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Third Heart Sound - Physiologic

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 Sounds

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

//embedding heart animation

Authors

These authors contributed the audio recordings and text found in this reference guide: Jon Keroes, MD,Diane Wrigley, PA, and David Lieberman.
Medically reviewed by Dr. Barbara Erickson, PhD, RN, CCRN.

Sources


Sources




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