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Old 01-09-2013
wertheworld11's Avatar
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Heart peak flow in right coronary artery

can anyone please explain when the peak flow occurs in the right coronary artery please..

There was a similar question in one of the NBME forms and the options were

a. early systole
b. late systole
c. early diastole
d. late diastole

i know the peak flow occurs in early diastole in the left coronary but is it the same for the right coronary?
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Old 01-10-2013
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I will say ya in both as both take there origin at aorta valve,so i think there will no difference in flow of these vessels
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Old 01-12-2013
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Default Flow diference between right coronary artery and left anterior descending artery

Quote:
Originally Posted by wertheworld11 View Post
can anyone please explain when the peak flow occurs in the right coronary artery please..

There was a similar question in one of the NBME forms and the options were

a. early systole
b. late systole
c. early diastole
d. late diastole

i know the peak flow occurs in early diastole in the left coronary but is it the same for the right coronary?
left anterior descending and right coronary artery flow profile:
left artery descending artery (LAD) shows a predominantly diastolic flow,whereas
right coronary artery (RCA) shows about equal flow values during systole and diastole.
www.ncbi.nlm.nih.gov/pubmed/10433289
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Old 01-12-2013
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Hey guys i just found this answer in another forum. Please see you think this reasoning is ok.

The answer is c. early diastole. And here is why

during systole the cardiac muscles contract, compressing the arteries, so flow is decreased

during early diastole, the heart muscles relax and the coronary arteries dilate and the negative pressure thus generated sucks in blood from the aorta. Thus there is highest flow in early diastole in both the coronary arteries.

Negative pressure is lowest and flow highest in early diastole and tapers off as the volume in the arteries becomes occupied as well as outward swelling and pressure from the cardiac muscles begin to increase pressure in the coronary system.
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