title: I have heard that it is now possible to replace heart valves without surgery.  How can that be?
mesh_terms: D013504:Cardiovascular Surgical Procedures / Q000295:instrumentation / Q000379:methods; D006349:Heart Valve Diseases / Q000601:surgery*; D006350:Heart Valve Prosthesis; D019918:Heart Valve Prosthesis Implantation / Q000295:instrumentation* / Q000379:methods; D006801:Humans; D019060:Minimally Invasive Surgical Procedures / Q000295:instrumentation* / Q000379:methods