[Surgical results of aortic stenosis with or without left ventricular dysfunction--postoperative change of left ventricular function].

Between January 1980 and December 1992, 82 patients with aortic stenosis underwent isolated aortic valve replacement at our institution. Age of the patients ranged from 26 to 72 (58 +/- 6.4) years, and 58 were men and 24 were women. The patients were divided into two groups according to preoperative left ventricular ejection fraction (LVEF): 23 patients (LVEF < 50%, mean 39.7%; Group D) and 59 patients (LVEF > or = 50%, mean 62.6%; Group N). By means of echocardiography, LV function were evaluated before and at one month after operation in terms of left ventricular fractional shortening (LVFS), left ventricular systolic internal diameter (LVIDs), left ventricular mass index (LVMI), and left ventricular end systolic wall stress (ESWS). Postoperative early mortality including hospital death was 8.7% in group D (2 cases; myocardial infarction 1, cerebral complication 1) and 3.3% in group N (2 cases; myocardial infarction 1, low output syndrome 1), and this difference was not significant (NS) between two groups. The 5- and 12-year actuarial survival rate were 87.8% and 87.8% in group D, 91.5% and 87.6% in group N, respectively (NS). LVFS (pre/post) was 0.25 %/- 0/08/0.24 +/- 0.10 in group D, 0.38 +/- 0.10/0.32 +/- 0.10 in group N. The difference were significant before (p < 0.0005) and after (p < 0.005) operation between two groups. LVIDs (mm; pre/post) were 39.0 +/- 7.9/35.0 +/- 9.6 in group D, 28.7 +/- 7.3/229.3 +/- 7.6 in group N. The difference were significant before (p < 0.0005) and after (p < 0.01) operation.(ABSTRACT TRUNCATED AT 250 WORDS)