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(Circulation. 1963;27:252.)
© 1963 American Heart Association, Inc.

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Hemodynamic Consequences of Oxygen Breathing in Left Ventricular Failure

WALTER J. DALY M.D.¹ ROY H. BEHNKE M.D.¹

¹ From the Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana.

As in normal men, oxygen breathing in patients with left ventricular failure is associated with a further reduction of cardiac index, partially the result of decreased stroke index and partially the result of decreased heart rate. The decrease in heart rate and cardiac index is associated with a decrease in left ventricular work index without impairing the delivery of oxygen to the tissues or the over-all tissue pO₂. In this group of patients, oxygen breathing did not result in a decreased pulmonary vascular resistance.