Prediction of Prognosis of Acute Inferior Wall Myocardial Infarction by Admission Electrocardiograms

Abstract

The purpose of the study is to obtain ECG findings in the acute stage of infarctions that reflect short-term prognosis of inferior infarctions. The subjects were 222 patients with first acute inferior infarctions without conduction disturbances such as bundle branch block. In ECGs on admission, the Q wave amplitude at the II, III and aVF leads, the amplitudes of the R and S waves at leads VI and V2, the ST segment deviation at all leads except aVR were measured and the results were compared between living and deceased cases. Thirty-six patients (16.6%) died of cardiac disease during hospitalization. Among the ECG parameters on admission, the highest sensitivity for differentiation of living and deceased cases was ST deviation in lead I (STI)≤-1mm(72.2%), followed by STII-STIII≤-1mm (66.7%), and ST deviation at V6 (STV6)≤-1.5 or ≥1mm (63.9%). The specificity was highest for STV6 ≥1mm (73.7%). The diagnostic accuracy was highest for STV6 ≥1mm (77.7%). In a logistic analysis, STI≤-1mm and SST (V4 to V6)≤-3.5mm were extracted as independent factors in in-hospital deaths.