"There are two types of amiodarone-induced thyrotoxicosis 1-3:"
"There is increased morbidity in amiodarone-induced thyrotoxicity, mainly due to the effect of hyperthyroidism in patients with underlying chronic heart disease, particular with left heart failure 1-3."
"occurs in an abnormal thyroid gland (e.g. multinodular goitre, Graves disease)"
"type 1: goitre, nodules, hyperechoic parenchyma; increased vascularity"
"type 2: normal or hypoechoic thyroid parenchyma; reduced vascularity"
"Type 1 amiodarone-induced thyrotoxicosis requires anti-thyroid treatment (e.g. thioamides and/or potassium/sodium perchlorate) as it rarely spontaneous regresses even when amiodarone treatment is ceased 1. Type 2 is usually less symptomatic and spontaneously resolves in 20% of patients; when treatment is required, glucocorticoids are indicated 1. Surgery (thyroidectomy) can be considered for patients with treatment-refractory thyrotoxicosis or low ("