第三心音

研究第三心音（S3）在临床上的意义。在心前区采集心音数据，并采集一导心电信号来定位心音。

In order to find out the clinical significance of the third heart sound ( S3 ), the heart sound data was sampled at the precardium and lead I of ECG was recorded simultaneously to label heart .

正常人与冠心病患者的第三心音分析

The Third Heart Sound Analysis of Normal and Aiged with Coronary Heart Disease

第三心音和第四心音对预测左室功能不全具有低度敏感性和中高度特异性

Third and fourth heart sounds had low sensitivity but moderate to high specificity for predicting left ventricular dysfunction

69例心室按需型起搏器安置后有40%第三心音消失，58%收缩期杂音减弱，35%增强。

In 69 patients with VVI pacemakers , S 3 disappeared in 40 % , systolic murmur ( SM ) decreased in 58 % and increased in 35 % patients .

结果显示，本算法对正常心音以及包含心音分裂和第三心音、第四心音的心音样本的正确识别率为100%；

The result shows that the accuracy of recognition of normal heart sound is 95.1 % and that of heart sound samples , which include split S1 , split S2 , S3 , and S4 , is 100 % .

心音图第三、四心音与左心室功能客观测值的关系

Association between phonocardiographic third and fourth heart sounds and objective measures of left ventricular function

老年人第三第四心音信号小波变换时频分析研究

A Wavelet Transform Time Frequency Analysis of the Third and Fourth Heart Sound of Old People

用小波变换时频分析的方法对老年人的第三第四心音进行了分析研究，在心前区采集心音数据，为对心音定位，同步采集了一导心电信号。

The wavelet transform time-frequency analysis method was used to detected the S3 and S4 . The heart sounds data was sampled at the precardium , and Lead I of the ECG was recorded simultaneously to label the heart sounds .