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Related Subjects:
|Cardiac Anatomy and Physiology
|Coronary Artery Anatomy
Coronary Artery | Origin | Branches | Supplied Areas |
---|---|---|---|
LCA | Left aortic sinus | LAD (septal + diagonal), LCx (obtuse marginals) | LAD → anterior LV, septum, apex
LCx → lateral LV, posterior wall (in left dominance) |
RCA | Right aortic sinus | PDA (in 85%), Right marginal | RA, RV, SA node, AV node; PDA → inferior LV, posterior septum |
PDA | RCA (85%) or LCx (8–10%) | N/A | Posterior LV wall + septum |
LMCA | Left aortic sinus | Divides into LAD + LCx | Supplies most of LV |
Artery | Leads Affected | ECG Changes | Area Supplied |
---|---|---|---|
LAD | V1–V4 | ST ↑, Q waves, T inversion | Anterior LV, septum |
LCx | I, aVL, V5–V6 | ST ↑ lateral leads | Lateral LV |
RCA | II, III, aVF | ST ↑ inferior leads | Inferior LV, RV |
PDA | V7–V9 (posterior leads) | ST ↑ posterior; ST ↓ V1–V3 (reciprocal) | Posterior LV |
LMCA | V1–V6, I, aVL | Widespread ST changes | Large LV territory |
Coronary perfusion is unique: maximal in diastole (when myocardium relaxes). Perfusion depends on myocardial oxygen demand, autoregulation, and vessel calibre.