Heart Sound


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Heart Sound

 

the sound accompanying heart function. Occurring at regular intervals during specific phases of the cardiac cycle, heart sounds are rapid aperiodic sound oscillations.

Two basic heart sounds are distinguished during auscultation of the heart and phonocardiography. The first sound, which occurs at the beginning of the systole, is caused by myocardial tension, valve function, and the vibration of the walls of major vessels. The second sound occurs with the closure of the semilunar valves at the beginning of the diastole. A physiological third sound is often detected in children and adolescents.

A change in the nature or number of heart sounds, such as the occurrence of palpitations, may indicate the development of heart failure or the existence of heart disease or certain other afflictions.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Encouraged by the results of utilizing convolutional neural networks (CNNs) for the purpose of extracting features from EEG signals to classify neural disorders in our previous work [21], in this paper, we are proposing a new method for the automatic segmentation of heart sound signals collected in highly variable conditions using deep CNNs.
Auscultation revealed mild wheezing throughout the upper lung fields and loud heart sounds throughout his chest that were audible even with gentle contact of the stethoscope diaphragm.
The HSS used in this study is normal, which consists of the first heart sound (S1) and murmurs (shown in Figure 1).
Labour was monitored carefully with strict watch on foetal heart sound, progress of labour, maternal vitals, abdominal girth/fundal height charting, bedside coagulation profile and intake output charting was done.
In this study, for the first time in the literature, it was investigated whether sleep apnea could be detected automatically from heart sounds by teaching various classifiers of time and frequency plane parameters which are thought to be able to characterize the morphological changes seen in heart sounds during apnea.
Statistical signal processing methods were proposed to filter out any noise in the respiratory sound signal, as well as, different approaches based on adaptive filtering [5-7] and time-frequency filtering [7,8] were applied to remove the heart sound noise without altering the respiratory sound signal.
From the repetition feature of heart sound, it can be concluded that the width of the sliding window must be greater than two cardiac cycles to ensure that the fetal heart beats at least two times in the window.
One of the major concerns in heart sound analysis is to identify the first (S1) and the second (S2) heart sound [3].
He came back and introduced modern concepts of cardiology like 3rd and 4th heart sounds etc.
Clinical examination revealed ejection systolic murmur in pulmonary area with wide fixed splitting of 2nd heart sound. 2-D Transthoracic echocardiography showed large secundum atrial septal defect with moderate pulmonary hypertension.
Physical examination disclosed that breath sound in the right lung was lower than the left lung, cardiac rhythm and heart sound were normal.
PNP doctors also monitored a "murmur" or abnormal heart sound.