Eight years after the heart-bypass operation that saved his life, Floyd Stokes was in deep trouble again. His angina had returned with a vengeance. He was gulping nitroglycerine tablets and was virtually incapacitated, unable to do simple chores on his Seminole, Texas, ranch. Too far gone for another bypass, he had a choice, as he puts it, of "just waiting for death or trying to do something about it."
Stokes chose to survive. He volunteered to take part in a novel clinical trial about to be conducted on heart patients by Dr. Jeffrey Isner at the St. Elizabeth Medical Center in...