Robert Underwood, a parent of a 16-year old girl who died of Sudden Arrhythmia Death Syndrome, is campaigning to get defibrillators in all schools.
Contrary to popular perception, a defibrillator actually stops the heart, rather than restarts it, allowing it to naturally regain normal rhythm.
With a defibrillator to hand, a patient has a considerably greater chance of survival.
It's estimated that more than 95 percent of cardiac arrest victims die before reaching the hospital.
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