Which artery supplies the left ventricle most of the time?

• A. Right coronary artery
• B. Circumflex artery
• C. Posterior descending artery
• D. Left anterior descending artery (LAD)

Answer: (D)

The left ventricle receives most of its blood supply from the left coronary artery branches, with the left anterior descending artery delivering the majority of flow. The LAD runs in the anterior interventricular groove and supplies the anterior wall, a large portion of the interventricular septum, and the apex. Because these areas make up most of the LV mass, the LAD serves as the principal supplier for the left ventricle in most people. The circumflex artery mainly perfuses the lateral and, in some hearts, part of the posterior wall, while the posterior descending artery (often arising from the right coronary artery in most individuals) supplies the inferior/posterior region. Thus, the left anterior descending artery is the best single answer for supplying the left ventricle most of the time.