https://apnews.com/article/ventricular-tachycardia-heart-radiation-ablation-3b7db2a921bd416c62a7472eca905b69 > ST. LOUIS (AP) — 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. > While it's highly experimental, surprising early research suggests it may reprogram misfiring heart cells to control heartbeats more like younger, healthier cells do.