This lesson introduces hyperthyroidism, explains how it differs from thyrotoxicosis and hypothyroidism, and describes its effects on the body.
Hyperthyroidism is an endocrine disorder in which the thyroid gland produces excessive thyroid hormones. Thyrotoxicosis means elevated thyroid hormone levels in the body, whatever the cause; it includes hyperthyroidism but can also result from causes outside excess production by the gland. The terms are sometimes used interchangeably, but they are not always identical.
All flashcards
How do hyperthyroidism and thyrotoxicosis differ?
Hyperthyroidism is excessive thyroid hormone production by the gland; thyrotoxicosis is elevated thyroid hormone in the body from any cause.
What blood-test pattern commonly indicates overt primary hyperthyroidism?
Low TSH with elevated T4 and/or T3.
What role do beta blockers have in hyperthyroidism?
They can reduce symptoms such as palpitations, rapid pulse, tremor, and anxiety, but generally do not treat the underlying hormone overproduction.
What is a common long-term outcome of radioiodine treatment?
Reduced thyroid function, which is usually managed with synthetic thyroid hormone such as levothyroxine.
What is thyroid storm?
A rare, life-threatening worsening of thyrotoxicosis that requires emergency hospital care.
Quiz questions
A patient has low TSH and elevated free T4. Which interpretation best fits this pattern?Answer: Overt primary hyperthyroidism
Which test result is characteristic of subclinical hyperthyroidism?Answer: Low TSH with free T4 within the normal range
Which test can support Graves' disease as the cause of hyperthyroidism?Answer: TSH-receptor antibody testing
When antithyroid medication is needed during the first trimester of pregnancy, which medicine is generally preferred?Answer: Propylthiouracil (PTU)
How can thyroiditis cause a temporary period of thyrotoxicosis?Answer: Inflamed or damaged thyroid tissue releases stored hormone.
Based on the Wikipedia article Hyperthyroidism, licensed CC BY-SA 4.0. Adapted into a summary, flashcards and quizzes.