Thank you for your detailed reply. The episode I described on the Peloton was a one-off. There have been many times (after heavy exercising, where my heart rate was high) I experienced a short (several minutes) feeling of confusion, where I try to remember something, and I'm unable. This feeling only last for a few minutes. I wore a holter monitor recently (intended for a week) but reacted to the gel that was used to adhere it to my skin, so I had to remove it after 3 days. The cardiologist said there was enough information, and there were "no concerning findings." When I showed her a ECG from my Apple Watch, she said, "those are AVCs". I'm on 25mg of Metoprolol in the a.m. I wish I could attach a recent reading from my watch, which according to "Dr. Google" looks like ventricular tachycardia. I don't know if the two are related, but I definitely correlate these "feelings" with my heart rate - 100%. It sounds like from you reply that you're either an MD or have done more research than them. In your laymen's opinion, do you think it would be worthwhile seeing an Electrophysiologist? My neurologist wants me to have an MRI with contrast. (He's looking for epileptiform activity.)