chest pain caused by acute myocardial infarction , unstable angina pectoris and stable angina pectoris was more likely to begin during the period from 6 am to noon than would be expected if the onset were uniformly distributed during the day ( relative risks 1.15 , 1.29 and 1.32 , respectively ) , but chest pain that was caused by nonischemic cardiac causes and by noncardiac causes was also more likely to begin during the same time period ( relative risks 1.28 and 1.17 ) .
C0155626
acute myocardial
C0018787
cardiac