Revision 23 for 'Left main coronary artery'

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Left main coronary artery

The left main coronary artery (LMCA) or left coronary artery (LCA) is one of the two main arteries that supply the heart with oxygenated blood.

Gross anatomy


It is a branch of the ascending aorta, with its normal origin in the left aortic sinus, just superior to the aortic valve 1-2.


LMCA runs for 5-10 mm as it passes to the left and posterior to the pulmonary trunk before bifurcating 1-2.


Coronary dominance

Most hearts are right dominant where the PDA is supplied by the RCA. However up to 20% of hearts may be left dominant, where the PDA is supplied by the LAD or LCx or codominant, where a single or duplicated PDA is supplied by branches of both the RCA and LAD/LCx.

For a more in depth discussion of coronary dominance, see the article coronary arterial dominance.

Variant anatomy

Anatomical variations of the LMCA include 3:

See main article: congenital coronary artery anomalies.

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