After Washkansky’s surgery, he was given drugs to suppress his immune system and keep his body from rejecting the heart. These drugs also left him susceptible to sickness, however, and 18 days later he died from double pneumonia. Despite the setback, Washkansky’s new heart had functioned normally until his death.
In the 1970s, the development of better anti-rejection drugs made transplantation more viable. Dr. Barnard continued to perform heart transplant operations, and by the late 1970s many of his patients were living up to five years with their new hearts. Successful heart transplant surgery continues to be performed today, but finding appropriate donors is extremely difficult.
– History.com Staff