Senator John Fetterman was hospitalized Nov. 13 after a heart issue called ventricular fibrillation caused him to fall near his home in Braddock, PA. Joshua Cooper, MD, FACC, FHRS, Director of Cardiac Electrophysiology at Temple University Hospital, explained to 6abc, CBS News Philadelphia, NBC10 and The Philadelphia Inquirer that the condition is the most severe form of arrhythmia and shared how it’s treated.