What combination of signs and symptoms is typical of Wernicke's encephalopathy?

• A. Mental status changes, confusion, nystagmus, gait ataxia, polyneuritis
• B. Fever, rash, photophobia
• C. Cough, dyspnea, chest pain
• D. Nausea, vomiting, diarrhea

Answer: (A)

Wernicke's encephalopathy arises from thiamine (vitamin B1) deficiency and is an acute neurologic emergency. It typically presents with a triad of symptoms that reflect its effects on the brain: mental status changes such as confusion or disorientation, ocular motor abnormalities like nystagmus or ophthalmoplegia, and gait ataxia. The combination described includes mental status changes, nystagmus, and gait ataxia, which aligns with the hallmark features of this condition. While polyneuritis can occur with nutritional deficiencies, it is not the defining sign of Wernicke's encephalopathy, so the other options do not fit this syndrome. The fever/rash/photophobia pattern points to infectious processes of the CNS, the respiratory pattern suggests lung disease, and the GI pattern suggests gastroenteritis, none of which capture the characteristic neurologic triad. Early recognition and prompt thiamine administration are crucial to prevent progression to Korsakoff syndrome and other complications.