I have atypical flutter. Had an 3rd ablation in February 2021 for a while I went into a flutter took metropole, ditilizam180 once a day
, sotalol 60 2 times a day. after ablation went on ditiilazm an sotalol.
I have not had flutter in several months. If I do get flutter doctor say take 30 mg ditlizam ever 6 hours or until I got back in normal sinus rhythm
Don't give up on ablation get one. Your next option is pace maker which does not cure the flutter only it let your heart beat so much.
Good luck
Barry Mandel