Matt Gittinger, a UW Medicine physician off-duty from his job at Harborview Medical Center, responded to an alert on his smartphone and helped save a man's life.

Douglas Stine was driving with co-workers when a heart condition caused him to gasp for air and lose. The other workers called 9-1-1, but help arrived before the paramedics.

Gittinger is one of 3,300 people in Seattle who have downloaded Pulse Point, an app that alerts people trained in CPR and directs them to the location where help is needed.

“I was out of my front door within five to 30 seconds and it was about two blocks from where I live,” Gittinger said.