Neurology Flashcards
What are the common causes of a migraine?
C- chocolate and certain foods H - hormones e.g. menstrual cycle O- oral contraceptive pill C- caffeine O- obesity L- lie ins - too much or too little sleep A- alcohol T- trauma, head injury E- exercise S - stress
What are common triggers for a migraine?
too little/ too much sleep stress hormonal e.g. menstrual migraine, menopause eating e.g. skipping meals minor head injuries
How long does a migraine commonly last?
4 hours - 72 hours
What is the diagnostic criteria of a migraine?
AT LEAST 2 OF: unilateral pain throbbing/ pulsating pain moderate-severe intensity motion sensitivity
AT LEAST 1 OF:
nausea/ vomiting
photophobia/ photophobia
normal examination
What is a migraine with an aura?
aura precedes the migraine, with symptoms changing as wave of spreading neuronal depression moves across cortex and focal neurological deficit
e.g. visual aura (loss of vision, shimmering, zig zag lines), motor aura (pins and needles, dysarthria, ataxia, hemiparesis), somatosensory
How are acute attacks of migraines managed?
- simple analgesics e.g. NSAIDs, paracetamol
- triptans + paracetamol e.g. sumatriptan
- avoid trigger
- anti emetics (even if not feeling nausea) e.g. prochloroperazine, metachlorpramide
How can migraines be managed long term if they are frequent and affecting quality of life?
- beta blockers e.g. propanolol
2. anti convulsants e.g. topiramate
Which group of people tend to get cluster headaches?
high alcohol intake
smoking
men 20-40 y/o
If a patient presents with a unilateral headache around one eye that has become watery/ bloodshot and has been several months without a headache, what is the most likely diagnosis?
cluster headache
What is the typical pattern of frequency of a cluster headache?
once/ twice daily headaches for 4-12 weeks and then non headaches for several months
What symptoms other than unilateral headache around one eye is associated with cluster headaches?
rhinorrhoea vomiting Horners syndrome agitation, pacing around congestion of sinuses
eye symptoms: watery, blood shot, lid oedema, lacrimation
What is the acute management of a cluster headache?
subcut sumatriptan + high flow oxygen (12-15L per min via non breathe mask for 15 mins)
What are the risk factors for getting tension headaches?
stress noise concentration/ visual effort fumes/ smells depression
If a patient presents with a bilateral headache that lasts for hours-days and is dull/diffuse and non pulsatile, what is your diagnosis and what other symptoms would you ask about?
TENSION HEADACHE
chronic tight banding pain scalp tenderness pressure behind eyes worse at the end of the day spreads to neck
How are tension headaches managed?
avoid causative factors
analgesics e.g. paracetamol, NSAIDs, aspirin (avoid opioids)
supportive care e.g. massage, ice packs
preventative measures - acupuncture, low dose amitriptyline
What is temporal arteritis?
CHRONIC VASCULITIS OF LARGE/ MEDIUM VESSELS: granulomatous inflammation affecting the branches of external carotid artery, including the superficial temporal artery
What are the main clinical features of temporal arteritis?
- unilateral headache/ pain over non pulsatile temporal arteries, thickened skin
- visual loss - amaurosis fugax
- jaw claudication
- scalp tenderness e.g. brushing hair causes pain
+ fever, fatigue, weight loss, polymyalgia rheumatic
How is temporal arteritis diagnosed?
- raised ESR
2. temporal artery biopsy - granulomatous inflammation, skip lesions
How is temporal arteritis managed?
high dose corticosteroids 60mg e.g. prednisolone + urgent referral to ophthalmology (if eye symptoms)
(give gastric and bone protection e.g. PPI, bisphosphonates)
steroids gradually reduced over time
How is Huntingtons disease inherited?
autosomal dominant disorder
complete penetrance - all gene carriers have the disease
What is the underlying pathology of Huntingtons disease?
expanded trinucleatide repeat (CAG= huntingtin gene) on chromosome 4
each generation, the repeat increases in length causing a younger age of onset and worse phenotype
causes a loss of GABA and cholinergic neurones in the striatum of the basal ganglia
How does Huntingtons disease first present “prodrome”?
personality change and lack of coordination
What are the main symptoms of Huntingtons disease?
presents usually > 35 y/o
personality/behavioural change = irritable, depression, antisocial
chorea (jerky involuntary movements) = affects face/trunk/limbs, dystonia, grimacing, gait problems
dementia - late
How is Huntington’s disease diagnosed?
genetic testing - CAG repeats
How is Huntington’s managed?
