BHF Prof Caputo holding Finley on day he left hospital. See SWNS story SWLNstem. A heart surgeon has carried out a 'world-first' operation using stem cells from placentas to cure a baby's heart defect. Professor Massimo Caputo from the Bristol Heart Institute used pioneering stem cell injections to correct a two-month-old's heart disease, which 'probably saved the life' of the boy. The recipient of the life-saving procedure, Finley, is now two years old and 'a happy growing little boy'. He was born with the main arteries in his heart the wrong way round and at just four years old had his first open-heart surgery at Bristol Royal Hospital for Children.