• Am J Emerg Med · Oct 2012

    Circadian variation of acute myocardial infarction in young people.

    • Chia-Meng Chan, Wei-Lung Chen, Hung-Yi Kuo, Chien-Cheng Huang, Ying-Sheng Shen, Cheuk-Sing Choy, and Jiann-Hwa Chen.
    • Department of Emergency Medicine, Cathay General Hospital, Taipei 106, Taiwan.
    • Am J Emerg Med. 2012 Oct 1;30(8):1461-5.

    AimsThe aim was to investigate the circadian and weekly variation in Chinese young patients with acute myocardial infarction (AMI).MethodsThis was a 10-year retrospective cohort study. We studied patients (>18 to <45 years of age) with a first attack of AMI from the emergency departments of 3 university teaching hospitals in Taiwan from January 1, 2001, to December 31, 2010. We analyzed patients in the standard circadian fashion using 6-hour intervals (00:01-06:00, 06:01-12:00, 12:01-18:00, and 18:01-24:00). We also did an analysis by day of week.ResultsThe database had 505 patients with AMI with complete data. The percentage of total AMIs that occurred in the 6-hour intervals were as follows: 00:01 to 06:00, 30.9%; 06:01 to 12:00, 23.4%; 12:01 to 18:00, 25.9%; and 18:01 to 24:00, 19.8%. The percentage of AMIs between 00:01 and 06:00 was significant higher compared with that in the other three 6-hour intervals (df = 3, χ(2) = 91.7, P < .001). However, there was no significant weekly variation for these patients in the present study.ConclusionsThere was a significant circadian variation with a peak from 00:01 to 06:00 in Chinese young patients with AMI. However, there was no significant weekly variation in these patients. The circadian periodicity may create new possibilities for disease prevention and medication prescription.Copyright © 2012 Elsevier Inc. All rights reserved.

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