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About Mitral Valve Prolapse & Regurgitation. A heart murmur that is most pronounced when the stethoscope is positioned at the heart's apex and occurs in the late systolic phase may be caused by mitral valve prolapse. This is also known as floppy valve syndrome. The murmur is normally preceded by a series of clicks.
The valve also connects the tubes to the chestpiece, which can be either a bell-shaped piece to pick up low sounds or a flat disk for higher frequencies. The stethoscope is used mainly for the detection of heart murmurs, irregular heart rhythms, or abnormal heart sounds. It is also used to listen to the sound of air moving through the lungs in order to detect abnormalities in the air tubes and sacs found in the lung walls.