The terrific jolt of a defibrillator may one day be replaced by beams of light to bring hearts back to life. A Johns Hopkins University-led research team hopes to avoid the tissue damage and other side effects of a defibrillator or pacemaker's electrical shock. "When we use a defibrillator, it's like blasting open a door because we don't have the key. ... We think it's possible to use light to reshape the behavior of the heart without blasting it," said Natalia Trayanova, the Murray B. Sachs Professor of Biomedical Engineering at the university.

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