Autonomic Pharmacology USMLE Step 1 Practice Question
A 32-year-old woman with newly diagnosed Graves disease presents with tremor, palpitations, and anxiety. Vital signs show BP 148/92 mmHg, HR 112 bpm, RR 18, temperature 37.8°C, and SpO2 98%. TSH is suppressed at 0.01 mIU/L with elevated free T4 of 28 pg/dL. She denies chest pain. She receives a medication for rapid symptomatic control while awaiting definitive therapy. Which of the following additional effects is most characteristic of this medication?
Answer choices
- AIncreased release of thyroid hormone from follicles
- BCompetitive inhibition of thyroid peroxidase
- CDestruction of thyroid tissue by beta emission
- DDecreased peripheral conversion of T4 to T3Correct answer
- EBlockade of sodium iodide uptake
- FInhibition of thyroid hormone receptor binding in target tissues
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