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A 37-year-old man is admitted to a hospital with mental confusion and disorientation. His wife reports he became more irritable and forgetful in the past year. In addition, she notes that he became a vegan a year ago, and currently, his diet consists of starchy foods like potatoes, corn, and leafy vegetables. GI symptoms include anorexia, diarrhea and vomiting. He has glossitis and skin lesions that appear as vesicles over the extremities. Eczema-like lesions around the mouth, as well as desquamation and roughened skin over the hands, are also present. Neurologic examination reveals symmetrical hypesthesia for all types of sensation in both upper and lower extremities in a ’’gloves and socks” distribution. Deficiency in the diet the of which of the following amino acids is the most likely cause of this condition?

Питання КРОК 1 (медицина) · тест з варіантами та поясненням · Medus

EN: A 37-year-old man is admitted to a hospital with mental confusion and disorientation. His wife reports he became more irritable and forgetful in the past year. In addition, she notes that he became a vegan a year ago, and currently his diet consists of starchy foods like potatoes, corn, and leafy vegetables. GI symptoms include anorexia, diarrhea and vomiting. He has glossitis and skin lesions that appear as vesicles over the extremities. Eczema-like lesions around the mouth, as well as desquamation and roughened skin over the hands, are also present. Neurologic examination reveals symmetrical hypesthesia for all types of sensation in both upper and lower extremities in a "gloves and socks" distribution. Deficiency in the diet of which of the following amino acids is the most likely cause of this condition?

Варіанти відповідей

  1. Histidine
  2. Threonine
  3. Tryptophan
  4. Arginine
  5. Lysine

Answer options (EN)

  1. Histidine
  2. Threonine
  3. Tryptophan
  4. Arginine
  5. Lysine

Правильна відповідь

Tryptophan

Пояснення

Клініка відповідає пелагрі (дефіцит ніацину/вітаміну PP). Ніацин може утворюватися з триптофану; при обмеженій рослинній дієті з малою кількістю триптофану розвивається дефіцит. Глосит, дерматит, діарея та нейропатія «рукавички-шкарпетки» типова для пелагри. Інші амінокислоти не пояснюють цю комбінацію.

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