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First Heart Sound (Minimally Split)

Heart Sounds Lesson

maneuver image
Supine
torso and chestpiece
Diaphragm

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.

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