title: Ask the doctor.  I am 77 years old, and my doctor recommended surgery to replace my aortic valve.  He said my choice is between a mechanical valve and a pig valve.  Which is the preferred option?
authors.forename: Richard
authors.initials: R
authors.lastname: Lee
mesh_terms: D000368:Aged; D001024:Aortic Valve Stenosis / Q000601:surgery; D003657:Decision Making; D006350:Heart Valve Prosthesis; D006801:Humans