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E-ISSN : 2148-9696
Crescent Journal of
Medical and Biological Sciences
Jan 2019, Vol 6, Issue 1
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Original Article
Circadian Rhythms and Seasonal Incidence in Cardiac Arrhythmia in Cardiovascular Patients
Mohsen Abbasnezhad1, Ahmad Separham1, Golnesa Shahnazarli2, Hossein Namdar1, Bahman Akhondi1
1Cardiovascular Research Center, Tabriz University of Medical Sciences,, cardiology, Tabriz, Iran
2Faculty of Nursing and Midwifery, Tabriz University of Medical Sciences, Midwifery, Tabriz, Iran

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Keywords : Circadian rhythm, Seasonal incidence, Cardiac arrhythmia
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Objectives: Cardiovascular diseases are one of the most common causes of inability and mortality in most of the  countries. External and internal factors especially circadian rhythms can play a significant role in the incidence of heart attacks and supraventricular arrhythmias.

Various changes in biological conditions of body cause these rhythmic changes and circadian  cycles and seasonal incidence. The incidence of cardiac arrhythmias decreases and increases   during the day and night and also different seasons, and night-time and night sleeps are the times when the incidence would be decreased.

Materials and Methods: This study was a descriptive- research. Statistical population consisted of patients who referred to Emergency Room(ER) and inpatient centers of Shahid Madani teaching hospital of Tabriz. A total number of 722 patients were examined from September 2008 to September 2010. Data were analyzed in SPSS version16.

Results: Type of arrhythmia was atrial fibrillation (AF) in 480 people (63%) and none-AF in 292 (37%). As to seasonal distribution of arrhythmia, the highest incidence rate was 225 (29.1%) in spring. In terms of the hour of incidence, arrhythmias were recorded during 00.00-4.00 (10. 2%), 4.00-8.00 (5.4%), 8.00-12.00 (34.9%), 12.00-16.00 (19.9%), 16.00-20.00 (16.5%) and 20.00-24.00 (12.6%).

Conclusion: Changes in seasonal circadian rhythms play a role in the incidence of supraventricular arrhythmic attacks. It is likely that internal hormonal and biochemical changes due to circadian cycles and seasonal changes affect the incidence of supraventricular arrhythmia and that identification of these seasonal and circadian rhythms can have important practical applications.


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