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(Chest. 1971;60:98-101.)
© 1971 American College of Chest Physicians

Mitral Insufficiency As A Right Ventricular Afterload

Walter H. Herbert M.D.1

1 Associate Director, Cardiopulmonary Laboratory, Grasslands Hospital, Valhalla, New York

Patients with "pure" mitral stenosis (MS) were shown to have significantly lower ratios of pulmonary artery pulse pressure to pulmonary artery end-diastolic pressure (PP/PAEDP) than patients with pure mitral insufficiency (MI) (p < 0.001). An analysis of the simultaneous right and left heart pressure studies suggested that the wider PP of the MI group is related to a right ventricular afterload phenomenon. Mitral insufficiency causes an increase in pulmonary blood mass and inertia at the time of right ventricular systole. It is concluded that left heart systolic events may be reflected in the pulmonary artery.






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Copyright © 1971 by the American College of Chest Physicians.