A 36-year-old woman presented with a recent history of shortness of breath, weight loss, tremor, diaphoresis, and palpitations. Examination findings included tachycardia, a diffusely enlarged thyroid gland, brisk reflexes, and no exophthalmos. Laboratory results included a below-normal thyroid-stimulating hormone level and elevated levels of free thyroxine and free triodothyronine. The patient underwent imaging to evaluate her dyspnea. What would you do next?