The value of ST elevation and STIII/II>1 in acute inferior wall infarction for diagnosing the right ventricular infarction

Objective To evaluate the diagnostic value of the ST elevation and STⅢ/Ⅱ1 in acute inferior wall infarction complicated by right ventricular infarction. Method The routine 12 channels and V 3R ～V 7R leads were used. connecting 2 consecutive TP lines of QRS complex as the base line, the amplitudes of ST elevation at 80 ms post J point of each lead of Ⅱ. Ⅲ. V 3R ～V 7R were measured. Result Of 24 cases, we found the ST elevation of lead Ⅲ0 1 mv and STⅢ/Ⅱ1, among them 18 cases(75%) were complicated by right ventricular infarction. Only 2 patients of the another 24 cases with STⅢ/Ⅱ≤1 were complicated with right ventricular infarction. The difference between the 2 groups was very significant ( P0 001 ). The sensitivity. specificity and accuracy rates were 90%, 78% and 77% respectively. Conclusion In the early stage of acute inferior wall infarction, the ST elevation and STⅢ/Ⅱ1 is an reliable index for early recognition of its complication with right ventricular infarction. The sensitivity of this index is almost equivalent to that of the STV 4R elevation for the diagnosis of right ventricular myocardiac infarction.