第四心音

第四心音与左室功能损害及室壁的顺应性差有关。

Fourth heart sound correlated with damage of left ventricular function and compliance .

测定587例缺血性心脏病患者心音图上的第四心音（S＿4），发现S＿4的检出率为77.17%。

The fourth heart sound ( S_4 ) was studied on 587 cases of ischemic heart disease by phonocardiography . The results showed that S_4 was found in 453 patients ( 77 . 17 % ) .

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 .

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

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 % .

目的：研究第三（S3）第四（S4）心音在临床上的意义。

Objective : To find out the clinical significance of the third ( S3 ) and fourth ( S4 ) heart sounds .