[Precordial mapping and enzymatic analysis for estimating infarct size in man. A comparative study (author's transl)].

To investigate the relationships between electrocardiographic and enzymatic indexes of infarct size (I.S.), a group of 19 patients with anterior infarction was studied by serial precordial mapping and CPK curves analysis. The time course of ST and QRS changes was examined and a sharp, spontaneous fall of sigmaST was shown to occur within 10-12 hours after onset of symptoms, followed by a gradual rise. sigmaST on admission appears to be a poor predictor of subsequent enzymatic I.S. (r=0.49). Good correlations with I.S. were observed, for sigmaST at 48-96 hours (r=0.82) and, especially, for the percent decrease of sigmaR, with respect to the initial values (deltaR%), (r=0.94).