【摘要】 目的:研究心率对心电频谱的影响。方法:在去自主传出神经的动物上,通过结扎右冠状动脉造成心肌缺血的动物模型,准确测量两心房间期(AA)和心房波与心室波间期(AV),采用快速傅立叶转换(FFT)的方法将其转换为频域函数进行分析。结果:随着AA起搏间期的缩短,AV间期的频谱变化表现为低频逐渐升高,由400ms时的(8.1±2.7)nu升至250ms时的(47.2±4.41)nu(P<0.01),高频成分则由400ms时的(85.4±6.2)nu降至250ms时的(34.7±11.4)nu(P<0.01),而高频、低频比则由10.6±3.2降至0.74±0.29(P<0.01)。在右冠状动脉阻塞情况下,起搏程序同上,此时AV间期的频谱变化表现亦为低频逐渐升高,由400ms时的(20.9±8.4)nu升至250ms时(63.4±0.1)nu(P<0.01),而高频成分由400ms时的(65.2±12.3)nu逐渐降低至250ms时的(25.8±10.5)mu(P<0.01)。其高低频比值也由3.12±2.41降至0.44±0.28(P<0.01)。结论:随着AA间期的缩短,AV频谱表现为低频逐渐升高,而高频逐渐降低。在缺血情况下,这一趋势没有改变。更多还原

【Abstract】 Objective:To study the effects of heart rate on power spectral of electrocardiogram(ECG).Methods:A model of ischemia related to ligating the right coronary artery removed autonomic nervous cats was prepared. The A-wave,H-wave and V-wave were measured from the His bundle electrocardiogram by template matching algorithm.The AA,AV(atrioventricular) intervals were measured accurately.Power spectral of ECG analysis was performed by fast Fourier transform(FFT).Results:The high flequency(HF) component of AV interval decreased from (85.4±6.2)nu to (34.7±11.4)nu and low flequency(LF) component increased from (8.1±2.7)nu to (47.2±4.4)nu when AA intervals decreased from 400ms to 250ms.And when right coronary artery occluded,HF component of AV decreased from (65.2±12.3)nu to (25.8±10.5)nu and LF component increased from (20.9±8.4)nu to (63.4±10.1)nu when AA intervals decreased from 400ms to 250ms.Conclusion:Heart rate is crucial in regulating power spectra.更多还原