The onset of symptomatic atrial fibrillation and paroxysmal supraventricular tachycardia is characterized by different circadian rhythms

Abstract Circadian patterns have been demonstrated for several biologic phenomena including cardiovascular diseases such as acute myocardial infarction and sudden death. 1 Diurnal distribution of paroxysmal supraventricular arrhythmias has been less extensively investigated, 2,3 but only data on hospitalized patients are available. The aim of this study was to find if a diurnal distribution could be identified in the occurrence of the different types of symptomatic supraventricular arrhythmias in patients rescued at home by the Florence Mobile Coronary Care Unit.