You will hear this sound at the apex in the left lateral position. Use the bell of the stethoscope. Normal in children and young adults. It is abnormal when it persists in a person. Usually abnormal in adults over the age of 40 and can be an early sign of heart disease or congested heart failure.
verb (used without object), subsided, subsiding. 1. to sink to a low or lower level. 2. to become quiet, less active, or less violent; abate: The laughter subsided. 3. to sink or fall to the bottom; settle; precipitate: to cause coffee grounds to subside. Origin of subside.
Subsidence can be induced by the chalk on which such areas are built, dissolving. Such âsolution featuresâ are either caused by excess water building up in one area or by the flow of underground water through zones of chalk which are weaker than others.