LAUSR

Dr. Jiwon Yang: A 41-year-old woman was admitted to this hospital because of palpitation and general weakness. The symptoms had lasted for about one week. She also complained of diaphoresis and dizziness. Her heart rate was increased to 110 beats per minute with normal blood pressure (127/61 mmHg), respiratory rate (20/min), and body temperature (36.9°C). Heart sounds were normal without murmurs. Complete blood count and blood chemistry showed no specific findings. Her thyroid function tests showed thyrotoxicosis: free thyroxine (free T4) of more than 12 ng/dL, total triiodothyronine (T3) of more than 8 ng/mL, and thyroid stimulating hormone (TSH) of less than 0.008 uIU/mL. An electrocardiogram showed increased heart rate (102/min) with sinus rhythm. Chest radiograph showed clear lungs with normal cardiac and mediastinal silhouette.