In late 2009, when I was in my early 20s, I suffered from generalized anxiety disorder and would get frequent PACs and PVCs. It bothered me a lot, so I got checked out by two different cardiologists and both of them came to the same conclusion. They decided my heart was healthy and that I had nothing to worry about. They suggested I start exercising regularly and move on with my life, which is what I did. That year, had about 10 EKGs, one 24 hour Halter monitor and an one echocardiogram around this time. Maybe this wasn't enough testing?
Between 2010 and 2013, I did a lot of super-endurance exercise, mainly cycling. I averaged about 20 miles per day cycling and 2.5 miles per day walking. Since 2015, I also picked up a lot of lifting. I would get my typical premature beats and skipped beats every so often during this decade, but I ignored them like my cardiologist suggested in 2009. Recently, my symptoms have gotten more worrisome. In early 2017, I started to get what felt like couplets and triplets. I would feel two or sometimes three really quick beats in a row. Last night, for example, I was lying in bed when suddenly I felt a really quick POP POP in my chest. I estimated the rate to be 240 BPM. One time I was just sitting at my desk when suddenly I felt this tickling sensation in my chest and could feel a POP POP POP at a rate of about 140 BPM. I am basically experiencing couplets and NSVT on a regular basis now. This has NEVER happened before. There hasn't been a single day that I haven't experienced couplets since about May of this year.
Could I have damaged my heart through too much exercise? Could have made a pre-existing disease worse? I don't smoke or drink, I have a very healthy weight and I'm *relatively* young at 32. How much could my heart have changed in the span of my 20s?