Arrhythmia

What would cause arrhythmia(pac or pvc) laying in bed at night and trying to sleep and also what causes either pac or pvc when adult male person wakes up during sleep,but not during exercise and (less) during daytime,when the same person had a normal stress echo and does not have high blood pressure?The temperature at night is between 96.5 to 97.5.Thyroid function tests results are: tsh 0.87, t4 9.7 t3u 33.7.Would the above thyroid function tests results cause arrhythmia?If no at what level would thyroid tests cause arrhythmia? At what level do thyroid function tests (tsh,t3,t4) cause heart disease and are tests accurate?Thank you

[CCF-M.D.-RCJ]

zk,

Thanks for the post.

Q1:"What would cause arrhythmia(pac or pvc) laying in bed at night and trying to sleep ...?"

Some people have vagally-mediated PAC/PVC.  During periods of rest, and especially at night, most people have a high vagal tone (also called high parasympathetic activity).  For whatever reason, a high vagal tone can lead to arrhythmias in some people.

Q2:"Would the above thyroid function tests results cause arrhythmia?"

I don't think so, but you didn't provide the lab references.

Q3:"At what level do thyroid function tests (tsh,t3,t4) cause heart disease and are tests accurate?"?

Abnormal thyroid function does not cause cardiac manifestations in all people, nor do all people respond the same.  If a person is experiencing tachycardia or atrial fibrillation, and they have abnormal thyroid tests, then fixing the thyroid is a reasonable thing to do.  But it is not A+B=C, by that I mean that you cannot say that abnormal thyroid function reliably leads to abnormal hearft function or heart disease.

Hope that helps.

[DottyCece]

I have been kept hyperthyroid for years in order to prevent further thyroid malignancy.  Years ago, I had five occurances of thyroid cancer in about five years so this was one of the ways they were suppressing it.  So, recently when I did have atrial fibrillation, they reduced my thyroid medication by 1/2 so that now I am euthyroid or normal.  However, it has not prevented re-occurrences of atrial flutter.  This has occurred four times which has required cardioversions while my thyroid has been normal.  So, I don't think there is a correlation in all individuals as the MD said. Having been hyperthyroid for so many years, this has been a huge adjustment.  I am tired all the time, go to bed very early.  I have been trying to get them to increase my thyroid a bit..but we will see.  

I have noticed very rapid and irregular heart rhythms when I lay down at night, expecially on my left side.  It usually goes away after about 20 minutes or so or I fall asleep and don't know what happened.

[Joe P.]

Hi, I could not post but Ill Ask Here... I seem to have some what the same thing.... I'm 27, this started when I was 26... I used to smoke and drink heavily and not to active life style, I started getting chest pains, and once in great while at night, some time I would get woke up and my heart felt like it was fluttering. They didn

[Joe P.]

Hi hankstar, Thanks for the reply, Yes, thats what he said I had.. ( neurocardiogenic syncope ). And he did put me on betablockers. I have been off of them for a few months, however. as I Don't seem to get light headed any more. But one thing I did notice is before I started getting light headed, Is that I hurt my neck, I Went to the University Of Chicago, I Had a enclosed mri, ct and mra, and they said they couldn't see anything wrong with my neck except some disk sparing of the C6 and C7 Region, but nothing that would cause my symptons, also the lightheadedness got better the less my neck hurt, And my neck hurt for several months, I told this all to doctor after doctor, but they suggested my neck had nothing to do with it and it was most likely my heart.. But as of 2 about to months ago, my neck stoped hurting and low and behold no light headedness. Thats also why I agreed with my GP and stoped taking my betablocker, But now with the weird fluttering at night, I wonder if I should Have Stoped It.. But It makes me feel at ease that It also dosent sound serious.. Thanks for your thoughts hank..