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.
First Heart Sound (Minimally Split)
The recommended auscultation position for the stethoscope is the Tricuspid position. For this sound, use stethoscope's Diaphragm.


maneuver
The recommended patient position is Supine

Phonocardiogram

waveform
This waveform plots sound amplitude on the vertical axis against time on the horizontal axis.

Heart Animation

Lessons
left button        right button



Listening Tips
A synopsis of important sound features and timing for this abnormality.
S1: Minimal splitting.
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