My heart rate has been consistently in the range of 90-110 in the last 2 weeks. Ecg, echo and tmt results are normal. What could be the reason? Following full thyroidectomy and papillary carcinoma, I have been taking thyroxine-75 mcg�5 days and 100 mcg�2 days. I have also been on colchicine for the past few months.

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