Table 1: Comparison of the patient’s findings before and after treatment with radioiodine.

Before treatment After treatment Serum TSH <0.01 μIU/mL 0.6 μIU/mL Serum T4 40.6 μg/dL 12.0 μg/dL Pulmonary artery systolic pressure 70 mm of Hg 45 mm of Hg