things

The repetition is deliberate. If you read nothing else the morning of the exam, read this.

1. Potassium kills first. In every renal question, scan for K⁺ >5.0 and for peaked T waves. Sequence: calcium gluconate (protect) → insulin+D50/albuterol (shift) → dialysis or binder (remove).
2. Crackles beat everything except a lethal rhythm. Fluid in the alveoli is a breathing problem. Sit them up, oxygen, call — then diurese or dialyze.
3. Daily weight is the best fluid measure. 1 kg = 1 L. Same scale, same time, after voiding, same clothing.
4. Know the AKI flip. Oliguric phase: overload, HIGH potassium, RESTRICT fluids. Diuretic phase: deficit, LOW potassium, REPLACE fluids. Same patient, opposite orders.
5. Blood leaking vs. protein leaking. Cola urine + HTN + oliguria = glomerulonephritis. Foamy urine + massive edema + albumin <3 = nephrotic syndrome.
6. Protect the fistula. Feel the thrill, hear the bruit, every shift. No BP, no IVs, no blood draws, nothing tight on that arm. No thrill = call now.
7. Cloudy dialysate = peritonitis. It appears before the fever. Culture the effluent and notify immediately — this becomes sepsis.
8. Relieve obstruction first, and cover the classic clues. Distended bladder + BPH + rising creatinine → scan and catheterize. Painless hematuria → bladder cancer, get the cystoscopy. Colicky pain + restless → stone: analgesia, strain all urine. New confusion in an elder → UTI. PKD → blood pressure is the whole game.

And the one question behind all of it

What is the kidney failing to do — filter, balance fluid, balance electrolytes, balance acid, control blood pressure, or make red cells? Name the broken job, and the assessment findings, the priority, and the complication you are preventing all fall out of it.