First Heart Sound (Minimally Split) Reference Guide.
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 Sound From Lesson
Patient Recording - Half Speed Playback
The patient's position should be supine.
Listening TipsS1: Minimal splitting
First Heart Sound (Minimally Split) - Reference Page