Dear Doctors: I’ve been getting dizzy when I exercise or even stand up too fast. I got sent to a cardiologist who says it’s mitral valve stenosis. He thinks I’m a good candidate for a catheter repair that uses a balloon. A friend who had that says it’s not a big deal. Is that really true? I’m worried.
Dear Reader: The mitral valve separates the two left chambers of the heart. The mitral valve is ma…