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First Heart Sound (Minimally Split)

First Heart Sound (Minimally Split)

On occasion the first heart sound can be made up of two separate sounds separated by a very small interval (20-30 milliseconds). The Mitral component (caused by closure of the Mitral valve) comes first and is louder than the Tricuspid component (caused by closure of the Tricuspid valve). A minimally split first heart sound is a normal variation of the first heart sound.


Auscultation Sounds

auscultation sound from lesson
waveform


Patient Recording

patient heart or lung sound
First Heart Sound (Minimally Split)


Patient Recording - Half Speed Playback

patient heart or lung sound
First Heart Sound (Minimally Split)



Position

Patient position
The patient's position should be supine.

Listening Tips

S1:Minimal splitting


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.



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