Influence of Prosthesis Size on Change in Left Ventricular Hypertrophy Following Aortic Valve Replacement / 대한흉부외과학회지

ABSTRACT

BACKGROUND: Aortic valve stenosis induces left ventricular hypertrophy as an adaptive response to the chronic overload caused by the valve disease. Despite the fact that aortic valve replacement may lead to regression of the left ventricular hypertrophy, there is a controversy on the change of the left ventricular muscle after use of small prostheses. MATERIAL AND METHOD: We reviewed 20 patients who had undergone aortic valve replacement for aortic stenosis. There were 13 males and 7 females with a mean age of 61+/-13.8 years. A retrospective analysis of Doppler echocardiography was undertaken in preoperatively, early postoperatively(mean 10.4days), and late postoperatively(mean 29.9 months). They were divided into two groups according to the size of prosthesis used(group 1; 21 mm or smaller, group 2; 23 mm or larger). RESULT: Significant improvement of NYHA Functional class was detected in all groups. Ejection fraction was not significantly different in the group 1 between preoperative and postoperative period, however it increased significantly in the group 2 over time. But preoperative ejection fraction of the group 2 was significantly lower than that in the group 1(p=0.044). Left ventricular muscle mass index(g/m2) was not reduced significantly in the group 1 at the early postoperative period, but it was reduced significantly at the late postoperative period. In the group 2 it was reduced significantly over time. CONCLUSION: Both groups showed clinical improvement. However, the number of patients in whom 19 mm size prosthesis was used was only two. Thus, we suggest that more attention to age, BSA, and exercise should be paid in patients who will undergo aortic valve.