Nursing Field Notes / Cardio · Pathophysiology Course

Heart Defect Types 🫀

NG-037 CARDIO ADHD-friendly visual edition

Congenital Heart Defects II. Every defect sorts into one of three buckets by which way the blood moves: RIGHT to left = hypoxia (blue baby), LEFT to right = CHF (heavy fluid), or a valve that is simply stenosed (obstructive). Pick the direction and the whole picture follows.

📄 Simple Nursing original — opens in Drive →

🚨 Starts with T = TROUBLETOF · TGA · Truncus · Tricuspid atresia = RIGHT to left = hypoxia.

💧 HF = Heavy FluidASD · VSD · PDA · AVSD = LEFT to right = CHF.

🧪 Hgb OVER 22 g/dLReport it — PRIORITY. Thick blood = clot risk.

💦 Priority = HydrationFor the blue (right→left) babies — thin the traffic jam.

🔵

BLUE

STEP 1 · RIGHT → LEFT · HYPOXIA

Blood skips the lungs and goes out unoxygenated — the MOST deadly & MOST tested group.

🔀 One question sorts every defect: which way does the blood shunt?

Orientation: the RIGHT heart is drawn on your left — like you're facing the patient. So forget left/right on the page and watch the colors: 🔵 blue crossing into red = right→left · 🔴 red crossing into blue = left→right.

TOF · TGA · Truncus · Tricuspid atresia

ASD · VSD · PDA · AVSD

🧠 “Right to left = the baby turns BLUE. Left to right = the lungs get WET.” One arrow decides the whole story.

⭐ Memory Trick — if it starts with T, then it's trouble NCLEX TIP

T - Trouble! — the RIGHT to left blood-flow defects:

T — Tetralogy of Fallot (TOF) ⭐
T — Transposition of the Great Vessels (TGA) ⭐
T — Truncus Arteriosus
T — Tricuspid Atresia

⭐ TOF & TGA are the 2 MOST tested. The whole group is the MOST deadly — low oxygen is always a priority on the NCLEX.

🧠 Four T's, one problem: they all take blood AWAY from the lungs and push it from the right → LEFT side of the heart → blue babies.

1️⃣ Tetralogy of Fallot (TOF) — 4 defects in 1 🚨

1 · Pulmonary valve — pinched, so less blood reaches the lungs
2 · Right ventricle
3 · Ventricular septal defect — the hole blue blood crosses through
4 · Aorta — sits over the hole, so it carries blue blood out

🧠 “TROUBLE!” — TOF is the poster child of the T's. 4 defects, 1 heart: Pulmonary valve · Right ventricle · VSD · Aorta = “Poor Ricky's Very Anxious” heart.

2️⃣ Transposition of the Great Vessels (TGA) 🔄

The great vessels have traded places: the aorta leaves the RIGHT ventricle and the pulmonary artery leaves the LEFT ventricle. Blue blood is launched straight back OUT to the body.

🧠 TGA = “The Great swAp.” The vessels are on the wrong ventricles — plumbing crossed at birth.

3️⃣ Truncus Arteriosus 🌳

One single trunk leaves the heart where two separate vessels belong — so lung blood and body blood come out of the same pipe. Another T that steals oxygen.

🧠 TRUNK = one tree, two branches. If there's only one trunk, nothing gets a clean, separate supply.

4️⃣ Tricuspid Atresia ⛔

The tricuspid valve has no opening, so blood can't take the normal road from RA → RV. It detours across to the LEFT side instead — right to left again.

🧠 A-tresia = Absent opening. The door between RA and RV is bricked shut, so the blood takes the shortcut to the left.

🚨 Signs & symptoms — the blue baby NCLEX TIP

🫐 Cyanosis
blue skin

🍼 Poor feeding & weight gain

🖐️ Clubbing fingers

💨 Dyspnea & Tachypnea

🩸 Polycythemia
too many red blood cells

🧊 Blood clot risk!

Hypoxia (low O₂) comes from RIGHT to left blood flow — there is decreased blood flow to the lungs, so it results in oxygen problems.

🧠 “Blue Babies Can't Do Push-ups” — Blue skin (cyanosis) · Bad feeding & weight gain · Clubbing · Dyspnea/tachypnea · Polycythemia.

🧠 Complication: the delayed STROKE

🫁 Hypoxia (low O₂)

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😱 Body says “OHHH SNAP! I better make more oxygen carriers.”

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🔴 A lot of red blood cells are created to compensate = polycythemia

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🚗 Instead of perfusing the body, the extra RBCs cause a traffic jam — thick, viscous blood

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🧠 Clogs the tiny vessels in the brain → deadly blood clot → delayed stroke!

🧠 More carriers ≠ more oxygen. The fix for a traffic jam isn't more cars — it's water to keep the lanes moving.

🧪 Report Hemoglobin OVER 22 g/dL NCLEX TIP

Report Hemoglobin level OVER 22 g/dL — this is PRIORITY & must be reported to the health care provider!

🩸 Why so high? Polycythemia — the hypoxic body builds extra oxygen carriers, so the Hgb climbs and the blood turns thick & viscous. ⚠️ Blood clot risk!

🧠 “Over 22 = the blood is GLUE.” Glue clots — so you report it.

