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Immediate auscultation[edit] Immediate auscultation is an antiquated medical term for listening (auscultation) to the internal sounds of the body, directly placing the ear on the body. It is opposed to mediate auscultation, using an instrument (mediate) i.e. a stethoscope.
FIRST HEART SOUND. Auscultation begins with listening for the first heart sound (S1) at the lower left border of the sternum. The S1 is caused by closure of the mitral and tricuspid valves and is normally a single sound. An inaudible S1 indicates that some sound is obscuring the closure sound of these valves.