My ekg showed sinus bradycardia, possible left atrial enlargement, rsr' or qr pattern in v1 suggests right ventricular conduction delay. i'm 39 y/o female with orthostatic hypotension & frequent dizziness, but otherwise healthy & a runner.any concern?

I'm good with this: These little variations on the way in which the heartbeat is propagated are common and almost never mean anything. Your bradycardia is healthy if you are a runner. You may want to try a table tilt test to see whether you have more tendency to be orthostatic than other folks; if you stay well-hydrated and haven't had syncopal episodes from it, it may not be a problem.