mitral valve prolapse
nounMedical Definition of mitral valve prolapse
: a valvular heart disorder in which one or both mitral valve flaps close incompletely during systole usually producing either a click or murmur and sometimes mitral regurgitation and which is often a benign symptomless condition but may be marked by varied symptoms (as chest pain, fatigue, dizziness, dyspnea, or palpitations) leading in some cases to endocarditis or ventricular tachycardia
—abbreviation MVP
— called also Barlow's syndrome