[Further studies on the factors influencing the onset of acute myocardial infarction].
Distribution of hospitalized cases of acute myocardial infarction (AMI) in ten major hospitals in Shanghai during the period of 1970-1989 was studied. A definite seasonal trend in admission rates of AMI was found, with the lowest in July and August and the peak in January, which suggested a negative relationship between number of admissions and average air temperature of the month. Onset of AMI occurred most at 6-12 o'clock in the morning, with the peaks at 8 in the morning, 2 afternoon, and 8 evening. Precipitating factors, such as physical exertion, emotional upset, could be identified in 42.03% of the patients, and existed more frequently in those occurred during the day than during the night. Based on the above findings, ways to prevent the onset of AMI were discussed in the paper.
Fan
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WH
Shanghai Cooperative Group of Acute Myocardial Infarction Huashan Hospital, Shanghai Medical University.
Dai
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RH
D000368:Aged; D002681:China / Q000453:epidemiology; D002940:Circadian Rhythm; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000453:epidemiology / Q000209:etiology*; D012621:Seasons; D013997:Time Factors