Bradycardia with HYPERthyroid?

I am a 47 year old female and for the last four years I have been having bradycardia. At first it was believed to be medication related but I have been of all meds for over a year now. My bradycardia is getting worse 40bpm and in the 40's. Resently I was tested for thyroid levels and they came back with a TSH of 12. I am told this is unusal with bradycardia. I am exhausted and weak all the time. What can cause these two things together? I also have a Avm in the right frontal lobe of the brain and have some artieries that are smaller than normal and have been told that my blood takes a different blood flow route than the normal. Hopefully this history will help. If I can get any info about this condition it would be helpful. Thank you

[Mark Lupo, M.D.]

A TSH of 12 is hypOthyroidism (underactive) which can be associated with low heart rate and should be fixed before considering pacemaker placement for symptomatic bradycardia.