💦 Priority intervention = HYDRATION ✅ NCLEX TIP

💧 Hydration — the priority intervention for the right→left (hypoxia) defects

🧪 Report Hemoglobin over 22 g/dL to the health care provider

🧠 Thick blood needs THIN fluid. Polycythemia = a traffic jam of red cells → hydrate to keep the tiny brain vessels open.

💧

WET

STEP 2 · LEFT → RIGHT · CHF

Blood loops back through the lungs instead of going out — the heart gets overloaded and fails.

💧 CHF (Congestive Heart Failure) — LEFT to right flow

These four defects push blood from the LEFT side back to the RIGHT: ASD · VSD · PDA · AVSD.

🧠 Memory Trick — HF = Heart Failure. HF = Heavy Fluid. Left to right, the lungs and the pump get heavy with fluid.

🧠 Every left→right defect hides a “D” — ASD · VSD · PDA · AVSD = a Door left open. Open door → blood Detours back to the lungs.

🕳️ ASD — Atrial Septal Defect

A hole in the septum between the two atria — red blood leaks back into the right side and takes another lap through the lungs.

🕳️ VSD — Ventricular Septal Defect

A hole in the septum between the two ventricles — the strong left pump squeezes blood straight into the right pump. (This same hole is defect #3 of TOF.)

🔓 PDA — Patent Ductus Arteriosus

Patent = still open. A duct still connects the aorta to the pulmonary artery, so body-bound blood is siphoned back toward the lungs.

🧠 P = Patent = the Pipe never closed. A shortcut between the two big vessels.

🕳️ AVSD — Atrioventricular Septal Defect

One large central hole where the atrial and ventricular septa meet — an ASD and a VSD in the same spot. The biggest left→right leak of the four.

💦 Signs & symptoms — the heavy, wet baby NCLEX TIP

Diaphoresis & Grunting — during feedings 🍼
Dyspnea 💨
Tachypnea & Tachycardia 📈
Poor weight gain ⚖️

🧠 Feeding is a baby's workout. Sweating & grunting through a bottle is the infant version of getting winded on the stairs.

👀 What you'll SEE & count NCLEX TIP

🤍 Pale, cool extremities

👁️ Puffiness around the eyes (periorbital edema)

🧷 Reduction in number of wet diapers

🧠 P-P-D: Pale · Puffy · Dry diapers. And remember: Weight Gain = Water Gain ⚖️💧 — the scale is a fluid monitor, not a growth chart.

🚧

BLOCKED

STEP 3 · OBSTRUCTIVE

No shunt at all — the door out is just too narrow.

🚧 Obstructive Defects — Stenosis

Stenosis = a narrowed valve. Two to know: Pulmonary Stenosis & Aortic Stenosis. Nothing crosses the septum here — the blood simply can't get out fast enough through a squeezed doorway.

🧠 “Stenosis = Squeezed.” 🫁 Pulmonary squeezes the road to the lungs · 🧍 Aortic squeezes the road to all the body.

🫁 Pulmonary Stenosis

The pulmonary valve is narrowed — the RIGHT ventricle has to force blood through a squeezed doorway on its way to the lungs.

🧍 Aortic Stenosis

The aortic valve is narrowed — the LEFT ventricle has to force blood through a squeezed doorway on its way out to the body.

🗂️ Sort any defect in 5 seconds

🔵 RIGHT → LEFT	💧 LEFT → RIGHT	🚧 OBSTRUCTIVE
Defects
The 4 T's TOF · TGA · Truncus · Tricuspid atresia	The 4 D's ASD · VSD · PDA · AVSD	Stenosis Pulmonary · Aortic
Big problem
Hypoxia (low O₂) MOST deadly & MOST tested	CHF HF = Heavy Fluid	Narrowed valve squeezed exit
Looks like
Cyanosis · clubbing · polycythemia · clot risk	Sweating & grunting with feeds · puffy eyes · dry diapers	—
Remember
“If it starts with T — it's trouble”	Weight Gain = Water Gain	Stenosis = Squeezed

⚡

QUICK RECALL

SAY IT OUT LOUD

🚨 T = TroubleTOF · TGA · Truncus · Tricuspid atresia = right→left = hypoxia.

💧 HF = Heavy FluidASD · VSD · PDA · AVSD = left→right = CHF.

🧪 Hgb > 22 = reportPolycythemia → thick blood → delayed stroke.

💦 Hydrate the blue babyPriority intervention for right→left defects.

🎯 Cover & check — 4 rapid-fire questions

Q1: Name the 4 defects that start with T — and why are they trouble?

Tetralogy of Fallot, Transposition of the Great Vessels, Truncus arteriosus, Tricuspid atresia — RIGHT to left blood flow takes blood away from the lungs → hypoxia (blue babies). MOST deadly & MOST tested; TOF & TGA top the list.

Q2: A cyanotic infant's hemoglobin is 23.4 g/dL. What do you do, and why?

Report it — OVER 22 g/dL is PRIORITY and must go to the health care provider. Polycythemia makes thick, viscous blood → traffic jam → clot in the tiny brain vessels → delayed stroke. Priority intervention = hydration.

Q3: Which defects cause CHF, and which way does the blood flow?

ASD, VSD, PDA, AVSD — LEFT to right. HF = Heart Failure = Heavy Fluid.

Q4: A parent reports fewer wet diapers. What 2 other findings go with it?

Pale, cool extremities and puffiness around the eyes (periorbital edema). P-P-D: Pale · Puffy · Dry diapers — and Weight Gain = Water Gain.