Is lifting weights put someone at high risk with atrial fibrillation?

Not: No connection. But muscle building steroid may.

PAF: There is mounting data showing that athletes who generate a lot of upper body strain (ie rowers, weight lifters) have an increased incidence of a fib, felt to be due to back pressure on the heart during straining that ultimately stretches out the top chambers which is where atrial fibrillation comes from. As you continue weight lifting, be aware that your paroxysmal afib may become persistent.