Abstract

In dogs the effects of acute myocardial infarction (AMI) on right and left heart pressure relationships were studied. Right atrial pressure was a poor predictor of left heart pressures. Pulmonary artery end-diastolic, left atrial, and left ventricular end-diastolic pressures tended to equalize in normals (except with tachycardia) and after AMI. In a previously scarred left ventricle, however, after superimposed AMI and marked elevations in left ventricular end-diastolic pressure, prominent atrial impact waves resulted in this being appreciably higher than the other two pressure measurements.

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