during the calendar years 1975 , 1978 , 1981 , and 1984 , a community-wide study in the worcester , massachusetts , metropolitan area has examined time trends in the attack and case fatality rates of acute myocardial infarction ( mi ) as well as the occurrence of out-of-hospital coronary heart disease deaths .
C0155626
acute myocardial infarction
C0018787
heart