Thank you to everyone who replied to my post about periods of excessively high heart rate following a PVI ablation a couple of weeks ago. I have contacted the hospital and they have been lovely. Good old NHS!! I've been put back on the Bisoprolol and will have a 48 hr tape next week so they can see what's going on. Hopefully all will be ok and it will be a question of patience but it is good to hear that others have experienced similar effects and the responses did prompt me to contact the hospital which was a good move. Thank you.