P INTERVAL DISPERSION AND ITS
CORRELATION FACTORS AMONG HEALTHY CHINESE
Wang C, Xie Z-W, Li M-X, Lin P, Cao M-J, Xu
Y，Deng C-B
Department of
Cardiovascular Pediatric，
The 2nd Affiliated Hospital of
XiangYa Medical College of Central Southern
University, Changsha, Hunan, China
Objective: To establish mean value of P
interval dispersion of 12-lead simultaneous body surface electrocardiogram
in healthy Chinese and to make correlative factor analysis.
Methods:
12-lead
simultaneous body surface electrocardiogram data were taken from 2078
healthy Chinese aged 1 to 87 (39.4±17.3) years with SR-1000A automated
electrocardiography made by Guangdong Zhongshan of China. These data were
saved in the floppy disk. The expert analysed replayed electrocardiogram on
the screen. Amplitude was magnified 1mV=20 / 40mm and paper speed was
increased to 50 / 100mm/s. Pmax and Pmin were
calculated as Pd (Pmax—Pmin) and corrected
by Bazett's formula as Pcd (Pcmax—Pcmin).
Results:
Mean value of Pmax,
Pmin， Pd and Pcd has tendency to be prolonged and Pcmax
and Pcmin has trend to be shortened with increasing of age, but
without significant difference in age and sex. In 1～87 years mean value of Pmax
was 109.85±7.88ms, Pmin was 80.97±11.42ms, Pcmax was
123.13±12.00ms, Pcmin was 90.85±14.40ms, Pd was
28.89±10.74ms and Pcd was 32.39±12.10ms, and in 1～14 years children mean value were： Pmax（101.54±9.49）ms，Pmin（76.85±10.19）ms，Pd(24.82±7.51)ms and Pcd
(31.10±9.89)ms. 77.04% and 14.39% of Pmax were in Ⅱ lead and V5 lead and
74.69% and 7.84% of Pmin were in V1 lead and V2
lead.
Conclusions: The mean values of Pmax
is 96～120ms and Pd is 8～50ms and Pcd is 10～56ms among healthy Chinese. Pd
shows no significant correlation with heart rate and age and sex.