Third Heart Sound


The third heart sound (S3) is a low-frequency, brief vibration occurring in early diastole at the end of the rapid diastolic filling period of the right or left ventricle. Synonymous terms include: ventricular gallop, early diastolic gallop, ventricular filling sound, and protodiastolic gallop.
This sound is dull, much more so than the normal sound. It is a shock, a perceptible elevation; it is hardly a sound. If one applies the ear to the chest it is affected by a tactile sensation, perhaps more so than an auditory one. … In addition to the two normal sounds, this bruit completes the triple rhythm of the heart. It thus produces a rhythm of three sounds unequally distinct, and occasionally unequally distant, a rhythm which the ear seizes with extreme facility, provided that it had once perceived it distinctly. This is the bruit de gallop.
Third Heart Sound Present
Third Heart Sound Not Present

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