In the United states, an estimated 300,000 people die every year of sudden cardiac arrest although internationally, it's unclear how many are at risk.
Many patients have a device called a defibrillator implanted that delivers a shock to restart the heart. Now, some doctors are prescribing the device in a vest worn outside the body.
And the National Heart, Lung and Blood Institute is testing the effectiveness of "The LifeVest."
Thousands wear the device and the Pittsburgh-based manufacturer says it expects the number of patients using the technology to double this year. Steve Mort reports.
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