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Flashcards in Exam 3 likely questions for exam Deck (18):

what is the drug of choice for thyroid hormone replacement?



besides hypothyroidism what else is levothyroxine indicated for?

For TSH suppression in select nodules and thyroid cancers


what does long term elevation of T4 (from high dose replacement or hyperthyroidism) increase the risk of?

may accelerate cardiac disease and osteoporosis


What is important about treating Addison's disease patients with hypothyroidism?

Thyroid hormone replacement must be done with cortisol, otherwise it is FATAL!


What are the equivalent doses of thyroid hormone? (synthroid, armour, and cytomel)

100 mcg of T4 (Synthroid) ~ =
60 mg Thyroid USP (Armour) ~ =
25 mcg of T3 (Cytomel)


the most common cause of hyperthyroidism is called?

Grave's Disease (autoimmune)-- antibodies stimulate TSH receptors


hyperthyroidism due to graves disease is usually accompanied by what?

goiter and exophthalmos
also: pretibial myxedema


what is the definitive tx for hyperthyroidism?

surgical removal or radioactive ablation of thyroid gland


How are the MOA of methimazole and PTU similar? different?

they both inhibit the transformation of inorganic iodine to organic iodine blocking the production of thyroxine and inhibiting the formation of T3 and T4.

**PTU blocks the peripheral conversion of T4 to T3 while methimazole has minimal effects.


what is the most feared side effect of methimazole or PTU?



what category is PTU?

Category D, considered safer than methimazole (and used in pregnancy only when benefit out weighs risk)


Does propanolol affect the thyroid gland?

No, it mitigates sxs such as anxiety, tremors, palpitations, etc.


MOA of iodine/SSKI?

large doses of iodine inhibit the release of thyroxine from thyroid gland


how long is iodine/SSKI effective for?

2-3 weeks as the thyroid gland adapts and resumes secretion of thyroxine.


what category drug is radioactive iodine (131 I)

Category X, given during pregnancy can irreversibly damage the fetal thyroid tissue. When given to a nursing mother, radioactive iodine can reach a baby through the breast milk


How are men effected by radioactive iodine?

Men who receive RAI treatment for thyroid cancer may have decreased sperm counts and temporary infertility for periods of roughly two year


what is the most severe manifestation of hyperthyroidism?

Thyroid storm


what are some signs of thyroid storm?

high fever, irritability, delirium, vomiting, diarrhea, dehydration, hypotension and vascular collapse.
(Coma and death may occur...too late for signs then!)