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 caused by mining can be predicted in terms of the strength and extent of damage except when a pillar collapses or a tunnel close to the surface falls in. This mostly occurs in very old mines. The manifestation extent to such subsidence is only in the immediate locality of the mines plus a very small area around it.