no treatment prevents progression or cures
- dopamine blocking drugs e.g. tetrabenazine for chorea
- MDT approach - counsel family, SALT, physiotherapists, OT, palliative care
List the MDT members that are involved in managing a patient with Huntington’s disease
speech and language therapists physiotherapists dieticians occupational therapists psychologists palliative care team counsellors for family
List the causes of parkinsonian symptoms
Lewy body dementia
side effects of drugs e.g anti-psychotics, metaclopramide
vascular disease
tumour in basal ganglia
parkinsons plus syndrome e.g. young onset Huntingtons, spinal cerebellar ataxia, progressive supra-nuclear palsy, normal pressure hydrocephalus
What is the pathology behind parkinsons disease?
degeneration of dopaminergic neurones in the substantial nigra
lewy bodies found in brain stem which contain alpha synuclein and ubiquitin
What are the cardinal features of parkinsons disease?
T- tremor
R- rigidity
A- akinesia/ bradykinesia
P - postural instability
List the clinical symptoms and signs of parkinsons disease
TREMOR - unilateral, pill rolling, resting
RIGIDITY - cogwheel, increased muscle tone
BRADYKINESIA- slow to initiate movements
SPEECH- slow, monotone, quiet, slurred
GAIT- reduced arm swing, shuffling, apraxic, slow to initiate movement
PSYCHIATRIC- depression, dementia, psychosis
REM SLEEP DISTURBANCE
AUTONOMIC SYMPTOMS- urinary frequency, constipated, drooling, postural hypotension, falls are late sign
How is parkinsons disease diagnosed?
clinical examination
dopamine transporter imaging - use radioactive labelled ligand binding to assess extent of nigrastriatal loss
How is Parkinson’s managed with medication?
1st line if have motor symptoms = levodopa e.g. L-dopa + decarboxylase inhibitor (carbidopa)
1st line if no motor symptoms= dopamine agonist e.g. ropinirole, bromocriptine or MAO-I e.g. seligilene
How does levodopa work?
levodopa crossed the blood brain barrier and enters nigrostriatal neurones and converted to dopamine
combined with decarboxylase inhibitor to reduce peripheral adverse effects and prolong half life
What are the side effects of levodopa?
chorea, dyskinesia, reduced efficacy over time, dry mouth, palpiatations, postural hypotension
Name some examples of dopamine agonists and what are their possible side effects?
e.g. ropinirole, pramipipexone, bromocriptine, cabergoline
psychosis, compulsive/addictive behaviour, gambling, risky behaviour, postural hypotension, excessive day time sleeping
if Ergot derived, then at risk of cardiac, pulmonary and retroperitoneal fibrosis
Describe an astrocytoma?
type of glioma
most common primary brain tumour
arise from astrocytes
Describe glioblastoma multiforme and what is the prognosis with this tumour?
highly malignant
no cell differentiation
life expectancy is <1 year
Describe an ependyoma?
derived from ependymal cells and chord plexus
better survival rate than other gliomas
List the different types of intracranial tumours
- gliomas
- meningiomas
- primary central nervous system lymphoma
- neurofibromas and schwannomas
- haemangioblastomas
- metastasis
Describe meningiomas
mostly benign tumours
arise from arachnoid membrane and granulations
compress adjacent brain structures
Who are primary central nervous system lymphomas most common in?
males
>60 y/o
immunocompromised patients
What are the most common types of pituitary tumours?
prolactinomas
growth hormone secreting adenomas
ACTH secreting adenomas
Which tumour might you suspect if a patient presents with visual symptoms e.g. bitemporal hemianopia
pituitary tumour - they comprises on the chiasma to cause visual symptoms
Describe haemangioblastomas
derived from blood vessels
occur in cerebellar parenchyma or spinal cord
associated with von hippie lindau disease, tumours in retina
Describe the classic triad of symptoms of raised intracranial pressure
- headache
worse on waking, coughing, bending forward, wake up at night - vomiting
- papilloedema
What is a colloid cyst?
cyst in 3rd ventricle that obstructs CSF flow out of the ventricle -> increases ICP -> rapidly fatal in hours
If a patient presents with a headache worse on bending forwards, what tumour might you suspect?
colloid cyst
Describe “cushings triad” of signs of raised intracranial pressure
- irregular respiratory rate
- bradycardia
- hypertension
What symptoms does herniation cause?
impaired consciousness
respiratory depression
bradycardia
death
Define coning
compression of medulla by herniation of the cerebellar tonsils through the foramen magnum
Describe “false localising signs” and why are these important?
important as indicate increase in brain pressure with brain shift and urgent surgery is required
6th nerve palsy
3rd nerve palsy
hemiparesis on same side as tumour
How do intracranial tumours present?
