The conversation between human and AI assistant.
[|Human|] 60 yr female, history of graves disease, off medication for 8 yrs. While at work felt light headed and on taking b.p. heart rate up to 194 per min. This did not go down, had to go to hospital and after medication rate went to normal. What apart from thyroid, could be causing this. I have never had this before.
[|AI|]  Dear Mrs, People with graves disease are tended to develop some arrhythmias. If they are very fast, as in your case, it can cause lightheadedness and low blood pressure. Just don't panic, in the majority of cases, arrhythmias may be controlled with medications. See your doctor to do another ECG, 24 hours ambulatory ECG and to prescribe a treatment. Take fearsome back if you have any further questions
