Objective To study heart rate variability (HRV) during night sleep in children with myocarditis. Methods The HRVs of 44 children with myocarditis and 60 normal children were monitered at night and in 24 hours. Results The children wilh myocarditis had higher heart rate, lower HRV, lower SDNN than the normal children; minimum and average heart rate in the children with myocarditis is higher than the normal ones, while the 24 hour maximum heart rate of the children with myocarditis did not differ from the normal ones. Conclusions The HRV of children with myocarditis is lower than normal children at night, a time period free of influence of emotion and activity in the daytime, and thus provides more reliable data.%目的 研究心肌炎患儿夜晚睡眠期心率变异(HRV)变化.方法 监测44例心肌炎患儿和60例正常对照儿童的24h和睡眠期HRV.结果 心肌炎患儿夜晚睡眠期心率高于正常对照儿童,而连续正常R-R间期的标准差(SDNN)低于正常对照儿童,差异均有统计学意义(P均＜0.05)；心肌炎患儿24h HRV时域和频域指标均低于正常对照儿童,差异有统计学意义(p均＜ 0.05).结论 心肌炎患儿的HRV指标降低；夜晚睡眠期HRV排除了日间情绪及活动等因素的影响,其结果更可靠.
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