<s>[INST] i had an abnormal ecg when my eltroxin medication was introduced at too high of a dosage. that was 15 months ago. all tests were done on my heart at the time and everything was fine. i have now had another abnormal ecg having had my medication reduced by half for the past week. should i be worried. i hope to fly to chicago on saturday [/INST] Hello, After going through your medical query I understand your concern and I would like to tell you that if your heart analysis came back normal then you need not worry about your cardiac health. Check your TSH level and consult a physician with reports. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Bhanu Partap, Cardiologist </s>