Similar to Monty I had some symptoms but passed all the tests .... exercise EKG, nuclear perfusion, sonar, etc. and used a Zio Patch monitor for a couple of weeks with out any data detailing a cause for occasional light headed feeling when at rest with low heart rate. (heart worked fine at higher heart rates)
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My I as what symptoms you had?

Was it just light headed at rest?

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Train safe & smart
Bob