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A 35-year-old man presents with sudden onset of generalized weakness and difficulty walking. He has no history of trauma. Vital signs are normal. Neurological examination reveals bilateral symmetrical muscle weakness with preserved sensation.

1. List important differential diagnoses for acute generalized weakness. 4 marks

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2. List and justify key initial investigations in the ED. 4 marks

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3. List and justify red flags suggesting urgent intervention or escalation of care is required. 4 marks

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