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In this photo provided by Washington University, Jeff Backus is fitted with a vest of electrodes in St. Louis on Tuesday, Feb. 7, 2023, to map how his heartbeat goes awry. Doctors are zapping the heart with radiation normally reserved for cancer, a bid to better treat people with life-threatening irregular heartbeats who've exhausted other options. (Huy Mach/Washington University, St. Louis via AP)

In this photo provided by Washington University, Jeff Backus is fitted with a vest of electrodes in St. Louis on Tuesday, Feb. 7, 2023, to map how his heartbeat goes awry. Doctors are zapping the heart with radiation normally reserved for cancer, a bid to better treat people with life-threatening irregular heartbeats who've exhausted other options. (Huy Mach/Washington University, St. Louis via AP)

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