🧠Step 7 — Student Memory Support

Cardiovascular System (CVS) Module 3rd Year

🧠 Step 9 — Student Memory Support

🃏 1️⃣ High-Yield Flashcards

What is the core mechanism of ischemic heart disease?

Myocardial oxygen supply–demand mismatch.

What is ischemia?

Reduced blood supply causing reversible oxygen deficiency if short-lived.

What is infarction?

Tissue necrosis due to prolonged ischemia.

What differentiates stable angina from myocardial infarction?

Stable angina has reversible ischemia and normal troponin; MI has necrosis and raised troponin.

Which coronary artery supplies the anterior wall and anterior interventricular septum?

LAD / anterior interventricular artery.

Which heart valves have chordae tendineae and papillary muscles?

Mitral and tricuspid valves.

Which valves are semilunar valves?

Aortic and pulmonary valves.

What is the classic clinical clue of chronic stable angina?

Predictable exertional retrosternal pressure relieved by rest or nitroglycerin.

What ECG change may appear during stress in stable angina?

ST-segment depression.

What is the typical troponin finding in stable angina?

Troponin is usually normal.

What is the key mechanism of vasospastic angina?

Transient coronary artery smooth muscle spasm.

What is the classic clue for vasospastic angina?

Rest pain, often at night or early morning, with transient ST elevation and normal angiogram between attacks.

What is the prototype nitrate used for acute anginal relief?

Nitroglycerin.

How do nitrates relieve angina?

NO release → ↑ cGMP → venodilation → ↓ preload → ↓ myocardial oxygen demand.

What is the major dangerous interaction of nitrates?

PDE-5 inhibitors such as sildenafil can cause severe hypotension.

Why are β-blockers useful in stable angina?

They reduce heart rate and contractility, lowering myocardial oxygen demand.

Which drug class is especially useful in vasospastic angina?

Calcium channel blockers.

What is the key adverse effect of ranolazine?

QT prolongation.

🧠 2️⃣ Mnemonics

Mnemonic Title: Stable Angina Clues

Mnemonic Word: ERRN
Meaning:
E — Exertional pain
R — Relieved by rest
R — Relieved by nitrates
N — Normal troponin

Mnemonic Title: Antianginal Drug Groups

Mnemonic Word: NBC-R
Meaning:
N — Nitrates
B — β-blockers
C — Calcium channel blockers
R — Ranolazine

Mnemonic Title: Nitrate Safety

Mnemonic Word: H3P
Meaning:
H — Headache
H — Hypotension
H — Heart rate may rise by reflex tachycardia
P — PDE-5 inhibitors are prohibited

Mnemonic Title: Vasospastic Angina Clue

Mnemonic Word: REST
Meaning:
R — Rest pain
E — Early morning/night attacks
S — Spasm of coronary artery
T — Transient ST elevation

📋 3️⃣ Memory Tables

Table 1 — Ischemia vs Infarction

Feature	Ischemia	Infarction
Core meaning	Reduced blood supply	Tissue death
Reversibility	Reversible if short-lived	Irreversible
Main cell change	↓ O₂, ↓ ATP	Myocyte necrosis
Troponin	Usually normal	Raised
Pain pattern	May settle with rest/nitrate	Persistent severe pain
Morphology	No necrosis	Coagulative necrosis

Table 2 — Stable Angina vs Vasospastic Angina

Feature	Stable Angina	Vasospastic Angina
Main mechanism	Fixed coronary narrowing	Coronary artery spasm
Pain timing	Exertion/stress	Rest, night/early morning
ECG clue	Stress ST depression	Transient ST elevation
Troponin	Usually normal	Usually normal unless prolonged injury
Angiogram	May show fixed stenosis	May be normal between attacks
Best drug logic	Reduce oxygen demand	Relieve/prevent spasm
Useful drugs	β-blocker, nitrate, CCB	Nitrate, CCB

⚡ 4️⃣ Rapid Revision Points

Must Remember

• Ischemic heart disease is mainly due to myocardial oxygen supply–demand mismatch.

• Stable angina is transient reversible ischemia, not necrosis.

• Myocardial infarction means irreversible myocyte death.

• MI classically shows coagulative necrosis.

• Troponin is normal in stable angina and raised in infarction.

• LAD supplies anterior LV wall and anterior interventricular septum.

• Mitral and tricuspid valves are AV valves with chordae tendineae.

• Aortic and pulmonary valves are semilunar valves without chordae tendineae.

• Nitroglycerin is the prototype nitrate for acute anginal relief.

• Nitrates must not be combined with PDE-5 inhibitors.

• β-blockers reduce myocardial oxygen demand by lowering HR and contractility.

• Ranolazine can cause QT prolongation.

🩺 5️⃣ Clinical Memory Hooks

Clinical Hook 1

Exertional retrosternal pressure relieved by rest → Chronic stable angina

Clinical Hook 2

Normal troponin with chest pain → Ischemia without infarction

Clinical Hook 3

Raised troponin after prolonged chest pain → Myocardial infarction

Clinical Hook 4

Rest pain + transient ST elevation + normal angiogram → Vasospastic angina

Clinical Hook 5

Nitrate use with sildenafil-type drug → Severe hypotension risk

⭐ 6️⃣ Starred High-Yield Exam Points

⭐ High-Yield Points:

• ⭐ Most tested mechanism: Stable angina is due to reversible myocardial ischemia from oxygen supply–demand mismatch.

• ⭐ Hallmark morphology: Myocardial infarction shows coagulative necrosis.

• ⭐ Diagnostic clue: Normal troponin favors angina; raised troponin favors infarction.

• ⭐ High-yield artery: LAD supplies anterior wall and anterior interventricular septum.

• ⭐ Prototype drug: Nitroglycerin is the prototype nitrate for acute anginal relief.

• ⭐ Major contraindication: Nitrates are contraindicated with PDE-5 inhibitors due to severe hypotension.

• ⭐ Drug logic: Calcium channel blockers are especially useful in vasospastic angina.

• ⭐ Serious adverse effect: Ranolazine may cause QT prolongation.