心音图运动试验中的信噪比分析

为了验明ＰＣＧＥＴ方法的可信度,作者进行了该心音图运动试验中的信噪比分析。对３０个志原者进行了ＰＣＧＥＴ,运动后基带幅值的平均值与运动前基带幅值平均值的比值为１．１５０;各受试者运动后ＳＩ幅值对运动前ＳＩ幅值的倍数的平均值为１０．５７,这表明,ＰＣＧＥＴ提高了信／噪比,心内噪声、心胸系统传播过程中产生的噪声、呼吸噪声、肌肉噪声和环境噪声没有防碍ＰＣＧＥＴ的应用。ＰＣＧＥＴ可作为心力储备的无伤性、简

An Analysis of S/N Ratio of the Phonocardiogram Exercise Test

Phonocardiogram exercise testing (PCGET) is a method through applying a phonocardiograph to evaluate cardiac contractility and the cardiac reserve.In order to test the certainty of PCGET method,a study on its S/N ratio was performed.Thirty volunteers performed PCGET.The average value of baseline amplitudes after exercisc with respect to the average value of baseline amplitudes before exercise is 1.150;The average value of number of time of the S1 amplitude after exercise with respect to the S1 amplitudes before exercise is 10.57.The results suggest that PCGET has increased S/N ratio; introcardiac noise,noise from transmission of heart/thorax acoustic system,respiratory noise, muscle noise and ambient noise could not interfere in the application of PCGET.PCGET might be a noninvasive,convenient,and inexpensive technique to quantitatively evaluate cardiac reserve for abnormal or normal persons.