Third heart sound

Medical terminology

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The third heart sound is a Medical terminology , appears in Ventricular diastole Early Rapid filling period At the end, it is believed that the rapid filling blood flow of the ventricle impacts the ventricular wall, making the ventricular wall Chordae tendineae and Papillary muscle Sudden tension and mechanical fluctuation.

Chinese name: Third heart sound
Foreign name: Third heart sound, S3

Characteristics of auscultation: wavelength Long, short duration
Production mechanism: Early diastolic period and end of rapid filling period

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Classification of heart sounds

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heart sounds According to on Cardiac cycle The order of occurrence in can be named as First heart sound （first heart sound, S one ）、 Second heart sound （second heart sound, S two ）, third heart sound, S three ）And Fourth heart sound （fourth heart sound, S four ）。 The third heart sound can be heard in some teenagers.^[1]

Production mechanism

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The third heart sound appears in Ventricular diastole Early Rapid filling period At the end, it is believed that the rapid filling blood flow of the ventricle impacts the ventricular wall, making the ventricular wall Chordae tendineae and Papillary muscle Sudden tension and mechanical fluctuation.^[1]

Characteristics of auscultation

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Wave length, short duration (about 0.04s), limited to Apex of heart Part or above, Supine position And exhale clearly.

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