Between November 1991 and December 1993, twelve patients(Male: w, Female: 10) who had mitral valve disease without primary pulmonary disease underwent mitral valve replacement. The pulmonary function test(PFT) was performed preoperatively and
postoperatively (mean, 9 months after operation). Mitral valve replacement was indicated for mitral stenosis in 9 patients and for mitral stenosis in 9 patients and for mitral insufficiency in 3 patients. Preoperative NYHA functional class were
III
in
11 patients and class IV in l patient. Postoperatively, ten patients(83%) were classified into NYHA functional class I. There was a significant decrease in cardiothoracic ratio(CTR) postoperatively(P<0.05). The pulmonary function before operation
was
low compared with predicted values in vital capacity(VC) and forced mid-expiratory flow(FEF 25~75%). The FEF25%-75% ad maximal voluntary ventilation(MVV)were low compared with predicted values postoperatively. There was no significant difference
in
the
pulmonary function before and after operation. Twelve patients were divided into 2 groups according to the early postoperative NYHA functional class. In class I group, the postoperative pulmonary function was significantly improved in 6
parameters
(RV,
FRC, TLC, FEV1, FEV1/FVC, and FEF 25~75%), but in class II group, there was no significant change in the pulmonary function after operation.
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