I’m currently on a heart monitor now (I’m 22, and 130lbs) so that they can monitor the conduction disturbances I get from AS. I have random episodes where my resting heart rate jumps into the 140s-150s and stays that way for minutes to days. They ruled out every other possible cause including congenital. Have you had a monitor or ultrasound done? It let my rheumatologist and cardiologist pinpoint the extent of the inflammation impacting my heart as well as the role of not having my pain managed. Im suppose to start Humira next week so I’m scared to see if it’s going to make it worse. I’ll let you know if it does!