Pacemaker stops pacing as I increase intensity of work out

Hi! I started training for marathon last year, it was a gradual slow training process as my trainer knew I have pacemaker. I was also going to the pacemaker clinic several times and they made several tweaks on my pacemaker setting. However, late last year I wasn't able to join the marathon I signed up for because as we started our training for uphill, I noticed I have some fainting episodes. I went back to clinic and they've done a holter monitoring and it showed several SVTs but they said it's not sustained and it's alright. But early this year, I went for hiking which I used to do before but this time it's quite different because I felt really almost blacking out. I went to see my cardiologist and had a stress test done, it showed from there that my pacemaker is pacing well at normal speed but when we reached 3 mins of faster steps/jogging on the treadmill, my pacemaker stopped pacing and my heart is not going up when it should, it stayed less than 100 bpm. The cardiologist who saw me said he needs to asks others first on what to do, so after paying 700 dollars for a consultation, I actually doesn't have a clue on what's going on because the cardiologist/EP doesn't know the answer as well. Hoping someone here experience my symptoms as well and can shed a little light. ANd if this means I should restrain myself from doing further physical activity such as hiking or running? Thank you


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