Left Ventricular Systolic Function Improvement after Surgical Revascularization in Postinfarction Angina

Yi, Gijong; Park, Seong Yong; Lim, Sang Hyun; Hong, You Sun; Yoo, Kyung Jong; Chang, Byung Chul

Abstract

BACKGROUND: Acute myocardial infarction (MI) is a life-threatening disease and surgical revascularization plays a major role in selected cases. The purpose of this study is to evaluate the left ventricular contractility improvement by examining the wall motion score index (WMSI) and left ventricular ejection fraction (LVEF) in patients who underwent surgical revascularization under diagnosis of acute MI. MATERIAL AND METHOD: From January, 2001 to December, 2004, 149 patients who underwent coronary artery bypass surgery within 2 weeks of acute MI were included. We evaluated pre- and postoperative left ventricular contractility by measuring WMSI and LVEF and examined the associating factors. RESULT: WMSI decreased from 1.54+/-4.30 to 1.43+/-0.40 (p<0.001) and LVEF increased from 48.1+/-12.2% to 49.7+/-12.3% after surgery (p=0.009). Off-pump technique, non-Q wave, anterior MI, and surgery within 7 days after MI were favorable factors for LVEF improvement (p=0.046, p=0.006, p=0.003, p= 0.005, respectively). Conversely, aforementioned factors were irrelevant with WMSI improvement. For triple vessel disease, complete revascularization was favorable factor for WMSI improvement (p<0.001).
CONCLUSION
Coronary artery bypass surgery can improve WMSI and LVEF in patients with acute MI. In case of anterior MI with non-Q wave, early surgical revascularization within 7 days may be most beneficial in LVEF improvement. Regarding WMSI, complete revascularization may be essential.