I have dual chamber PM for bradycardia as result of my EP wanting to put me on Sotalol. That part works fine.. no exercise restriction( treadmill). But as for PM intervening an aFib episode, so far it hasn’t. It’s a low % success rate & I am one.Disappointed but Sotalol seems to help self convert me.. so that’s good. Sotalol is safer than Flecainide for structural heart disease ( valve issues). Hope this helps answer your concerns.