Clinical Mnemonics · Cardiology & ECG
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Memorize the four heart valves in the exact order blood flows through them — Tricuspid, Pulmonic, Mitral, Aortic — and trace the complete path of blood through the heart, chamber by chamber, valve by valve, and vessel by vessel.
The college version
Memorize the four heart valves in the exact order blood flows through them — Tricuspid, Pulmonic, Mitral, Aortic — and trace the complete path of blood through the heart, chamber by chamber, valve by valve, and vessel by vessel.
T — Tricuspid valve
Right atrium → right ventricle (deoxygenated blood); the first valve in blood flow
The tricuspid valve is the right atrioventricular (AV) valve, with three leaflets anchored by chordae tendineae to papillary muscles. It opens during diastole (atrial contraction, low ventricular pressure) and closes during ventricular systole to prevent regurgitation back into the atrium and systemic veins.
Physiology. Valves are pressure-driven: blood flows from higher to lower pressure. When atrial pressure exceeds ventricular pressure the valve opens; when the ventricle squeezes and its pressure climbs, the valve snaps shut. Leaflets + chordae + papillary muscles keep the door from flipping the wrong way.
Safety. Right-sided valve disease backs blood up into the body (leg edema, ascites, JVD) rather than the lungs — assess for systemic venous congestion.
P — Pulmonic valve
Right ventricle → pulmonary artery (sends blood to the lungs for oxygenation)
The pulmonic valve is a semilunar valve (three crescent-shaped cusps) between the right ventricle and the pulmonary trunk. It opens during right-ventricular systole and closes at the start of diastole to prevent backflow. The pulmonary artery is the only artery in the body that carries deoxygenated blood.
Physiology. Semilunar valves have three pocket-like cusps and no chordae. During ejection the cusps are pushed flat against the vessel wall; when the ventricle relaxes, falling pressure fills the cusps like little parachutes and they seal shut.
Safety. Pulmonary hypertension raises right-heart pressures and stresses this valve — watch for dyspnea, fatigue, and signs of right-sided failure.
M — Mitral valve
Left atrium → left ventricle (oxygenated blood); the left AV valve
The mitral valve is the left AV valve, with two leaflets (anterior and posterior), chordae tendineae, and papillary muscles. It separates the left atrium from the left ventricle and closes during systole to prevent backflow of oxygenated blood into the lungs during left-ventricular contraction.
Physiology. The mitral valve withstands the highest pressures in the heart (left-ventricular systolic pressure ~120 mmHg). Its leaflets, chordae, and papillary muscles must be intact — a ruptured papillary muscle or chordae (as in some MIs) causes catastrophic acute mitral regurgitation.
Safety. Acute mitral regurgitation from papillary-muscle rupture is an emergency — sudden pulmonary edema and cardiogenic shock require urgent surgical evaluation.
A — Aortic valve
Left ventricle → aorta (delivers oxygenated blood to the whole body)
The aortic valve is a semilunar valve with three cusps between the left ventricle and the aorta. It opens during systole to permit ejection into the systemic circulation and closes during diastole. The coronary arteries arise just above it, so coronary perfusion depends on diastolic pressure and a competent valve.
Physiology. The aortic valve faces the entire systemic arterial pressure (~80 mmHg diastolic). Because the coronary ostia sit just beyond it, tight stenosis can starve the heart muscle itself, and regurgitation drops diastolic pressure and lowers coronary perfusion — explaining chest pain in both.
Safety. Symptomatic aortic stenosis (syncope, angina, dyspnea) is high-risk for sudden death and needs prompt cardiology evaluation — a murmur plus exertional syncope is never a "wait and see" finding.
Memory aids
- T = Tricuspid valve
- P = Pulmonic valve
- M = Mitral valve
- A = Aortic valve
Quick review
- T = Tricuspid valve — Right atrium → right ventricle (deoxygenated blood); the first valve in blood flow
- P = Pulmonic valve — Right ventricle → pulmonary artery (sends blood to the lungs for oxygenation)
- M = Mitral valve — Left atrium → left ventricle (oxygenated blood); the left AV valve
- A = Aortic valve — Left ventricle → aorta (delivers oxygenated blood to the whole body)
Eli explains
The same idea, in plain words
Explain it like I’m 10
It's a silly sentence where each word's first letter is one of the four doors inside your heart, in the order a drop of blood actually walks through them: T for Tricuspid, P for Pulmonic, M for Mitral, A for Aortic.
T — Tricuspid valve. The tricuspid valve is a one-way door with three flaps ("tri" = three) on the right side of the heart. Used-up, low-oxygen blood pools in the top-right room (right atrium), then drops through this door into the bottom-right room (right ventricle). Then the door slams shut so blood can't sneak backward.
P — Pulmonic valve. The pulmonic valve is the exit door of the bottom-right room. When the right ventricle squeezes, this door opens so blood can shoot up the pulmonary artery to the lungs, where it drops off carbon dioxide and picks up fresh oxygen.
M — Mitral valve. The mitral valve is the entry door of the bottom-left room, the strongest pump in the heart. It has only two flaps (it is the bicuspid valve — "bi" = two) and looks a bit like a bishop's hat (a mitre). Freshly oxygenated blood drops through it into the powerful left ventricle.
A — Aortic valve. The aortic valve is the big exit door of the strongest room. The left ventricle squeezes hard and pushes oxygen-rich blood through this door into the aorta, the huge highway that sends blood to the brain, arms, legs, and every other part of the body.
Study tools & related lessonsKey vocabulary · Related
Key vocabulary
- T
- Tricuspid valve
- P
- Pulmonic valve
- M
- Mitral valve
- A
- Aortic valve
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