sixty male survivors of acute myocardial infarction in the week after the chicago blizzard of jan 15 , 1979 , were matched by hospital and sex with 60 myocardial infarction survivors from a week without snowfall to determine whether a history of previous heart disease or of cardiac risk factors increased the risk of a postblizzard myocardial infarction .
C0018787
cardiac
C0027051
myocardial infarction