Background: Various clinical manifestations of
cardiovascular diseases have a pattern of circadian variation. In this
study, we investigated whether the onset and duration of paroxysmal
supraventricular tachycardia (PSVT) has a circadian
Methods and results: In our analysis, we
included 105 patients with 498 PSVT episodes. In this study, the onset
of PSVT did not have a uniform distribution throughout the 24-h period.
There were nearly equal peaks in the time periods from 8:00 to 9:00
am, 12:00 to 1:00 pm, and 5:00 to 6:00
pm, with a trough at night. The duration of PSVT also did
not show a uniform distribution throughout the 24-h period; it
increased significantly during the daytime, with a peak between 1:00
and 2:00 pm, another peak between 6:00 and 7:00
pm, and a significant reduction at night.
Conclusions: The onset and duration of PSVT showed a
circadian variation. However, the time-oriented antiarrhythmic therapy
for preventing PSVT needs further study.
Abbreviations: PSVT = paroxysmal supraventricular