What is mitral valve prolapse?
Four heart valves control how blood flows in and out of your heart. The valves are like one-way doors that keep blood flowing in the right direction.
Your mitral valve separates your left atrium and left ventricle. This valve opens to let blood from your lungs out of your left atrium and into the left ventricle. The valve closes to keep blood from running back into your left atrium.
In mitral valve prolapse, the mitral valve bulges back into the left atrium when your left ventricle contracts. If that bulge also causes blood to leak backward into the left atrium, that's called mitral regurgitation Mitral Regurgitation Four heart valves control how blood flows in and out of your heart. The valves are like one-way doors that keep blood flowing in the right direction. Your mitral valve separates your left atrium... read more .
(See also Overview of Heart Valve Disorders Overview of Heart Valve Disorders Your heart is a muscle that pumps blood through your body. Your heart has four chambers. The atria are the two upper chambers in your heart—the right atrium and the left atrium. The ventricles... read more .)
What causes mitral valve prolapse?
What are the symptoms of mitral valve prolapse?
How can doctors tell if I have mitral valve prolapse?
Doctors suspect mitral valve prolapse when they hear a clicking sound while listening to your heart with a stethoscope. Doctors use echocardiography Echocardiography and Other Ultrasound Procedures Echocardiography can be used to detect abnormalities in heart wall motion and to measure the volume of blood being pumped from the heart with each beat. This procedure can also detect abnormalities... read more 
(an ultrasound of your heart) to confirm the diagnosis and see if the valve is leaking.
