QS Study

Cardiac reserve

The capacity of the heart to generate sufficient energy for expelling a large quantity of blood and for raising blood pressure above the basal level during an emergency is called cardiac reserve. It is the potential capacity of the heart to function well beyond its basal level, in response to alterations in physiological demands. It refers to the dissimilarity between the rate at which the heart pumps blood and its utmost capability for pumping blood at any given time. A measurement of the cardiac reserve might be a health indicator for some medical condition.

  • Healthy adult: 300- 400 %
  • Athletes: 500 – 600 %
  • Heart failure: No

A measure of cardiac reserve can help predict the likelihood of heart failure when indicated. It is calculated as the cardiac output during stress minus cardiac output at rest. In the normal young adult, the resting cardiac output is about 5-6 L/min and the cardiac reserve is nearly 30 L/min.

Factor affecting Cardiac reserve

  1. lschemic heart disease
  2. Primary myocardial disease
  3. Vitamin deficiency
  4. Damage to the myocardium
  5. Valvular heart disease.