@ilnapenny Hello... I'm afraid I can't explain what is happening in your particular situation but I have been dealing with Afib and atrial flutter for decades and understand your nervousness and frustration. I think the heart's electrical system is really complicated for mere mortals like us and I have struggled as well to understand exactly what my EPs are telling me and what it all means. The best thing you can do is to do a little research online (I typed 'heart block' in google and very quickly got a basic understanding of what it is). I am sure I have type 1 heart block occasionally but it does not appear to be a problem. It sounds like they plan another ablation for you once they figure out exactly where to go and the test will certainly help them do that. I was on propafenone as well for many years until it stopped working -- they tend to do that. I also have had two ablations and am considering a third one. I could potentially go for cardioversions every time I get a sustained episode since the other two options presented did not appeal to me. It is all very overwhelming and it is important that you take care of your overall health (diet, sleep, some exercise) and try and stay strong. It also helps to have someone to help you deal with all this. The only thing to watch for in researching all this is that it can get overwhelming and confusing in a hurry. A lot of the material online may not be specific to your situation and in language that is not very friendly. I hope this helps in some way. All the best. Mary