Cardiac reserve refers to the difference between the rate at which the heart pumps blood and its maximum capacity for pumping blood at any given time. A measurement of the cardiac reserve may be a health indicator for some medical condition.
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Measurements
Cardiac reserve has been measured in different ways over the history of the test.
It is possible to make a non-invasive measurement of cardiac reserve.
Significance
A measure of cardiac reserve can help predict the likelihood of heart failure when indicated.
References
Cardiac reserve Wikipedia(Text) CC BY-SA