A 33-year-old woman presented with tiredness, palpitations, weight loss and emotional lability 9 weeks after the birth of her third child.
On examination, she had a sinus tachycardia, a fine tremor, slight lid retraction and a mild diffuse non-tender goitre.
Investigations:
serum thyroid-stimulating hormone<0.01 mU/L (0.4C5.0)
serum free T434.3 pmol/L (10.0C22.0)
technetium-99m scan of thyroid (20-min uptake)<1% (0.4C3.0)
What is the most appropriate treatment?
A . aqueous iodine oral solution
B . carbimazole
C . potassium perchlorate
D . propranolol
E . propylthiouracil
Answer: D