title: [Diffeentiation of myocardial infarction by frontal 20-msec. QRS vector].
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D008433:Mathematics; D008722:Methods; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis*; D014672:Vectorcardiography