Thyroid Disorders: Hyperthyroidism Treatment

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What is the primary mechanism of action of radioactive iodine in the treatment of hyperthyroidism?

Stimulating the production of thyroid-stimulating hormone (TSH) from the pituitary gland
Increasing the uptake of iodine in the thyroid gland
Irradiating thyroid parenchyma and causing pycnosis and necrosis of follicles (correct)
Inhibiting the release of thyroid hormones from the thyroid gland

What is the typical duration of improvement in hyperthyroidism after radioactive iodine treatment?

Within 2-3 weeks
Within 6-8 months
Within 2-3 months (correct)
Within 1-2 years

What is a contraindication for the use of radioactive iodine in the treatment of hyperthyroidism?

Pregnancy (correct)
Grave's disease
Older age
Heart disease

What is the half-life of radioactive iodine I123?

13 hours (A) Signup and view all the answers

What is the effect of human chorionic gonadotropin (hCG) on thyroid function in pregnancy?

It causes hyperthyroidism (D) Signup and view all the answers

What is the treatment of choice for hyperthyroidism caused by antibodies in pregnancy?

Propylthiouracil (B) Signup and view all the answers

What is the primary purpose of administering iodine preoperatively in hyperthyroidism?

To reduce the vascularity of the thyroid gland before surgery (C) Signup and view all the answers

What is the role of iodine in thyrotoxic crisis?

It reverses the effects of radioactive iodine (D) Signup and view all the answers

What is a common side effect of chronic iodine overdose?

Iodism (D) Signup and view all the answers

What is the typical dosage of iodine administered as Lugol's solution in hyperthyroidism?

1-3 drops tds (D) Signup and view all the answers

What is the purpose of administering thionamides before iodine in hyperthyroidism treatment?

To induce euthyroidism before iodine administration (D) Signup and view all the answers

What is the primary cause of cretinism?

Hormone deficiency during pregnancy (C) Signup and view all the answers

What is the purpose of iodine supplements in areas with iodine deficiency?

To prevent cretinism (C) Signup and view all the answers

What is the term used to describe the hyperfunction of the thyroid gland itself?

Thyrotoxicosis (D) Signup and view all the answers

What is the mechanism of action of thionamides in the treatment of hyperthyroidism?

They prevent the formation of T3 and T4 (D) Signup and view all the answers

What is the effect of high doses of iodine on the thyroid gland?

It blocks the secretion of T3 and T4 (A) Signup and view all the answers

What is the characteristic sign of myxoedema coma?

Severe hypothermia (A) Signup and view all the answers

What is the function of radioactive iodine treatment in hyperthyroidism?

To destroy part of the thyroid gland (D) Signup and view all the answers

What is the term used to describe the condition of increased T3 and T4 levels?

Hyperthyroidism (B) Signup and view all the answers

What is the effect of amiodarone on the thyroid gland?

It causes destructive thyroiditis (D) Signup and view all the answers

What is the term used to describe the condition of decreased T3 and T4 levels?

Hypothyroidism (C) Signup and view all the answers