Current technologies for Type 1 diabetics in the U.S. blood-glucose meters, continuous-glucose monitors, insulin pumps and new insulins aren't yet at the stage where they can fully replace a functional pancreas.

WSJ: Devices for Type 1 Diabetes Relief

One finding: The type of heart problem that caused cardiac arrest in most of the survivors blood vessels that were too narrow to meet the oxygen demands of the heart during an intense running race can be caught by an exercise stress test.

WSJ: Runners, Rest Easy: Heart Risks Seem Overblown