General Cardiology Part 3

Question 2/36
What determines the dominance of the coronary arteries (left versus right dominance)?
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Question 2/36
What determines the dominance of the coronary arteries (left versus right dominance)?

Coronary dominance refers the which vessel the posterior descending coronary artery arises from.

In approximately 80% of individuals the posterior descending artery (PDA) arises from the right coronary artery and is referred to as a “right dominant” system. In approximately 10% of individuals the left circumflex coronary artery is considered dominant and it supplies a left posterior descending artery. This is considered a “left dominant” system. The remaining 10% have a “co-dominant” coronary system meaning both the right coronary artery and the left circumflex contribute to the PDA.
 

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