Đánh giá sự biến đổi chức năng thất trái sau phẫu thuật bắc cầu nối chủ vành ở những bệnh nhân thiếu máu cơ tim cục bộ mạn tính bằng phương pháp siêu âm Doppler mô

Background: The aim of this study was to determine the change of regional myocardial function in patients with chronic stable angine after coronary artery bypass grafting by tissue doppler imaging. Method: Using pulsed wave Doppler tissue imaging, LV and RV function was studied in 37 patients with chronic stable angine before and after CABG Myocardial velocities were recorded at the lateral, septal, posterio anf anterior angles of the mitral annulus as well as the tricuspid annulus at the free wall of RV. Result 37 consecutive patients with chronic stable angine and preserved left ventricular function undergoing CABG were studied. The conventional echoccardiography index were unchanged after CABG.Compared with preoperative values, systolic peak velocity and early diastolic velocity of mitral annulus improved at all sites of left ventricular (p0.001 for each).But the systolic and early diastolic velocity of tricuspid annulus were significantly reduced after CABG compared with preoperative measurement. (p0.001). Conclusion: TDI showed a marked improvement in systolic and diastolic LV function after CABG. Unlike the left ventricle, RV function as assessed by tricuspid annulus velocity decreased significantly after CABG.