sudden heart rate drop while running
Hello, all. I got my Boston Scientific ACCOLADE MRI Pacemaker (dual chamber) on July 29, 2019. About three weeks ago I resumed running after getting cleared by my doctor. I'm rather deconditioned from not run for about 12 weeks. I have been going out every other day for very easy, 20-25 minute runs. My pace is very relaxed, about 13-minute miles, in which I have complete control of my breathing. I could easily carry on a conversation at this effort. My heart rate at this pace is usually between 130 and 145 BPM.
On almost every run, I've had an episode which lasts for 30-60 seconds where my heart rate suddenly plummets from 130-145 BPM to about 80 BPM. Almost instantly, I lose my breath, my legs lose all their strength and I feel light-headed. Then, 30-60 seconds later, I feel fine. My heart rate goes right back up to nearly where it was, I catch my breath, and I can continue on.
I reported this to my EP and they adjusted my device ceiling to 160 BPM. It had been set at 130 BPM.
However, on my last run after the adjustment, I had the same experience. Has anyone else experienced something like this while exercising?