The big worry in sudden cardiac arrest beyond restarting the heart is protecting the brain.
And of the 220, 000 incidences of sudden cardiac arrest per year in the U.S., about 10, 000 occur at work.
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Statistics show more than 200, 000 Americans die of sudden cardiac arrest every year, according to the American Heart Association.
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Vollmer had the symptoms of long Q-T Syndrome, a condition that often leads to heart arrhythmia and sudden cardiac arrest.
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An estimated 250, 000 people die from sudden cardiac arrest each year in the United States, when the heart unexpectedly stops beating.
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Mickey Eisenberg, medical director of the county's emergency medical services, says the devices make a "modest" but important contribution to the county's success against sudden cardiac arrest.
Among other benefits, researchers expect the information will be valuable to the city's 911 dispatchers, who could provide AED locations to callers reporting episodes of sudden cardiac arrest.
Sudden cardiac arrest occurs when the heart unexpectedly stops beating.
Bob Schriever, co-founder of the Sudden Cardiac Arrest Association, was refereeing a high school football game seven years ago when he went into cardiac arrest, died and was revived.
Emergency-services experts say that in general odds of survival are reduced by 10% for every minute a person is collapsed from a sudden cardiac arrest without cardiopulmonary resuscitation or defibrillation.
While reliable data are scant, of the estimated 225, 000 reports each year of people collapsing of sudden cardiac arrest, some experts estimate AEDs are generally used to help fewer than 5% of victims.
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