type 1 - occurs particularly in patients with underlying thyroid disease; iodine induced excessive synthesis of thyroid hormone
type 2 - destructive thyroiditis (amiodarone induced); occurs in patients with no previous underlying thyroid disease; thyroiditis results in release of thyroid hormones into the circulation
diagnosis
suppressed TSH levels; increased T3 and T4
fine needle aspiration - will yield evidence of thyroiditis
treatment
if possible withdrawal of amiodarone - note that withdrawal has no immediate effect because of very long half life of amiodarone
type 1 - first line therapy is use of antithyroid drugs; steroid treatment may be used in addition
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