Seasonal variation of P-wave dispersion in healthy subjects.
We studied the seasonal variability of P dispersion in 523 healthy male patients, aged 22 +/- 4 years (range, 20-26). Four seasonal 12-lead resting electrocardiograms were recorded at 2 mV/cm standardization and at 50 mm/s paper speed at intervals of three months. Electrocardiograms were recorded between the hours 10 to 12 AM. The difference between the maximum P-wave duration and minimum P-wave duration was calculated and defined as "P dispersion." There was a significant seasonal variation in the maximum P-wave duration (P = .001) and P dispersion (P = .001), with the longest maximum P-wave duration (121 +/- 16 ms) and P dispersion (41 +/- 7 ms) observed in winter and the shortest maximum P-wave duration (106 +/- 15 ms) and P dispersion (24 +/- 8 ms) observed in summer. The minimum P-wave duration did not show any significant seasonal variation. In conclusion, there exists a significant seasonal variation in the maximum P-wave duration and P dispersion in healthy patients. Seasonal variation of P dispersion resulted from the significant variation of maximum P-wave duration.
Kose
Sedat
S
Department of Cardiology, Gülhane Military Medical Academy, Etlik, Ankara, Turkey. aiyisoy@hotmail.com
Aytemir
Kudret
K
Can
Ilknur
I
Iyisoy
Atilla
A
Kilic
Ayhan
A
Amasyali
Basri
B
Kursaklioglu
Hurkan
H
Isik
Ersoy
E
Oto
Ali
A
Demirtas
Ertan
E
D000328:Adult; D004562:Electrocardiography; D005500:Follow-Up Studies; D006329:Heart Conduction System / Q000502:physiology*; D006801:Humans; D008297:Male; D008889:Military Personnel; D012016:Reference Values; D012621:Seasons; D014421:Turkey