Multiple Sclerosis
Multiple sclerosis (MS) is an immune‑mediated, inflammatory demyelinating disease of the central nervous system that causes focal plaques in the brain and spinal cord, leading to episodic and/or progressive neurological dysfunction.
MS commonly presents to emergency services with new focal deficits (including optic neuritis), spinal cord syndromes or symptom deterioration from intercurrent illness.
Emergency clinicians must recognise red flags and mimics, initiate safe acute management, treat reversible precipitants, and arrange timely neurology assessment and imaging in line with national guidance (NICE NG127 and NG220).
Epidemiology and pathophysiological points relevant to ED care
- Typical onset: young adults (peak in the 20s-40s); female predominance (~2:1).
- Geographic and environmental factors (for example, low childhood vitamin D) influence risk; Epstein-Barr virus infection is a well‑established associated trigger.
- Disease mechanisms: focal T‑ and B‑cell mediated demyelination with secondary axonal injury. Demyelinated segments slow or block conduction and are temperature sensitive (Uhthoff phenomenon - symptom worsening with heat, fever or exercise).
- Plaque distribution in periventricular white matter, optic nerves, brainstem, cerebellum and spinal cord accounts for the heterogeneous presentations seen in the ED.
Clinical patterns - practical classification
- Clinically isolated syndrome (CIS): a single episode suggestive of demyelination; may evolve to MS.
- Relapsing-remitting MS (RRMS): discrete relapses with partial or complete recovery (most common).