A 45-year-old man develops ascending weakness over 4 days following a respiratory infection. Examination shows areflexia in the legs and mild foot dro...

Question

A 45-year-old man develops ascending weakness over 4 days following a respiratory infection. Examination shows areflexia in the legs and mild foot drop. Sensation is mildly reduced in a stocking distribution. Suspected Guillain-Barré syndrome is raised. What is the most appropriate next diagnostic step?

Accepted Answer

Immediate lumbar puncture and CSF analysis

Answer

Nerve conduction studies and electromyography

Answer

MRI brain with contrast

Answer

Serum creatine kinase level only

Answer

Muscle biopsy

ca-mccqe1 MCQ (SBA): Guillain-Barré syndrome