心冲击图和心电图进行心率变异性分析的比较

Comparison of heart rate variability measurements between ballistocardiogram and electrocardiography

目的 通过与心电图分析方法比较,研究临床中应用心冲击图进行心率变异性（HRV）分析的可行性.方法 平静状态下同步采集21例患者的心冲击图和心电图信号,根据心冲击图波形中相邻的J峰计算出的JJ间期和心电图波形中相邻的R峰计算出的RR间期,分别计算心冲击图和心电图这两种方法在心率变异性分析中时域、频域和非线性域的测定值,分析相应测定值的相关性;并用配对f检验方法分析2组测定值之间的差异.结果 根据心冲击图和心电图方法分别进行HRV分析得到的测定值中,2组的平均正常RR间期的标准差（SDNN）、总功率（TP）、低频功率（LF）、高频功率（HF）和长轴的均方根值（SD2）数值间的相关性最高（r=1）,相邻RR间期差的均方根（rMSSD）和短轴的均方根值（SD1）、相差＞50 ms的相邻RR间期占RR间期总数的百分比（PNN50）和低频/高频比值（LF/HF）数值间的相关性均较高（r分别为0.99和0.98）,2种方法进行HRV分析得到的各项测定值差异均无统计学意义（P＞0.05）.结论 临床上可以采用基于JJ间期的心冲击图方法进行心率变异性分析.

Objective To compare the heart rate variability （HRV）measurements between ballistocardiogram （BCG） and electrocardiography （ECG）.Methods The signals of BCG and ECG of 21 patients were collected synchronously.JJ intervals of BCG and RR intervals of ECG were used to calculate the cardiac periods.The parameters of HRV analysis were calculated in time domain analysis,frequency domain analysis and nonlinear analysis.The results derived from BCG and ECG were compared.Results The parameters of HRV analysis calculated from BCG and ECG had high similarity.The correlation coefficients of SDNN,TP,LF,HF and SD2 between the BCG and ECG methods were high （r =1）.The correlation coefficients of rMSSD and SD2 were 0.99 and of PNN50 and LF/HF were 0.98 between the two methods.HRV analysis results derived from the two methods were similar （P ＞ 0.05）.Conclusion HRV could also be measured reliably by calculating the JJ interval from BCG.