Pacemaker - Tachycardia Question
A brief history of myself. I am a 24 year old male who was recently diagnosed with Celiac and I take Florinef for low BP. I had a pacemaker installed 2 years ago for two reasons. Firstly, my resting heart rate was around 30-40 and sleeping heart rate was around 20...but mostly because I had malignant neurocardiogenic syncope (severe fainting) which stopped my heart on numerous occasions causing head injuries. Finally it stopped my heart twice in the hospital and they put a pacemaker in.
Currently I had another black out after 2 years of success. The pacemaker clinic said my heart was going up and down too quickly for the algorithm set on the pacemaker and decided to basically set the threshhold so high that I pace at 90 almost all day.
My heart tends to be able to jump up to 100 and back down to 40 in a very quick time. They were unsure as to why this was, but they said the aggressive setting should keep me from blacking out. Now the cardiologist said I have quite a few rates of a 180+ tachycardia events recorded, with the highest being 210. He said they appear to be sinus tachycardia and I'm youing, so he is not too concerned but wants a loop monitor to check if it something more serious.
My question is, if the reason I got the pacemaker was for severe bradycardia and heart pauses, isn't it odd that I'm having HR's that high even sometimes? When I did a stress test 2 years ago, they had to stop the test because I could not reach a HR over 175. Now if I try to exercise, I am that high within 10 minutes. I feel like if i even go up the stairs, my chest is pounding and I feel weak. I have not worked out much lately due to this. Does this sound normal and am I just being paranoid? Also the person who evaluated my pacemaker said I tend to jump up and down, yet the cardiologist just shrugged me off. Is this typical as well?
I ask these questions because I have to wait 3 weeks for a loop monitor appointment.