What are normal Heart rate fluctuations with Pacemaker?
I've been a cyclist for years. 6 weeks ago I had an ablation done and a Biotronik pacemaker implanted. My condition before this was described as 2nd degree AV block, bradycardia, chronotropic incompetence, SVT and atrial flutter. Symptoms were increasingly difficult getting my HR up when exercising making me feel short of breath, problems also when sleeping, feeling fluttering in chest and shortness of breath (sensation is kind of like something suddenly obstructing my breathing, and can disappear as suddenly as it appears).
My previous max HR was ~160, doctor initially set my PM as 60bpm lower and 140bpm upper limits. But the PM was frequently bringing my HR up to 140 with very little activity, so he decreased the sensitivity and also lowered the upper pacing to 120. It seems a little better, but still seems like my HR moves unpredictably and in steps. Say I go for a steady paced walk, it often stays at 85-90bpm for a half hour, then it will suddenly step up to 120bpm and stay there for an extended period, then it might drop down to 100 and stay there for a while, and sometimes it will drop down to 60bpm and stay there for a while. Is this normal HR behavior with a Pacemaker? Usually when my HR is moving around like that I wouldn't even know it except I'm watching my HRM data.
The 2nd concern I have is riding the bike I feel fairly comfortable with my zHR in the 120's, but seems as soon as it hits 130 I get that fluttering sensation and sudden shortness of breath sensation like something obstructing my breathing. Sometimes that feeling just last a second or 2. I've been testing it to see how I feel, so I can talk to the EP doc again shortly, but when I've felt those sensations, I back off. These sensations are similar to what I felt before I had the ablation and PM implant only now seem to be occurring at a much lower HR. So I don't know if this sensation is related to the PM or if there is still something else going on. Anyone familiar with this sort of sensation?
I should also mention there haven't been any events or arrhythmia's reported by the Biotronik monitor.