I have been running for a decade including 6-7 marathons. Two years ago, while training, I had brief bouts of tachycardia. Cardiologist did tests that showed my heart was "structurally" sound. Then put me on Bisoprolol. That had side effects so I tried Diltiazem to mitigate SVT episodes. Both did appear to help but I stopped due to side effects. End result was Dr said SVT is rarely fatal and unless my quality of life was affected there was nothing more to do. Not wanting to aggravate the condition I have stopped running (but do a lot of walking). Are there any runners out there with similar experiences?
Liked by Dee