Mr. Medaglia and Dr. Tolani rode the subway downtown together… He’d missed the 5:13 train and while he was waiting at Penn Station for the 5:59, a woman came up and said, “You did the CPR on that guy, is he really going to live?”

“I said I think so,” recalled Mr. Medaglia. “She blew me a kiss. She said, ‘God bless you — you did a great thing.’ I just sat on the train home, thinking, ‘Holy Jesus.’ ”

…This was Lieutenant Kelly’s fourth CPR call in 13 years. The three other aideds all died. “Best thing I ever did in my life,” he said…

Having gotten a second chance, Mr. Kiernan, a lifelong bachelor, said he is trying to be a better partner to his longtime girlfriend and is trying to eat more carefully, drink less, and seize each day a little more. “I’m not religious,” he said, “but I keep thinking, ‘Who put that cardiologist on the train?’ Coming home tonight, I looked around the subway car — there wasn’t anybody who looked like a cardiologist.”