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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After reviewing the sound, use the waveform and anatomy tabs for more information about this sound.