answer:Even if I was a doctor, I would not diagnose over the internet. I am going to give you the standard “go to the doctor” answer and tell you that the same thing happened to me. I am certain you were expecting the “go to a doctor” thing. 192 is an abnormally fast pulse, as I am certain you know, even when exercising. Blood pressure does not necessarily play a role. I have the same problem, as I am about to tell you, and I run low BP, have always run low BP. My BP did not change with the onset of tachycardia. I have the same problem. I am a martial artist, have been in shape all of my life, etc. et al. Back in the early 80’s, my pulse jumped from its normal 60 bpm resting to running tachycardic at rest, taching at well over 170 when exercising. Tachycardia is rapid heart rate. I saw a doctor, they ran tests, nothing was found. Over the years I have had tests for it and nothing is found. Having not identified the etiology of the problem, I am medicated with low dose of a beta blocker which solves the problem. So, it could be nothing serious like me or it could be serious. It is nothing to play with.