I am 76, had only one episode of tachycardia at 74 1/2, was medicated with two beta blockers, weaned off one with no problem, have weight-trained and run (now jog) for 35+ years, have large right atrium, take
cozaar with no problems, and accepted the operation for a pacemaker set on at 60 (it was 40 to 50 bpm from years of running) with no problems. I have not had any further problems since the original flutter was easily stopped by cardioversion. Blood pressure is well controlled.