Heart sound graph

The method of recording the vibration generated during the cardiac activity from a chest wall into a line pattern through a special electronic device, which is a heart sound graph machine, is called a heart sound graph examination. Heart sound graph. (1) Verify that the heart hearing clinic sees it, and supplement the lack of auscultation. (2) Determine the time when heart sounds or murmurs occur, so as to distinguish between heart sounds and murmurs that are easily confused clinically. (3) Describe the shape of noise, such as rhombus, decreasing shape, etc. (4) Assist in the diagnosis of certain cardiovascular diseases, identify some heart diseases with similar surface murmurs but different lesions, such as coronary heart disease (the change of the fourth heart sound-S4 before and after exercise), estimation of mitral stenosis, pulmonary valve The difference between stenosis (valvular or funnel), open arterial duct and main pulmonary artery defect. (5) As a component of non-invasive cardiac examination, the combination of heart sounds and echocardiography, carotid pulsation, and apical pulsation can estimate the hemodynamic changes and cardiac function of certain cardiovascular diseases. It can also study the mechanism of heart sounds and murmurs, and infer certain pathophysiological changes. (6) The heart sound map turns the heart sound and murmur into a long-term analysis graph, which can be used as an objective indicator for judging the change of the lesion and comparing the curative effect of surgery or medicine. However, the heart sound map cannot replace auscultation, it cannot distinguish the sound source from the heart and the heart, and it cannot distinguish the sound of heart sounds and murmurs (such as rumbling or hair blowing). Heart sounds and murmurs described by heart sounds are sometimes inaudible to the human ear, but sometimes the heart sounds can not be heard (such as some diastolic murmurs of the aortic valve). The human ear is more sensitive to high frequencies, if necessary With the help of a stethoscope.