Nursing Field Notes / Cardio · Pathophysiology Course

Variant Angina 🌀

Prinzmetal / vasospastic angina — the artery clenches

NG-098 Cardio · Angina ADHD-friendly visual edition

Every other angina is a plumbing problem. This one is a muscle cramp. The coronary artery goes into SPASM — the smooth muscle in the wall clamps down and shuts off flow — even in an artery with little or no plaque. It strikes at REST, classically at night or in the early morning, and it opens right back up with nitrates and calcium channel blockers.

📄 Simple Nursing original — opens in Drive →

🌀 SPASM, not plaqueThe artery clamps shut. Stage 3 of NG-145 isn't required — the wall can be nearly clean.

🛏️ Pain at RESTOften midnight–8 a.m. Wakes her from sleep. Exercise usually doesn't trigger it.

💊 CCB = the answerCalcium channel blockers prevent it; nitrates relieve it. Spasm relaxes fast.

🥶 Cold · stress · smoke · cocaineThe four triggers. Cocaine chest pain in a young adult = think spasm.

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THE SPASM

STEP 1 · A CRAMP IN THE ARTERY

Same cross-section you learned on NG-145 — but this time the lumen closes because the wall squeezes, not because a plaque grew.

🌀 Spasm closes the artery — then lets go

🧠 “A charley horse in the coronary.” A leg cramp doesn't mean your leg is clogged — the muscle just seized. Variant angina is that cramp, in an artery wall. Stretch it out (nitrate, calcium channel blocker) and flow returns instantly.

🔬 Why the wall clamps

😖 Trigger — cold, stress, smoking, cocaine

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🧬 Endothelial dysfunction — the lining fails to release enough nitric oxide, its natural relaxer

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💪 Hyperreactive smooth muscle — calcium floods in and the wall contracts hard

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🌀 Focal spasm → flow stops → transmural ischemia → chest pain + ST elevation

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😮‍💨 Spasm releases → flow returns → EKG normalizes

🧠 Nitric oxide is the artery's chill pill. Nitrates literally donate what the endothelium isn't making. Calcium channel blockers take away the calcium the muscle needs to squeeze. Two ways to say “unclench.”

🎯 The four classic triggers

🥶COLDcold air, cold water

😖STRESSemotional surge

🚬SMOKINGthe biggest one

💊COCAINE& stimulants

🌬️Hyperventilation

🍺Alcoholin some clients

🌙Circadianmidnight–early a.m.

💉Vasoconstrictorstriptans, ergots

Smoking is the standout risk factor — variant angina often shows up in a younger client who smokes and who may have few traditional cholesterol risk factors.

🧠 “CSSC” — Cold, Stress, Smoke, Cocaine. Picture standing outside in the cold at 3 a.m., stressed, smoking. That's the exact scene the exam will describe.

🚨 Cocaine chest pain — the trap inside the trap

Answer first: Do NOT give a beta blocker for cocaine-induced chest pain.

Cocaine stimulates both alpha and beta receptors. Blocking beta leaves alpha unopposed → worse vasoconstriction & spasm, higher BP
What is used instead: benzodiazepines (calm the sympathetic surge), nitrates, calcium channel blockers, aspirin
Cocaine can cause a true MI in a young person with clean arteries — it causes spasm and raises platelet aggregation and raises O₂ demand all at once
Ask about recent use in every young adult with chest pain — the answer changes the drug you give

🧠 “Beta blocker + cocaine = squeeze without a release valve.” You closed the only door the pressure had. Benzos before blockers.

🆚

STABLE vs UNSTABLE vs VARIANT

STEP 2 · TELL THEM APART

This table is the whole exam question. Three anginas, three different stories — and only one of them is a spasm.

