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A 40-year-old member asked:

What is the percentage of cardiac output delivered to the heart?

2 doctor answers4 doctors weighed in
Dr. Louis Grenzer
Cardiology 55 years experience
About 4%: About 4% of the cardiac output goes to the heart muscle itself. That is the same either at rest or with exercise.
Dr. Paul Cohen
Dr. Paul Cohen commented
Family Medicine 28 years experience
Right on!
Dec 24, 2011
Dr. Calvin Weisberger
Cardiology 51 years experience
Cardiac output: The major organs get about 80% of the total co. The percent each gets varies depending on the dynamics going on. As the heart can vary its resistance markedly coronary blood flow can vary by a factor of 5 depending on heart rate and resistance so it isn't a constant percent of co.

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A 37-year-old member asked:

How does the heart increase cardiac output?

2 doctor answers3 doctors weighed in
Dr. Louis Grenzer
Cardiology 55 years experience
Two ways: Either by pumping out more blood with each beat (by squeezing harder) or by beating faster. The output is the heart rate times the stroke volume. (the amount of blood pumped out with each beat).

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Last updated Dec 8, 2016

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