Relationship of various QRS indices to SGOT levels in acute anterior myocardial infarction.

In 52 first myocardial infarction which were anterior in location, several QRS indices derived from measurements of precordial QRS complexes using their correlation with highest recorded value of serum glutamic oxaloacetic transaminase (SGOT). The sum of R amplitudes in V1 to V6 inclusive (3r V1-6) was preferred over indices which included measurements of Q amplitude or duration because it was simpler to calculate and most frequently showed the best significant correlation with SGOT both in the presence or absence of radiologic evidence of pulmonary congestion. Furthermore calculation of change from normal values of precordial R amplitudes did no improve the correlation. Thus 3r V1-6 perhaps as a reflection of amount of loss of myocardial muscle mass is a quantitative ECG approach which correlates with severity of myocardial infarction and should receive more attention in evaluation of infarct size in man.