A study on standard 12-lead ECG QRS scoring system for estimating myocardial infarct size]

Using the standard 12-lead electrocardiographic QRS scoring system modified by Nancy (1985), 99 ECGs of 52 patients with acute myocardial infarction were used for estimating myocardial infarct size (MIS). One point was designed to represent 3% of the left ventricle. Each patient had the first score of ECG at the day ranged from 7 to 12 and the second 25-32 days post acute chest pain except 5 cases died before the second scoring. The results showed that the averaged score was 6.7 +/- 3.1 points accumulated from all 99 ECGs and 11.0 points from 5 cases died. There was no statistic difference between the points value of the first scoring 6.4 +/- 2.9 vs second 6.5 +/- 2.7 points, nor between the points received from Q waves 4.0 +/- 1.5 vs 3.9 +/- 1.4 points in 47 patients. There was nevertheless strong correlation both between the total points of the first and second scoring, r = 0.85 (P less than 0.0005), and those between the points related to Q wave, r = 0.81 (P less than 0.005). Furthermore, early serial serum CPK changes were determined for evaluating MIS in 25 patients, the results were compared to the first and second scores respectively, the correlations were significant, r = 0.58, P less than 0.0025 and r = 0.47, P less than 0.01.(ABSTRACT TRUNCATED AT 250 WORDS)