In medical terminology, the normal "lub dub" sounds of a heartbeat are labeled S1 and S2. Abnormal sounds that may be heard include S3, S4, rub, murmur, and snap.
ventricular fibrillation (v-fib)
The venous pressure increases during the second heart sound because of the increased negative pressure. 2nd heart sound heard when AV valves close,ventricular diastole
The sound is caused by the closing of valves in the heart.
S1 makes a "lub" sound. It is the first heart sound in a normal rhythm. The sound is produced when the AV valves close.
Does a heart make decibels? Never heard a heart.
Crepitus.Abnormal crackling sounds are called rales when heard on ausculation of the lungs, but called crepitus when heart in a joint, gangrenous skin, etc.
heart murmur
Stridor
wheezing
S1 which is the closing of the atrioventricular valves.
Murmur
The mitral, or bicuspid valve