Multiple Sclerosis Flashcards
What is the prevalence of MS in Scotland?
Scotland has the highest prevalence in the world. Approx. 1 in 600 people have MS
What is multiple sclerosis?
It is an inflammatory demyelination disease of the CNS which has acute episodes of inflammation which are associated with focal neurological deficits such as weak leg, visual loss and urinary incontinence.
The deficits develop gradually and last for more than 24 hours and can gradually improve.
What are the different subtypes of multiple sclerosis?
- Relapsing remitting MS,
- Primary progressive MS (doesn’t have attacks)
- Secondary progressive MS (initial relapsing-remitting but then continues to progress without attack)
- Benign multiple sclerosis
What are some symptoms which may develop into MS?
- Optic neuritis,
- Transverse myelitis
- Clinically isolated syndromes
- Radiologically isolated symptoms
What is optic neuritis?
- Inflammation and demyelination of the optic nerve.
- Painful vision loss that comes on over a few days and may resolve.
- Increased risk of developing MS
What is Transverse myelitis?
- Inflammation of the spinal cord which may cause weakness, sensory loss or urinary incontinence or sexual dysfunction.
- Can occur secondary to a viral infection
What are clinically isolated syndromes in the context of MS?
- A single episode of neurological disability due to focal CNS inflammation. It can include optic neuritis or transverse myelitis
- May be the first attack of MS
What are radiologically isolated symptoms in the contect of MS
- When brain scans show clinical features of MS but the patient doesn’t have the signs or symptoms.
- Usually an incidental finding and not all patients will definitely develop MS
What virus has a strong association with multiple sclerosis?
EBV
What is the diagnostic criteria of multiple sclerosis?
- 2 or more episodes of demyelination dissemination in space and time
When should you suspect MS (What are the symptoms)
- Neurological symtpoms which develop over a few says, last for more than 24 hours and then spontaneously resolve. This can include:
- Optic neurtitis,
- Bell’s Palsy,
- Labyrinthitis,
- Sensory symptoms,
- Bladder symptoms in young men/women w/o children.
- Main symptoms are: fatigue, cognitive impairment, nystagmus, diplopia, dysarthria, dysphagia, muscle weakness/spasm/ataxia, paraesthesia, incontinence
What are contraindications for a MS diagnosis?
- Sudden onset,
- Peripheral signs such as Areflexia, muscle waiting, fasciculations.
- Major cognitive impairment,
- Reduced consciousness,
- Prominant seizures,
- Pyrexia
- Normal MRI scan
What are the investigations for suspected MS?
- MRI brain and cervical spine with gadolinium contrast,
- Lumbar puncture to look for CSF oligoclonal bands, cell count, glucose and protein.
- Bloods - B12/folate, ACE, Lyme serology, ESR/CRP, ANCA/ANA/Rhumatoid factor.
- Visual evoked potentials - slow conduction in optic nerve if there has been optic neuritis
- Chest x ray to exclude sarcoidosis
What are oligoclonal bands?
- Immunoglobulin band seen on electrophoresis of blood and spinal fluid.
- if present in spinal fluid but not blood then it suggests immunoglobulin production/inflammation in CNS
What is the definition or relapse vs psuedo-relapse
Relapse - New neurological deficit which lasts more than 24h without pyrexia/infection.
Pseudo-relapse - re-emergence of previous neurological symptoms related to an area of old demyelination in the context of heat/infection
