So did 75-year-old Floyd Sheckells Jr. And he had no way of knowing his guardian angel who was standing in line when he started to feel the first pains of a heart attack.

The move follows the death of a 10-year-old boy who went into cardiac arrest at LaSalle Elementary School last week.

THE FACTS

The University of Miami installed 54 life-saving devices around campus in January as a result of an Aug. 17 Coral Gables city ordinance. Automatic External Defibrillators must be present in all places of public assembly in excess of 20,000 square feet, the ordinance says.

For decades, Seattle has led the nation in 911 medical response with a strategy of basic life-support services by firefighters trained as emergency medical technicians, advanced care by paramedics when needed, and citizen participation in lifesaving. The…