hypothyroidism diagnosed but having palpitations

[saints_2003]

Hi,

I am a 30 yr old male and I have been taking synthroid 125mcg for the past 3 years. For the past month, I have been having diarrhea and palpitations mostly while lying down. So, I stopped taking synthroid for a few weeks. Recent bloodwork showed my tsh to be 29 and all of t3, t4, to be on the lower limit of the normal range. Still, occasionally I have palpitations and fast heart rate going upto 110bpm. I have been taking a small dose of propanolol for redcing heart heart. I have also since started taking 50mcg synthroid prescribed by my endocrinologist. My endo still doesnt believe the palps are due to the thyroid and referred me to a cardiologist. I also have an elevated cpk level - around 500 which i saw online could be due to hypothyroid sometimes.

Any suggestions would be helpful. anyone else have similar symptoms?

thanks so much...  

[saints_2003]

Thanks so much for replying. All levels were always tested as normal for the last 3 years when the synthroid dosage stabilized. These problems started about a month after i shifted from the cold northeast to warmer south. I lost a lot of weight too in this time. I was tested for thyroperoxidase antibody about 3 years back when I was first diagnosed with hypo and it was somewhere over 750. My thyroid results from last week are:
TSH: 28.85  Ref: 0.4-4.5
T4, free: 0.8 Ref: 0.8-1.8
T3, free: 2.1 Ref: 2.3-4.2
T4,total: 5.1 Ref: 4.5-12.0
T3,total: 76  Ref: 76-181

My CBC and metabolic panel were normal. My creatinine kinase level has been consistently highly over the last month, the most recent being 495. I still have palpitations mostly while lying down for which my PCP gave me propanolol 20mg thrice daily. Yesterday, I did an EKG and it turned out to be abnormal with ST-elevation and the diagnosis was pericarditis. I was sent to get an echocardiogra. I still havent heard from the doctor but the technician performing the test was nice and was explaining me that everything looks fine to him. My ck-mb levels were high a few weeks ago but the ck-mb index was normal. troponin levels at the time were also normal. I have no personal or family history of heart disease. My PCP still thinks that my palpitations, ck level, abnormal EKG everything is related to me being hypo right now. He increase my dosage to 75 mcg daily for now. Any insights?
Thanks.

[laura1967]

Hypothyroidism can cause an array of symptoms that can be very similar to hyper symptoms. Palpitations is one of those symptoms. You are definately very hypo and if I had to guess, you were probably still having those palps because you were still in the hypo range. Do you have any of your lab results from when you were still on the 125mcg? I would like to see your Free T4 and Free T3 levels for that timeframe.  Your TSH and Free T4 can appear to be "normal" , but if your Free T3 isn't at least mid normal range, then you can absolutely remain hypo with symptoms, which would be considered a conversion issue. Normal range doesn't necessarily mean normal, especially for a Hashimoto patient. Did you have any tests for this to see if you have Autoimmune thyroid disease? This also could explain such a wide range of symptoms as well.