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(Chest. 1971;59:352-354.)
© 1971 American College of Chest Physicians

Effect of the Prone Position on the Phases of the Cardiac Cycle

David H. Spodick M.D.1; Athanassios P. Flessas M.D.2; and Sudarshan Kumar M.B.B.S.2

1 Chief, Cardiology Division, Lemuel Shattuck Hospital; Associate Professor of Medicine, Tufts University School of Medicine
2 Cardiology Division, Lemuel Shattuck Hospital, Assistant in Medicine, Tufts University School of Medicine

The phases of the cardiac cycles were studied in eight normal volunteers on a specially assembled table which permitted access to the precordium in the prone, as well as in the conventional supine position. There were no significant changes over supine values for mechanical systole, external isovolumic contraction time, pre-ejection components, ejection time, ejection time indices and the isovolumic relaxation preiod, despite a highly significant (p<.0001) rate increase. These differences suggest a rate effect in the prone position without concomitant changes in stroke volume or "contractility." The pulse transmission time decreased significantly between supine and prone positions in contrast to its stability in other postural changes.






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Copyright © 1971 by the American College of Chest Physicians.