A Myocardial Bridge is a congenital condition where an artery of the heart, usually the LAD artery, is embedded into the heart muscle being squeezed to different degrees each time the heart beats. Some are long, 4 or 5 inches, and some are short 0.5 inches. But all cause various symptoms. Google: Myths associated with Myocardial Bridge. Surgery to correct is called “Unroofing Surgery “
Also, there is a FB page for Myocardial Bridge. You have to get permission t to join group.