Circadian Rhythm of Atrial Fibrillation [Turk Kardiyol Dern Ars]
Turk Kardiyol Dern Ars. 1995; 23(2): 82-85

Circadian Rhythm of Atrial Fibrillation

Y. Ahmet ÜNALIR1, Y.Necmi ATA1, Bülent GÖRENEK1, Sevda KESMEN1, Bilgin TİMURALP1

We studied if there is a circadian heart rate variability in patients with atrial fibrillation as exists in patients with normal sinus rhythm. 34 patients with atrial fibrillation (24 female, average age 59±19) and, as a control group, 10 patients with sinus rhythm were included. In most patients with atrial fibrillation the underlying etiology was determined (valvular heart disease, coronary heart disease, cardiomyopathies, hyperthyroidism). Antiarrhythmic agents, except digoxin, were stopped at least one week before the study. Ambulatory electrocardiographic monitoring was performed in all patients for 24 hours. Except for the 3.00-6.00 a.m. period. mean heart rates of patients with atrial fibrillation and of those with sinus rhythm were similar. Mean heart rates measured in the 6.00-9.00 a.m. period were significantly higher than during other hours (except 9.00-12.00 a.m. period). We found this peak to differ from previous studies. We concluded that similar heart rate variabilities occur in patients with atrial fibrillation and those with normal sinus rhythm.

Keywords: Atrial fibrillation, the circadian rhythm

How to cite this article
Y. Ahmet ÜNALIR, Y.Necmi ATA, Bülent GÖRENEK, Sevda KESMEN, Bilgin TİMURALP. Circadian Rhythm of Atrial Fibrillation. Turk Kardiyol Dern Ars. 1995; 23(2): 82-85
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