Tv and movies show them as a magical heart restart machine, bringing people back from the dead. But I’ve heard medical professionals say that’s not true, but they never elaborate. I’ve seen portable ones everywhere, so they must be needed fairly regularly.
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the heart normally beats in what’s called a sinus rhythm. this is the usual thump-thump you’ll hear if you listen to a normal heart. sometimes the heart freaks out and beats in an erratic rhythm… the defibrillator literally shocks the heart in the hopes that it will start to beat normally again. if the heart is not beating, shocking does nothing.
if you recall (or have seen in movies) old TVs, usually, they work fine, but sometimes the picture goes wavy, or staticy, or starts doing weird things, and someone goes up and give the tv a solid WHACK on the side and now the picture is back to normal… that’s basically what’s going on. whacking a TV that isn’t turned on won’t magically make the picture appear…it has to be at least on.
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