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Significance of the contribution of atrial systole to cardiac function in man

  • Alberto Benchimol
    Correspondence
    Address for reprints: Alberto Benchimol, M.D., Institute for Cardiovascular Diseases, Good Samaritan Hospital, 1033 E. McDowell Rd., Phoenix, Ariz. 85002.
    Affiliations
    From the Institute for Cardiovascular Diseases, Good Samaritan Hospital, Phoenix, Ariz., USA
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      Abstract

      Under certain conditions atrial contraction may contribute to an increase in cardiac output and may enhance over-all cardiac performance in man. The increase in flow and pressures resulting from atrial contraction is variable, depending on the functional capacity of the atria and ventricles and also on the basic pathologic condition. Atrial contribution in man appears to be more significant during exercise, during fast heart rates and particularly in patients with heart disease.
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