📊 The three-way comparison

	🙂 STABLE angina “safer”	😰 UNSTABLE angina “unsafe”	🌀 VARIANT / Prinzmetal vasospastic
Cause	Fixed plaque — stable, thick-capped, narrows the lumen ~70%+	Plaque rupture + partial clot — the cap tore but the artery isn't fully shut	SPASM of the smooth muscle — plaque may be minimal or absent
What brings it on	Exertion or emotion — a predictable amount of activity, every time	Less and less exertion — now happens at rest, new, worsening, longer	At REST — not related to exertion. Cold, stress, smoking, cocaine, hyperventilation
Time of day	Anytime she exerts	Anytime — increasingly unpredictable	Classically at NIGHT or EARLY MORNING — often wakes her from sleep, same time most nights
Duration	3–5 min, usually under 15 min	Longer, >20 min is worrying	Usually 5–15 min, may come in clusters of attacks
Relieved by	REST and/or nitroglycerin — reliably	NOT reliably relieved by rest or nitro → treat as ACS	Nitroglycerin — fast. Rest alone doesn't fix it because rest didn't cause it
EKG during pain	ST depression (subendocardial), resolves with rest	ST depression and/or T-wave inversion — may be normal	TRANSIENT ST ELEVATION that resolves completely when the spasm breaks — looks like a STEMI that goes away
Troponin	❌ Negative	❌ Negative (positive = it's an NSTEMI now)	❌ Usually negative — positive only if a long spasm actually infarcted muscle
Typical client	Older, classic CAD risk profile	Known CAD, now escalating	Younger, often a smoker, may have few cholesterol risk factors; more common in women in some populations
First-line drug	Beta blocker + nitrates, statin, aspirin	ACS protocol: aspirin, antiplatelet, anticoagulant, nitrate, cath	CALCIUM CHANNEL BLOCKERS (prevention) + nitrates. Avoid nonselective beta blockers
Danger	Progresses to unstable over time	One step from MI — this is ACS	Can still cause dysrhythmias, MI or sudden death if the spasm is long — don't dismiss it

🧠 “Stable = predictable, Unstable = escalating, Variant = 3 a.m.” If the stem says “wakes at night, no exertion, relieved by nitro, ST elevation that went away” — that's Prinzmetal every single time.

⏰ When each one hurts — a 24-hour view

🧠 The single best assessment question in this whole topic: “What were you doing when the pain started?” Climbing stairs → stable. Sitting still, and it's new/worse → unstable. Sound asleep at 3 a.m. → variant.

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CLUES

STEP 3 · CATCH IT IN THE ACT

The hard part is that everything is normal between attacks — you have to catch the EKG during the pain.

📈 The EKG signature: ST elevation that comes and goes

NCLEX TIP ST elevation that resolves completely and a negative troponin = think spasm. A true STEMI's ST elevation does not simply melt away, and its troponin rises. But you never assume — every ST elevation is treated as a STEMI until the picture proves otherwise.

🧠 “The STEMI that ran away.” Elevation during the pain, flat line after the nitro, troponin negative — the artery cramped, then let go.

🔬 How it's diagnosed

📈 12-lead EKG DURING an episode — the money shot. Transient ST elevation in the affected artery's leads.
📼 Ambulatory/Holter monitoring — catches nighttime episodes she sleeps through
🧪 Serial troponins — negative in a pure spasm; positive means muscle actually died
🩻 Coronary angiography — often shows little or no significant fixed obstruction, which is the diagnostic surprise
💉 Provocative testing (e.g., ergonovine or acetylcholine during cath) can reproduce spasm in specialized settings
🏃 Exercise stress testing is often normal — exertion isn't the trigger

🧠 “Clean cath + chest pain at night = spasm.” When the angiogram is unimpressive but the pain is real, stop looking for plaque and start thinking muscle.

🚨 Don't file it under “harmless”

Answer first: variant angina is usually benign with treatment — but a prolonged spasm can still cause real damage.

💔 MI if the spasm lasts long enough to infarct
⚡ Ventricular dysrhythmias during the ischemic window — including V-tach/V-fib
🫥 Syncope during an attack (often from a dysrhythmia or heart block)
💀 Sudden cardiac death — rare, but the reason it gets treated aggressively
🔁 Spasm can also occur on top of existing plaque — the two are not mutually exclusive

🧠 Any chest pain gets the EKG and the workup. "It's probably just spasm" is a diagnosis made after the MI is ruled out, never before.

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CARE

STEP 4 · UNCLENCH IT

Two drug classes make the artery relax, one drug class can make it worse, and one habit undoes everything.

💊 What works — and why it works

✅ Calcium channel blockers — first line

amlodipine, diltiazem, verapamil, nifedipine

Block the calcium the smooth muscle needs to contract → the artery can't clamp. This is the prevention drug — scheduled, daily, often dosed to cover the nighttime hours.

Watch: hypotension, headache, flushing, peripheral edema; diltiazem & verapamil also slow HR — hold parameters per order. Verapamil → constipation.

✅ Nitrates

SL nitroglycerin for an attack; long-acting isosorbide for prevention

Donate nitric oxide → immediate vasodilation. Relief is fast, which is itself a diagnostic clue.

Watch: headache (expected), orthostatic hypotension — sit down first. Never with PDE-5 “-afil” drugs.

❌ Nonselective beta blockers — generally AVOIDED

Blocking beta-2 leaves alpha vasoconstriction unopposed → the spasm can get worse. Same logic as cocaine chest pain.

EXAM TIP "Which order does the nurse question?" — a nonselective beta blocker (e.g. propranolol) prescribed for vasospastic angina.

