Correlation between Wall Motion Score Index (WMSI) and Anatomical M-mode (AAM) Systolic Thickening with Functional Capacity in Heart Failure among Post-myocardial Infarction Patients

Abstract

Abstract Exercise capacity among cardiac patients is not sufficiently predicted using left ventricular ejection fraction resting measurement. The echocardiographic measurement using Wall Motion Score Index (WMSI) and Anatomical M-mode (AAM) Systolic Thickening post-myocardial infarction was studied to determine its correlation with functional capacity. We conducted a cross-sectional study of 33 consecutive post-MI patients. The inclusion criteria included heart failure patients with NYHA class I-II visiting the cardiology outpatient clinic of Soetomo Hospital, Surabaya. A resting echocardiogram, measuring WSMI and AMM systolic thickening of basal and mid-LV segments, was taken. The patients underwent a treadmill stress test using the Naughton protocol on the same day of their echocardiography examination. Samples were then analyzed using SPSS 2.0. Study subjects were 69.7% males with age 58.45±6.2 years old and BMI 24.07±3.2 kg/m2. The proportion of hypertension was 60.6%, smoking 51.5%, diabetes mellitus 42.4%, and dyslipidemia 42.4%. WMSI was 1.68±0.45, mean AMM systolic thickening 39±13%, and exercise capacity 3.69±1.8 METs. There was a moderate negative correlation of WMSI and a moderate positive correlation of AMM systolic thickening with functional capacity (r = –0.466, r = 0.415 consecutively; p<0.05). WMSI and AMM systolic thickening were correlated with functional capacity in post-MI patients with heart failure.