Analysis of time statistics of extreme variations of heart beat fluctuations

We analyzed heart beat fluctuations in terms of return times of extreme values of the RR increments. We considered 24 hours Holter ECG signals of 90 healthy individuals and 90 unhealthy ones suffering of congestive heart failure (chf). The increment time series RR corresponding to sleep and daily activity were studied separately. In both cases, our results pointed out strong differences in the median return times of the positive high thresholds between healthy and unhealthy people.

我们基于RR间期增量（RR increments）极值的返回时间分析了心跳波动。我们纳入了90名健康个体与90名患有充血性心力衰竭（congestive heart failure, CHF）的非健康个体的24小时动态心电图（Holter ECG）信号。我们分别研究了对应睡眠与日常活动的RR间期增量时间序列。在两种情况下，我们的结果均表明健康人群与非健康人群在正高阈值的中位返回时间上存在显著差异。