<unk>  <unk>  is a valvular heart disease characterized by the displacement of an abnormally thickened<unk>  valve leaflet into the left atrium during systole. It is the primary form of myxomatous degeneration of the valve. There are various types of<unk> , broadly classified as classic and nonclassic. In severe cases of classic<unk> , complications include<unk>  regurgitation, infective endocarditis, congestive heart failure, and, in rare circumstances, cardiac arrest. The diagnosis of<unk>  depends upon echocardiography, which uses ultrasound to visualize the<unk>  valve.<unk>  is the most common valvular abnormality and is estimated to affect 2–3% of the population and 1 in 40 people might have it. The condition was first described by John Brereton Barlow in 1966. It was subsequently termed<unk>  by J. Michael Criley. Although mid-systolic click (sound of<unk> ng<unk>  leaflet) and systolic murmur have been noticed earlier with stethoscope in 1887 by physicians M. Cuffer and M. Barbillon.
Mitral valve prolapse
Da Costa's syndrome  Da Costa's syndrome  1
Mitral regurgitation
Aortic regurgitation
Mitral stenosis
Tricuspid regurgitation
Tricuspid valve stenosis
Pulmonary valve stenosis