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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

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

Authors and Sources

Authors and Reviewers


Sources

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Third Heart Sound - Physiologic | #35


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