Friday, April 24, 2020

Coronary artery anatomy mnemonic and video for visualization

Let's learn about the coronary artery anatomy today (and never forget it!)

Watch the video. Text and images below.

The left main coronary artery (LMCA) emerges from the left aortic cusp. The LMCA travels from the aorta, and passes between the pulmonary trunk and the left atrial appendage. LMCA bifurcates into the left anterior descending (LAD) and the left circumflex artery (LCx).

LAD runs in the anterior interventricular sulcus to reach the cardiac apex. The LAD gives off two types of branches: septals and diagonals. Septals supply the anterior 2/3rds of the interventricular septum. Diagonals supply the lateral wall of the left ventricle. LAD supplies the anterolateral myocardium, apex, and interventricular septum.

LCx runs in the left atrioventricular groove between the left ventricle and left atrium. It gives off the obtuse marginals (OM). The LCX supplies the posterolateral left ventricle.
Mnemonic: OLA Obtuse Left marginal Artery

The right coronary artery (RCA) emerges from the right aortic cusp. It travels down the right atrioventricular groove. It branches into the posterior descending artery (PDA) and the acute marginal artery (AM). RCA supplies the sinoatrial nodal artery in 60% and the atrioventricular nodal artery 80-90% of people.
Mnemonic: ARM Acute Right Marginal.

PDA runs in the posterior interventricular sulcus to the apex of the heart where it meets the LAD. It supplied the inferior wall of the right ventricle and the inferior 1/3 of the interventricular septum. PDA defines coronary dominance.
Mnemonic: Posterior Descending and Dominating Artery.

The ugly picture that I drew in the video:

That's all!

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