A heart-stopping condition that causes about half of all cardiovascular-related deaths seems to happen in an instant, with no symptoms.
But several recent studies show that, sometimes, people who experience sudden cardiac arrest have warning signs hours – and even weeks – ahead of time. Experts say that’s why it’s important for everyone to be educated about the signs and to know what to do when someone’s in trouble. It’s also why, for those who seemingly have no symptoms, more research is needed.
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– Sudden Cardiac Arrest Foundation