Back to Classroom |Coronary Blood Supply to the Heart*
* Source: Braunwald, E. Heart Disease, A Textbook of Cardiovascular Medicine, 5th Ed. W.B. Saunders Company, Philadelphia, 1980.
Artery
Percentage of Time from RCA or LAD
Area Perfused
Left Main (MLCA) 98% present Entire LV, LA except the posterior portion of IV septum and adjacent area when PD is branch of RCA Left Anterior Descending (LAD) 98% from MLCA Anterior 2/3 of IV septum, anterior portion of LV, whole apex First Diagonal(D1) 100% off LCA High lateral wall of LV Second Diagonal(D2) 100% off LCA Lower lateral aspect of LV free wall First Septal (S1) 99.8% off LCA Superior and anterior portion of IV septum Minor Septals (S) 100% off LCA Inferior and anterior 1/3 of septum Interventricular (Ramus interventricularis) 100% off LCA Anterior aspect of apex Circumflex (Cx) 97% off LCA, separate ostisum in 2%, off RCA 1% Obtuse margin of heart and its entire posterior wall, LA, post-IV septum if PD is off Cx Obtuse Marginal (OM) 97% off LCA Obtuse margin of heart, adjacent posterior LV Posterolateral (PL) 80% off LCA, 20% off RCA Posterior and diaphragmatic LV wall Posterior Descending (PD) 18% off LCA, 82% off RCA, 4% RCA and Cx Posterior IV septum and diaphragmatic LV Right Coronary Artery (RCA) 84% around the crux RA and part of LA, RV, posterosuperior IV septum, SN, and AV node Acute Marginal (AM) 100% off RCA Inferior and diaphragmatic surface of RV Posterior Descending (PD) 82% off RCA, 18% off LCA, 4% off RCA and Cx Posterior and diaphragmatic area of septum Conus Branch (CB) 60% off RCA, 40% as a separate vessel off RCA ostium Outflow tract of RV Sinus node (SN) 59% off RCA, 39% off Cx, 2% off Cx and RCA RA, LA, SN Right Ventricular Branch (RV) 100% off RCA Right Ventricle Atrial Branch (A) 100 % off RCA Right Atrium
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