A 45-year-old woman with Hashimoto thyroiditis on levothyroxine 100 mcg daily presents with recurrent symptoms of fatigue and cognitive impairment despite a TSH of 1.5 mIU/L (within normal range) and free T4 of 1.0 ng/dL (low-normal). She requests a trial of combination levothyroxine-liothyronine therapy. Which of the following best explains why this is NOT recommended?
- A)Liothyronine has a short half-life requiring multiple daily doses and causes fluctuating T3 levelsGABARITO
- B)TSH-suppressive therapy with high-dose levothyroxine is superior to combination therapy
- C)Her symptoms are pathognomonic for central hypothyroidism requiring thyrotropin-releasing hormone
- D)Liothyronine increases the risk of Graves disease conversion
- E)Combination therapy is contraindicated in patients over 40 years old
Explicação
Combination levothyroxine-liothyronine therapy is not routinely recommended for primary hypothyroidism. Liothyronine (T3) has a short half-life (1-2 days) requiring multiple daily doses, producing fluctuating serum levels that may worsen symptom control compar... Ver explicação completa e trilha adaptativa →