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This is Scientific American's 60-second science.

I'm Christopher in Taliatta.

That beeping sound is the normal beating of a heart.

But here's what the same heart sounds like during about a ventricular tachycardia, or VT.

The racing beats are caused by an electrical short circuit in the muscle,

and in a moment, a defibrillator is going to zap the heart to return it to a slow and steady pace.

The root cause of VT?

So the villain inside the heart is almost always a scar from a prior injury.

Philip Kukulich, a cardiac electrophysiologist at Washington University in St. Louis.

Most commonly, that's a prior heart attack, but sometimes it's left over a scar from an infection

that somebody might have, or a inflammatory disease that somebody might have.

That arrhythmia can be treated with drugs or surgery,

too, by inserting catheters up through the leg into the beating heart and blasting the

troublemaking scar tissue with heat. That kills the scar cells and can coax the heart back to a

normal rhythm. But now Kukulich and his colleague Clifford Robinson are trying to achieve the heat

treatment's effect non-invasively by blasting those tiny scarred patches of the heart with high-dose radiation,

...