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Third Heart Sound - Physiologic Reference Guide

Third Heart Sound - Physiologic

The third heart sound is heard early in diastole. Along with the first and second heart sounds, this extra sound creates a gallop cadence and sounds like "Kentucky." In this auscultation example the second heart sound is unsplit to make it easier for you to distinguish the third heart sound. The third heart sound is very low frequency (between 25Hz and 50Hz). Listen with the bell of the stethoscope at the cardiac apex. Asking the patient to lie on his left side will frequently increase the intensity of the third heart sound. A third heart sound is heard on occasion in normal individuals with no cardiac pathology.


Auscultation Sound From Lesson

auscultation sound from lesson
waveform


Patient Recording

patient heart or lung sound
Third Heart Sound - Physiologic


Patient Recording - Half Speed Playback

patient heart or lung sound
Third Heart Sound - Physiologic


Position

Patient position
The patient's position should be supine.

Listening Tips

S2:Unsplit
Diastole:S3 in early diastole. Low-pitch. Galloping (S1,S2,S3) or intermittent sound


Waveform (Phonocardiogram)





Observe Cardiac Animation


Third Heart Sound - Physiologic | Description, Audio and Animations | #35

Authors and Reviewers

Authored by Dr. Jonathan Keroes, MD and Diane Wrigley, PA.
Medically reviewed by Dr. Barbara Erickson, PhD, RN, CCRN.
Last Update: 12/06/2021

Sources


Sources



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