Mitral valve prolapse (MVP) occurs when the leaflets of the mitral valve bulge (prolapse) into the heart’s left upper chamber (left atrium) like a parachute during the heart’s contraction. Mitral valve prolapse sometimes leads to blood leaking backward into the left atrium, a condition called mitral valve regurgitation.
Symptoms include a racing or irregular heartbeat, dizziness or lightheadedness, difficulty breathing or shortness of breath, fatigue, chest pain not caused by a heart attack or coronary artery disease.
Mitral Valve Prolapse. Mayo Clinic. https://www.mayoclinic.org/diseases-conditions/mitral-valve-prolapse/symptoms-causes/syc-20355446