27th June 2023

A 65-year-old woman first presents with a 3-day history of vomiting and diarrhoea

A 65-year-old woman first presents with a 3-day history of vomiting and diarrhoea. She is treated with IV fluids and antiemetics and discharged home. The following day she starts to develop weakness affecting her lower limbs which progresses over the next few days. MRI of the brain is normal. Lumbar puncture CSF sample shows raised protein count. She subsequently develops respiratory failure, requiring intubation and ventilation.

Select the SINGLE most appropriate treatment from the list below. Select ONE option only.