Cross-Sectional (n=727)
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The P-R interval can be reliably determined in routine ECGs by trained observers, with stable intra-individual repeatability over 1 year and little influence from body size, age, or heart rate.
Routine electrocardiographic tracings (ECGs) were obtained from 491 male and 236 female Norwegians. The atrioventricular conduction time (P-R interval) was read independently on coded ECGs by two physicians. The frequency distributions are presented: mean +/- 2 SD was 0.16 +/- 0.04 s and 0.15 +/- 0.04 s for males and females, respectively. Intra-individual repeatability over 1 year was high, and the measurement error was small. Within each sex, body size, age, heart rate and non-cardiac disease manifestations had little influence on the P-R interval. The P-R interval may be reliably determined in routine ECG tracings by trained observers.
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Møller et al. (1980) reported a cross-sectional. P-R interval measurement was evaluated on P-R interval frequency distribution.
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