evaluation of 56 clinical variables available during initial assessment indicated that infarction patients could be distinguished from others by the presence of left ventricular hypertrophy ( p less than 0.01 ) , electrocardiographic evidence of old myocardial infarction ( p less than 0.01 ) , typical cardiac chest pain ( p less than 0.01 ) , and duration of cardiac symptoms less than 4 hours ( p less than 0.05 ) .
C0155668
old myocardial infarction
C0018787
cardiac