Circadian rhythm in the cardiovascular system: chronocardiology.
BACKGROUND
We reviewed recent progress in the study of the chronobiological aspects of the cardiovascular system.


METHODS
Medline was used as the main search tool, and the full texts of selected papers were obtained.


RESULTS
More than 300 references were found, and 52 of them, representing the major findings in this field, were included in the reference list. Results of these studies confirm that most cardiovascular physiological parameters (such as heart rate, blood pressure, electrocardiogram indices) and pathophysiological events (myocardial ischemia/infarction, sudden cardiac death) show circadian rhythms. Results also suggest that consideration of these rhythms is important for the diagnosis and treatment of cardiovascular disorders and that restoration of normal circadian rhythms may be associated with clinical improvement.


CONCLUSIONS
The study of circadian rhythms in the cardiovascular system is emerging as an important area of investigation because of its potential implications for patient management.
Guo
Yi-Fang
YF
Cardiology Division in Geriatric Institute, Hebei Provincial People's Hospital, Shijiazhuang, China. guoyifang@hotmail.com
Stein
Phyllis K
PK
D001145:Arrhythmias, Cardiac / Q000503:physiopathology; D001794:Blood Pressure / Q000502:physiology; D002302:Cardiac Output / Q000502:physiology; D002395:Catecholamines / Q000097:blood; D002940:Circadian Rhythm / Q000502:physiology*; D003331:Coronary Vessels / Q000502:physiology; D004730:Endothelium, Vascular / Q000502:physiology; D006339:Heart Rate / Q000502:physiology; D006487:Hemostasis / Q000502:physiology; D006801:Humans; D009203:Myocardial Infarction / Q000503:physiopathology; D017202:Myocardial Ischemia / Q000503:physiopathology*; D012084:Renin-Angiotensin System / Q000502:physiology; D014655:Vascular Resistance / Q000502:physiology
D002395:Catecholamines