A heart transplant involves surgically removing a heart from a deceased donor and implanting it into a recipient whose heart has failed. Heart disease is a major health problem in the United States, affecting millions and being a leading cause of death. Candidates for heart transplants include those with severe heart failure that does not improve with treatment. After evaluation, recipients undergo the transplant and face risks of complications like rejection by the immune system, infections, high blood pressure, and other issues requiring lifelong medication and monitoring.