Module 4.2.2 (Management of Multiple Sclerosis) Flashcards
How to diagnose MS?
Presence of typical lesions throughout the CNS, shown clinically and on MRI (McDonald criteria)
- If initial MRI shows two or more white matter lesions, the patient has about an 80% risk of developing MS, if the MRI is normal –> risk falls to about 11%
> MS can be diagnosed after a single clinical event if the MRI shows lesions of different ages
No preventative therapies in primary and seconday progressive MS. True or False
True
What is a clinically isolated syndrome?
Some patients have a single demyelinating event without evidence of changes over time (no new lesions on MRI or no new clinical events)
Types of MS?
Relapse remitting MS (RRMS): unpredictable attacks which may or may not leave permanent deficits followed by periods of remission
Primary progressive MS (PPMS): steady increase in disability without attacks
> average onset is approx 10 years later in PPMS than in relapsing MS
> those with PPMS tend to experience more problems with walking and more difficulty remaining in the workforce
> those with PPMs require more assistance with their everyday activities
Secondary progressive MS (SPMS): initial relapsing-remitting multiple sclerosis that begins to have decline without periods of remission
Progressive-relapsing MS (PRMS): steady decline onset with super-imposed attacks
What to do in relapsing forms?
Introduce immunotherapy early, to slow or minimise disability
AIM: no evidence of disease activity (NEDA), clinically stable, no relapses, no new lesions on MRI
What is used to acute inflammatory clinical events (relapses)?
Corticosteroids
What is the focus of MS therapy?
Ease symptoms caused by neurological damage (QOL)
Adherence to a healthy lifestyle
When to use immunotherapy in MS? What drugs are used?
Indicated for patients with relapsing forms of MS and active disease
> required expert management = risks vs benefits
Monoclonal antibodies (alemtuzumab, natalizumab, ocrelizumab)
- more potent but higher risk therapies
- started early in high risk patients
modern approach: use highly effective treatment early, to achieve NEDA (no evidence of disease activity)
What potency are oral immunotherapies such as dimethyl fumarate, fingolimod, teriflunomide, cladribine
Moderate potency
Why older drugs like interferon beta and glatiramer not used anymore?
Relapses more common than with other drugs
These drugs are rarely used, but when they may be used?
Rapidly progressive MS
When patient does not meet criteria for other therapies or C/Is
What are the three monoclonal antibodies used? What are their ADRs?
- Alemtuzumab
ADR: infusion reactions, thyroid dysfunction, blood dyscriasis, anti-GBM, kidney disease (rare), listeriosis (rare)
>licensed for RRMS
2. Natalizumab
ADR: infusion reactions, hypersensitivity reactions, infection (UTI,RTI), hepatotoxicity, progressive multifocal leukoencephalopathy (PML)
> monitor for PML and for JCV
> Progressive multifocal encephalopathy (PML) is a fatal demyelinating disease of the central nervous system (CNS) caused by JC virus
> PML occurs when the protective myelin coating on nerve cells in the brain breaks down, which leads to tissue damage. PML is incurable and can have severe physical effects. Complications include dementia, blindness, paralysis, and seizures.
3. Ocrelizumab
> License for RRMS (relapse remitting MS) and PPMS (primary progressive MS); only PBS subsidised for RRMS
ADR: hypersensitivity and infusion-related reactions, infection, transient neutropenia
What are the four main oral immunotherapies used? ADRs?
1. Dimethyl fumarate
ADR: NVD, flushing, leucopaenia, lymphopaenia, rash, itch, increased ALT/AST, proteinuria, PML
2. Fingolimod
ADR: bradycardia, transient 1st degree AV block, increased LFTs, blood dyscriasis, cough, dyspnoea, infection (e.g. shingles), mascular oedema, oppurtunistic CNS infections, PML
> may increase risk of major congenital malformations
>licensed for RRMR
3. Teriflunomide
ADR: N/D, alopecia, rash, infeciton, blood dyscriasis, neuropsychiatric effects, increased ALT/AST - hepatitis, hypersensitivity reactions, SJS, interstitial lung disease
> Washout procedures (activated charcoal or cholysteramine) in cases of toxicity (as for leflunonomide)
4. Cladribine
2 treatment courses, 12 months apart
Safety concerns: severe lymphopenia, infection, possible malignancy
ADR of interferon beta and glatiramer? What is license for?
Glatiramer acetate is indicated in treating relapsing-remitting type MS via a subcutaneous injection
Licensed for 1st demyelinating event suggestive of MS
interferon beta (interferon beta-1a and 1b; also peginterferon beta 1-b = similar efficacy)
ADR: injection site reaction, flu-like symptoms (use at night and use paracetamol to manage before), depression, elevated LFTs, blood dyscriasis, neutralising antibodies (reduced efficacy and loss of effect after 2 years)
glatiramer
ADR: injection site reactions, post-injection reaction, nausea, arthralgia, oedema, hypertonia, tremor, anti-glatiramer Abs
Symptoms of mild and moderate/severe relapse of MS?
Mild Relapses (tingling in extremities)
- No disability
- No signs of neurological symptoms
- May include pain, fatigue, bladder and bowel symptoms, spasticity, psychiatric symptoms, sexual dysfunction
> reassure the patient and monitor to ensure resolution
Moderate to severe relapses
- Are disabling
- Typically occur over hours to days
- Usually objective - you can see that the patient has deteriorated; neurological signs are consistent & progressive and can be localised to part of the brain
Neurological signs include:
Ataxia
Facial and limb numbness
Limb weakness
Diplopia/double vision
Optic neuritis
Neuralgia
Loss of vision
Loss of bladder control
> high-dose corticosteroids— intravenous therapy is preferred. Oral formulations have slightly more adverse effects (eg insomnia) but are convenient when intravenous therapy is not available
> Intravenous formulations can be given as a day-patient, but severe relapses warrant admission for multidisciplinary care