A 71-year-old woman taking levothyroxine reports palpitations and weight loss. TSH is 0.04 mIU/L and free T4 is mildly elevated. ECG shows atrial

Question

A 71-year-old woman taking levothyroxine reports palpitations and weight loss. TSH is 0.04 mIU/L and free T4 is mildly elevated. ECG shows atrial fibrillation. She previously increased her dose after fatigue. Which of the following is the most likely explanation for this patient's findings?

Accepted Answer

Excess thyroid hormone replacement

Answer

Subacute bacterial thyroiditis

Answer

Iodine deficiency

Answer

Amiodarone-induced hypothyroidism

Answer

Pituitary TSH hypersecretion

Hypothyroidism overtreatment — USMLE Step 3 MCQ

A 71-year-old woman taking levothyroxine reports palpitations and weight loss. TSH is 0.04 mIU/L and free T4 is mildly elevated. ECG shows atrial fibrillation. She previously increased her dose after fatigue. Which of the following is the most likely explanation for this patient's findings?