不同年龄段功能性室性期前收缩患儿心率变异性的观察

目的：探讨各年龄段功能性室性期前收缩患儿心率变异性（HRV）的临床意义.方法：将102例2个月至11岁频发室性期前收缩患儿按年龄段分为婴幼儿组、学龄前组、学龄组,并行24h动态心电图监测,对其HRV的变化进行分析.结果：学龄前组和学龄组的相邻R-R间期差值＞50 ms的百分数、全部正常窦性R-R间期标准差、全部相邻R-R间期差值的均方根、计算24h连续5 min一段的正常R-R间期标准差的平均数和相邻R-R间期差值的标准差均高于婴幼儿组（P＜0.05～P＜0.01）;学龄组与学龄前组相邻R-R间期差值＞50 ms的百分数差异有统计学意义（P＜0.01）.结论：小儿自主神经系统发育随年龄增长日趋完善,室性期前收缩与其自主神经功能状态及功能失衡密切相关.

Observation of heart rate variability in functional ventricular premature beat children of different ages

Objective：To explore the clinical significance of heart rate variability in functional ventricular premature beat children of different ages. Methods： A total of 102 children with functional ventricular premature beat was randomly divided into three groups according to their ages： infant group, preschool group and school-age group. The HRV time domain value was measured in all the children with 24 dynamic electrocardiograms and the results were analyzed. Results：The percentage of differences exceeding 50 ms in the adjacent normal number of intervals, standard deviation of nn intervals, rMSSD, SDANN and SDSD were significantly higher in the preschool children group and school-age group than those in the infant group （ P 〈 0. 01 ）. The PNNS0, rMSSD and SDSD were significantly different between the preschool children group and the school-age group（P 〈0.05）. Conclusious：The autonomic nervous system of children will develop with the age; ventricular premature beat is closely related with the autonomic nervous function status and imbalances.