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The Journal of Thoracic and Cardiovascular Surgery, Vol 93, 675-679, Copyright © 1987 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

The feasibility of closed mitral valvotomy in pregnancy

S Vosloo and B Reichart

Rheumatic mitral valve stenosis is an important nonobstetric complication of pregnancy in an African country. Between January 1965 and September 1985 41 closed mitral valvotomies with a Tubbs dilator were performed in 39 pregnant women (two first trimester, 22 second trimester, and 17 third trimester). All patients experienced symptomatic improvement from New York Heart Association Class 3.01 (average) preoperatively to 1.22 postoperatively. There were no deaths related to the operation and delivery. Fetal deaths were due to postoperative spontaneous abortion in two cases (4.9%) or premature labour in three cases (7.3%), for an overall survival of 36 babies (87.8%). Fetal morbidity was due to prematurity or dismaturity in three infants, all of whom survived. Thirty-three normal infants were delivered at term. Nine patients needed subsequent surgical procedures for mitral valve restenosis 5 to 17 years (mean 10.2 years) after the initial closed valvotomy: Repeat closed valvotomy was performed in three patients after 5, 8, and 10 years (the first two during subsequent pregnancies), an open procedure was performed in one after 6 years, and five patients underwent subsequent mitral valve replacement after 11 (two), 12 (two), and 17 (one) years. Two late deaths occurred; one after 10 years, as a result of pneumonia and meningitis, and the other after 12 years, before a mitral valve replacement for restenosis could be performed. None of the remaining patients has required further surgical procedures, but two have moderate symptoms. Closed mitral valvotomy gives satisfactory results in pregnant patients with severe mitral stenosis. When indicated during pregnancy, it should be performed at any stage of the pregnancy.

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