Graves disease Quiz: Ace Your Exams

A 35-year-old woman presents to the emergency department due to palpitations and feeling that her heart is racing. She reports a 2-months history of restlessness, excessive sweating, and unintentional weight loss of 3 kg. Past medical history is unremarkable. Family history is significant for celiac disease in her mother. Temperature is 37.2°C (99°F), blood pressure is 140/78, pulse is 136/min, respiratory rate is 20/min, and oxygen saturation is 97% on room air. On physical examination, the patient appears restless. A fine tremor is seen when her hands and fingers are outstretched. The ECG is shown below. The remainder of the physical examination is most likely to show which of the following?
 
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