Document Detail

Time of sunrise and hours with daylight may have an effect on the seasonality and diurnal variation of heart attack.
MedLine Citation:
PMID:  19781293     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: The time of onset of myocardial infarction shows seasonal and daily variation. We aimed to investigate whether the number of hours with daylight has an effect on the seasonal variation of heart attack, and whether the time of sunrise has an effect on the diurnal rhythm of myocardial infarction. METHODS: We carried out a retrospective database study covering all patients admitted to any acute care hospital with the diagnosis of myocardial infarction in Hungary between January 2004 and December 2005 (n = 32 329). Data were collected from the National Health Insurance Fund Administration (OEP) according to the International Classification of Diseases (ICD I21, I22) and National Meteorology Service (OMSZ). In case of patients who occurred in the database several times the events have been considered as a separate case. RESULTS: With consideration to seasonal variation, the peak period of heart attack was found in the spring, with the lowest number of events in the summer. The number of hours with daylight showed a weak negative correlation with the occurrence of myocardial infarction (r = -0.108, P < 0.05). With respect to diurnal variation, the peak period of daily events was between 6-12 in the morning (35.57%). We have found a positive correlation between the time of sunrise and sunset and the occurrence of myocardial infarction (P < 0.01). CONCLUSION: Based on our findings, the number of hours with daylight and the time of sunrise may be connected with the chances of having heart attack; however other factors, such as high blood pressure, diabetes or smoking may also have an influence.
Jozsef Bodis; Miklos Koppan; Imre Boncz; Ildiko Kriszbacher
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Chinese medical journal     Volume:  122     ISSN:  0366-6999     ISO Abbreviation:  Chin. Med. J.     Publication Date:  2009 Sep 
Date Detail:
Created Date:  2009-09-28     Completed Date:  2010-02-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7513795     Medline TA:  Chin Med J (Engl)     Country:  China    
Other Details:
Languages:  eng     Pagination:  2107-10     Citation Subset:  IM    
Institute of Nursing and Clinical Sciences, Faculty of Health Sciences, University of P??cs, P??cs, Hungary.
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MeSH Terms
Circadian Rhythm*
Middle Aged
Myocardial Infarction / epidemiology*
Time Factors

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