Ventricular fibrillation appears to be a newly identified diagnosis among Sen. John Fetterman’s ongoing medical issues, disclosed after a fall on Thursday sent the Pennsylvania Democrat to the hospital.

The condition is the most severe form of arrhythmia and a common cause of sudden cardiac death. His outcome could have been helped by the defibrillator that Fetterman had implanted after a stroke during his 2022 election campaign, according to doctors specializing in heart conditions who were not involved in his care.

Fetterman’s spokesperson said in a statement he was doing well and undergoing routine observation at the hospital.

Fetterman has previously disclosed that he has cardiomyopathy, a major risk factor for ventricular fibrillation. As treatment following his stroke, he had a pa

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