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We evaluated a simplified version of a previously developed QRS scoring system for estimating infarct size using observations of Q-and R-wave durations and R/Q and R/S amplitude ratios in the standard 12-lead ECG. Groups of subjects with a minimal likelihood of having myocardial infarcts and minimal likelihood of having common noninfarction sources of QRS modification were studied to establish the specificity of each of the 37 criteria. Only two criteria required modification to achieve 95%doi:10.1161/01.cir.65.2.342 pmid:7053893 fatcat:mtdb3lkjozbprbytyi57w7ftje