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Intermittent heart flutter - hypothyroid, on thyroxine
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Intermittent heart flutter - hypothyroid, on thyroxine

I am a 50y old female, stable on 0.075mg thyroxine for hypothyroidism (?etiology Hashimoto's) for several years.  I am currently training hard for triathlons and have no symptoms while swimming, running or biking hard, but at rest have 1, 2, or 3 or more groups of what I call "flutters" in my L chest every soo often and unrelated to anything in particular.  I am a doctor, and have a family history of atherosclerotic heart disease, but have had normal ECG's, lipids and stress tests in the past 2 years.  My pulse is normal during these episodes.  I had an Holter monitor for 18 hours about 3 weeks ago - had no symptoms while it was on (even though I did a bike training session indoors!) and have heard nothing about the results.  I assume they were negative, but will confirm this.  Could these be atrial in origin? Could they be due to the thyroxine I am taking?  ie could I be a bit thyrotoxic and is this a symptom one would expect from thyroxine ingestion?  I have recently changed from taking the thyroxine last thing at night to first thing in the morning, but the symptoms were occurring prior to this.  I had intolerable flatus which seemed related to the time of day I took the thyroxine - have you ever heard of this?
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