blood supply to cardiac conduction system

Blood supply to cardiac conduction system

Schematic diagram of blood supply to cardiac conduction system. The first septal branch of the left anterior descending (LAD) coronary artery supplies a critical portion of the interventricular conduction system (red oval). AV, atrioventricular; marginal a., marginal artery; PDA, posterior descending artery; RCA, right coronary artery; SA, sinoatrial. Reproduced, with permission, from Harthorne JW, Pohost. GM, Electrical therapy of cardiac dysrhythmias. In Levine, HJ (ed) Clinical Cardiovascular Physiology, New York, Grune and Stratton: 1976. pp. 853–882

Blood Supply to Bundle of Branches

LBBB RBBB

Anterosuperior fascicle Posteromedial fascicle

Both LAD and RCA 50% By septal

branch of LAD and AV node branch of RCA

Other 50% by only LAD

50% Only by the AV nodal branch of RCA(Kugel’s artery)

Other 50% by AV nodal branches of RCA

Septal branches of LAD

Both LAD and RCA50% By septal branch of LAD and AV node branch of RCAOther 50% by only LAD

Simplification is the finest art