- effects of raised intracranial pressure
= classic triad (headache, papilloedema, vomiting), herniation, false localising signs - focal neurological signs
= caused by direct effects of tumour and effects depend on site of tumour - diffuse cereal symptoms
e. g. seizures, cognitive symptoms - tiredness
What are the risk factors for developing MS?
first degree relatives
viral infections can precipitate e.g. EBV, HHV
low levels of vitamin D and lack of sunlight - living further away from equator
women
smoking
Describe the pathology behind MS
- autoimmune T cell mediated demyelination of oligodendrocytes (white matter)
- gliosis (scarring)
- axonal loss
- conduction loss and progressive disability
What are the core symptoms of MS?
VISUAL- optic neuritis (painful eye on movement, reduce visual acuity over days, difficulty distinguishing colour, worse on heat exposure, eye pain at rest )
SENSORY - numbness, tingling, Lhermittes sign (electrical impulse down back when bend head), Uhtoffs phenomenon (symptoms worse in hot bath)
MOTOR - spastic weakness, tremor, ataxia, clumsy
OTHER SYMPTOMS - urinary incontience, neuropathic pain, fatigue, depression, sexual dysfunction
What are the later signs of MS?
spastic tetra paresis nystagmus urinary incontinence pseudo bulbar palsy cognitive impairment
What are the 4 different clinical patterns of MS presentation?
- relapsing remitting (80%)
- primary progressive (10-20%)
- secondary progressive
- progressive relapsing
Describe the relapsing remitting MS presentation?
most common type
symptoms occur in attacks with a characteristic time course
unpredictable onset of attacks over days, recovery over weeks
steady increase in disability
Describe primary progressive MS presentation
gradually worsening disability without relapses or remission
usually presents later
10-20% of cases
Describe secondary progressive MS presentation
gradually worsening disability progressing over years
75% of relapsing remitting evolve to this after 30 years of onset
Describe progressive relapsing MS clinical pattern
steady decline since onset with super imposed attacks
<10%
How is MS diagnosed?
MRI - multiple lesions/ plaques across brain
CSF lumbar puncture- oligoclonal IgG bands
evoked potential testing
What is clinically isolated syndrome?
an example of one of the MS disease courses
it is the 1st episode of neurological symptoms lasting for 24 hours
in 70% of patients, they have lesions across brain in MRI and can develop MS
How are acute relapses of MS managed?
short course of steroids
IV methylprednisiolone 0.5g/day for 5 days
steroids can only be used twice a year
Which drugs are indicated for reducing relapse of relapsing remitting MS?
disease modifying drugs - beta interferon or glatiramer acetate
reduce relapse by 1/3 and reduce development of new MRI lesions
SE: flu like symptoms
Which drugs are used to treat more aggressive forms of MS?
MONOCLONAL ANTIBODIES e.g. alemtuzumab, natalizumab
prevents relapses and reduces disability
used in very agressive disease or when disease modifying drugs not working
What are the adverse side effects of monoclonal antibodies treating MS?
progressive multifocal leukoencephalopathy **
fatigue
autoimmune disorders
cardiotoxicity
Other than medical treatment, how should MS patients be managed?
MDT approach - physiotherapy, occupational therapy, psychological therapy , reviewed annually by specialist
Spasticity treated with baclofen
urinary incontinence treated with anti-muscarinics or botulinum toxin injection
fatigue treated with amantadine
Define Guillain Barre syndrome
acute inflammatory (immune mediated) demyelinating polyradiculopathy
How is GBS caused?
several weeks after an infection, for example:
food poisoning e.g. campylobacter jejuni **
HIV
vaccination
respiratory infection
How does GBS present?
distal paraesthesia** that ascends up lower limbs and body over days-weeks
symmetrical proximal weakness**
tingling, numbness
asymmetrical facial weakness
autonomic dysfunction - urinary retention, diarrhoea
What is a major concern with GBS?
if have cranial nerve involvement, at risk of intercostal muscle and diaphragmatic weakness -> RESPIRATORY FAILURE
What is Miller Fishers syndrome?
variant of GBS
symptoms include: ophthalmoplegia, ataxia, areflexia, descending paralysis ***
How is GBS diagnosed?
clinical history and examination
nerve conduction studies - slow
lumber puncture - CSF protein raised, normal cell count, mild lymphocytosis
How is GBS managed?
EMERGENCY!
