Third Heart Sound – Physiologic


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 – Physiologic

Maneuver: Supine
Chestpiece Position: Mitral
Chestpiece: bell


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