Both a Holter Monitor and an echocardiogram are appropriate tests for you, which will probably confirm what the ECG showed. You mentioned that you used to training for distance running and that you don't exercise much now. I strongly recommend that you start an exercise program again - you should notice many positive benefits for your health and that some of these problems may lessen or disappear. I hope you find this information useful. I'd also suggest that you speak to your cardiologist after your tests are done to get a final diagnosis and prognosis.
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