Objectives The purposes of this study were to observe the prevalences of J wave in the groups of subjects and its spatial distribution characteristic on 12-lead dynamic electro- cardiogram (DECG).
Methods I assessed the prevalences of J wave among gender groups, age groups (10–49 years old, 50–59 years old, 60–69 years old and 70–99 years old) and lead groups. Meanwhile, I compared the prevalences of J wave in DECG with that in resting electrocardiogram (ECG). Statistical method selected the chi-square test.
Results The positive prevalence of J wave was 64.8% and the negative prevalence was 35.2% in female group (n = 256). The positive prevalence was 89.6% which was significantly higher in male group than that in female group (n = 202, p = 0.000), and the negative prevalence was 10.4%. There were not significant differences in positive prevalences among male age groups or among female age groups (male n = 247, p = 0.240; female n = 307, p = 0.680). The positive prevalence in V2 lead was 81% (n = 100) which was highest in 12 leads. The overall positive prevalence was 48.0% and the overall negative prevalence was 52.0% in ECG (n = 100). In DECG the overall positive prevalence was 75.8% which was significantly higher than that in ECG (n = 458, p = 0.000), and the overall negative prevalence was 24.2%.
Conclusions The study results indicate that J wave is a common ECG phenomenon in DECG. In male group the positive prevalence is significantly higher than that in female group. Neither among male age groups nor among female age groups there are significant differences in the positive prevalences. The most common localization of the J wave phenomenon is in the right precordial leads. The positive detection rate of J wave in DECG is significantly higher than that in resting ECG.
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