Circadian variation of the onset of acute myocardial infarction in the Osaka area, 1998-1999: Characterization of morning and nighttime peaks

K. Kinjo, H. Sato, H. Sato, I. Shiotani, T. Kurotobi, Y. Ohnishi, E. Hishida, D. Nakatani, H. Ito, Y. Koretsune, A. Hirayama, J. Tanouchi, M. Mishima, T. Kuzuya, H. Takeda, M. Hori

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Abstract

The onset of acute myocardial infarction (AMI) shows characteristic circadian variations; that is, a definite morning peak related to biologic rhythms and a vague nighttime peak related to socioeconomic factors. The recent economic recession in Japan may change the circadian variation, especially the nighttime peak. This study evaluated the recent circadian variation of AMI in Osaka and specified the patient subgroups showing either a morning or nighttime peak predominantly. Of 1,609 consecutive patients with AMI registered from April 1998 to January 2000, 1,252 whose onset of AMI was definitely identified were studied. The day was divided into six 4-h periods with a morning peak between 08.01 h and 12.00h, and nighttime peak between 20.01 h and 24.00h. When subgroup analysis was performed, female patients aged 65 years or more showed a morning peak alone and male patients aged less than 65 years with an occupation and the habits of cigarette smoking and alcohol intake showed a nighttime peak alone. Thus, in Osaka nighttime socioeconomic factors may currently be more potent triggers of AMI than the morning surges in younger male workers who smoke and drink.

Original languageEnglish
Pages (from-to)617-620
Number of pages4
JournalJAPANESE CIRCULATION JOURNAL
Volume65
Issue number7
DOIs
Publication statusPublished - Jul 20 2001
Externally publishedYes

Keywords

  • Acute myocardial infarction
  • Alcohol
  • Cigarette smoking
  • Circadian variation
  • Japanese
  • Trigger

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

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    Kinjo, K., Sato, H., Sato, H., Shiotani, I., Kurotobi, T., Ohnishi, Y., Hishida, E., Nakatani, D., Ito, H., Koretsune, Y., Hirayama, A., Tanouchi, J., Mishima, M., Kuzuya, T., Takeda, H., & Hori, M. (2001). Circadian variation of the onset of acute myocardial infarction in the Osaka area, 1998-1999: Characterization of morning and nighttime peaks. JAPANESE CIRCULATION JOURNAL, 65(7), 617-620. https://doi.org/10.1253/jcj.65.617