Also on board: aspirin is used cautiously here (high doses can inhibit protective prostacyclin), a statin if there's any coexisting atherosclerosis, and treating any coexisting CAD as usual. Stents and bypass do NOT fix spasm — you cannot stent a muscle cramp; the artery can spasm right next to the stent.

🧠 “CCB keeps the Cramp from Coming Back.” Nitro stops the attack; the calcium channel blocker prevents the next one. Two different jobs, both prescribed.

🏠 Teaching — the parts she controls

🚭 STOP SMOKING. Non-negotiable and the highest-yield intervention — nicotine is a direct vasoconstrictor and smoking is the leading modifiable trigger.

🥶 Avoid cold exposure. Dress warm, scarf over the mouth in cold air, warm the car before going out, avoid cold-water plunges.

🚫 No cocaine or stimulants. Ask without judgment; this changes the emergency treatment.

😌 Stress reduction. Sleep, relaxation practice, treat anxiety — sympathetic surges are triggers.

💊 Take the CCB even when she feels fine — it's a preventer, not a rescue. Skipping doses is the usual reason attacks come back.

🆘 Carry nitroglycerin. Sit or lie down, take SL 0.4 mg, may repeat q5 min up to 3 doses; still in pain → call 911.

🧠 “Warm, calm, smoke-free, dosed.” Four words that cover the entire discharge teaching for this page. If a distractor says “increase exercise to prevent attacks,” it's wrong — exertion isn't the trigger here.

✅ Nursing actions during an attack

1️⃣ Stop activity, sit or lie her down, stay with her
2️⃣ 12-lead EKG NOW — while the pain is happening. This is the diagnosis.
3️⃣ Vitals + continuous monitoring — watch for dysrhythmias
4️⃣ Nitroglycerin per protocol, checking BP before and after each dose
5️⃣ O₂ only if hypoxic (same rule as NG-071)
6️⃣ Serial troponins to rule out infarction
7️⃣ Document the time, trigger, duration and what relieved it — the pattern is the diagnosis

🧠 Get the strip while it hurts. Twenty minutes later that EKG is normal, and the whole diagnosis walks out the door with the spasm.

⚠️ Answer-changers to memorize

❌ Nonselective beta blocker for vasospastic angina — can worsen spasm
❌ Beta blocker for cocaine chest pain — unopposed alpha
❌ Nitrates within 24 h of a PDE-5 “-afil” drug — profound hypotension
❌ Triptans & ergotamines (migraine drugs) — vasoconstrictors, avoid
❌ Stents don't prevent spasm — the muscle can still cramp
✅ Exercise stress test normal ≠ no disease in this client

🧠 Everything on this list either squeezes an artery that's already squeezing, or drops a BP that's about to drop. That's the whole rule.

⚡

QUICK RECALL

SAY IT OUT LOUD

🌀 Spasm, not plaqueArtery clamps and lets go. Cath can look nearly clean.

🛏️ Rest · night · early a.m.Wakes her from sleep. Exertion is NOT the trigger.

📈 Transient ST elevationResolves fully · troponin negative

💊 CCB + nitratesPrevent + relieve. Avoid nonselective beta blockers.

🎯 Cover & check — 7 rapid-fire questions

Q1: What actually blocks the artery in variant angina?

Spasm of the smooth muscle in the artery wall — not a fixed plaque. The artery clamps shut, then releases. Plaque may be minimal or absent.

Q2: A client's chest pain wakes her at 4 a.m. most nights and is gone in 10 minutes with nitro. Which angina?

Variant (Prinzmetal) angina — at rest, nocturnal/early morning, rapid nitrate response.

Q3: What does the EKG show during an attack, and after?

Transient ST ELEVATION during the spasm (transmural ischemia), returning completely to baseline after the spasm breaks. Troponin usually stays negative.

Q4: Which drug class is first-line to prevent attacks?

Calcium channel blockers — they remove the calcium the smooth muscle needs to contract. Nitrates relieve the acute attack; the CCB prevents the next one.

Q5: Which prescription would the nurse question?

A nonselective beta blocker. Blocking beta-2 leaves alpha-mediated vasoconstriction unopposed and can worsen the spasm.

Q6: 26-year-old with chest pain after cocaine use — what do you NOT give?

A beta blocker — unopposed alpha stimulation worsens vasoconstriction and hypertension. Benzodiazepines, nitrates, calcium channel blockers and aspirin are used instead.

Q7: Name the three anginas in one line each.

Stable = fixed plaque, predictable with exertion, relieved by rest. Unstable = ruptured plaque, at rest, new/worse, NOT relieved — this is ACS. Variant = spasm, at rest at night, ST elevation that resolves, treated with CCBs and nitrates.