Seasonal variability of QT dispersion in healthy young males

Sedat Kose, Kudret Aytemir, Ilknur Can, Atilla Iyisoy, Hurkan Kursaklioglu, Basri Amasyali, Ayhan Kilic, Ersoy Isik, Ali Oto, Ertan Demirtas

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Background: There are few data related to the seasonal influences on the QT dispersion. Methods: We analyzed the effects of seasons on QT dispersion in a large group of healthy young males. We studied the seasonal variability of QT dispersion in 523 healthy male subjects aged 22 ± 4 years (ranging from 20 to 26). Four seasonal 12-lead resting electrocardiograms (ECGs) recorded at double amplitude were performed at 25 mm/s at intervals of 3 months. Subsequent ECGs were recorded within 1 hour of the reference winter recording. QT dispersion was defined as the difference between the longest and the shortest mean QT intervals. Results: There was a significant seasonal variation in QT dispersion (P = 0.001), with the largest QT dispersion in winter (71 ± 18 ms) and the smallest one in spring (43 ± 19). Conclusion: There exists a significant seasonal variation in QT dispersion of healthy subjects and such variability should be taken into consideration in the evaluation process of QT dispersion.

Original languageEnglish (US)
Pages (from-to)8-13
Number of pages6
JournalAnnals of Noninvasive Electrocardiology
Issue number1
StatePublished - Jan 2003


  • QT dispersion
  • QT interval
  • Seasonal variation


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