IV immunoglobulin for 5 days
plasma exchange
+ continuous heart monitoring, regular vital capacity, refer to ITU for ventilation
What is meningitis?
inflammation and infection of the meninges
What are the main bacterial infectious causes of meningitis?
neisseria meningitidis
streptococcus pneumoniae
listeria monocytogenes
What are the main viral infectious causes of meningitis?
enteroviruses e.g. coxsackie*
mumps
herpes simplex
what is the difference between bacterial and viral meningitis?
bacterial meningitis is lethal and sudden onset -> need urgent treatment!
viral meningitis is self limiting lasting 4-10 days
What is the classic meningitic syndrome triad?
- headache
- neck stiffness
- fever
How does meningitis present?
headache neck stiffness fever + rigors intense malaise and muscle aches photophobia vomiting kernigs sign - pain and resistance on knee extension
What are the later signs of meningitis?
seizures
decreased consciousness
signs of septicaemic shock
petechial rash - non blanching
What are the signs of meningococcal meningitis?
petechial rash ** - non blanching
fever
headache
neck stiffness
EMERGENCY!!!
How is meningitis diagnosed?
blood cultures and septic screen
lumbar puncture
If a mass lesion is suspected, why can’t you perform a lumbar puncture?
at risk of coning of the cerebellar tonsils
high ICP = no lumbar puncture
do a CT scan first to exclude
What would you expect to see in both a viral and bacterial meningitis CSF sample?
VIRAL
+ lymphocytes, 10-2000 white cell count, colourless, normal glucose and protein
BACTERIAL
+++ polymorphs/neutrophils, 1000-5000 white cell count, turbid colour, low glucose, raised protein, +ve gram statin
How is meningococcal meningitis treated?
slow IV benzylpenicillin - given ASAP + notify public health
How is unknown meningitis treated?
IV cefotaxime = broad spectrum
+ ciprofloxacin to close contacts
Define encephalitis
inflammation of the brain parenchyma caused by a viral infection
Which viruses are likely to cause encephalitis?
herpes simplex enterovirus adenovirus HIV mumps and measles rabies
How does encephalitis commonly present?
- personality and behavioural change
- progressive reduced level of consciousness
- seizures
- fever
How is encephalitis investigated?
- MRI - inflammation, cerebral oedema and swelling
- EEG - periodic sharp and slow wave complexes
- CSF - viral detection, elevated lymphocytes and protein, reduced glucose
How is encephalitis managed?
IV acyclovir - EMERGENCY - for 14-21 days
early treatment reduces mortality
How is trigeminal neuralgia caused primarily and secondarily?
trigeminal neuralgia is caused by compression of the trigeminal nerve root by blood vessels e.g. superior cerebellar (primary)
secondary (15%) causes: aneurysms of intracranial vessels, tumour, MS, trauma, meningeal inflammation (should do MRI and referral to neuro if suspect)
How does trigeminal neuralgia present?
FACIAL PAIN WITH NO OTHER SYMPTOMS
unilateral, sudden, short stabbing, intense, affects mandibular and maxillary divisions of trigeminal nerve, precipitated by light touch, 10/10 pain, can occur up to 100x/day
How is trigeminal neuralgia treated medically?
carbamazepine - 200mg TDS
What is an extradural haemorrhage?
blood collects between the dura mater and bone of skull
How is an extradural haemorrhage usually caused?
there is a traumatic tear in the middle meningeal artery, usually caused by a fracture to the temporal and parietal skull
How does an extradural haemorrhage commonly present?
patient has had head injury with few hours of a lucid period
after the lucid period, patient develops focal signs, deteriorating consciousness, confusion, vomiting, severe headache
How is an extradural haemorrhage diagnosed?
CT HEAD - biconvex/lens shaped haematoma
how is an extradural haemorrhage treated?
urger referral to neurosurgeons for clot evacuation
What is a subdural haemorrhage?
accumulation of blood in the subdural space (between dura mater and arachnoid mater) following rupture of the cortical vein
How does a subdural haemorrhage commonly occur?
caused by trauma to the head in a patient with a shrunken brain e.g. alcoholics, elderly
What is the common history of a patient with a subdural haemorrhage?
- INJURY - minor
- LATENT INTERVAL - days-months
- SYMPTOMS START - fluctuating, drowsiness, headache, confusion, personality change, focal deficits
What is the classic sign of a subdural haemorrhage on the CT?
crescent/ sickle shape
midline shift
How is a subdural haemorrhage managed?
refer to neurosurgeons
irrigation/ evacuation via burr hole to relieve high ICP