Neurology Flashcards
What is Multiple Sclerosis?
An inflammatory demyelinating disorder of the CNS characterised by plaques disseminated in time and space
What mediates the demyelination in MS?
T cells
How does pyramidal dysfunction in MS present?
Increased tone, spasticity, weakness
Where is the weakness in MS?
Extensors of upper limbs, flexors of lower limbs
What sensory symptoms may be present in MS?
Pins & needles/numbness
Pain
Trigeminal neuralgia
What is Lhermitte’s syndrome?
Paraesthesia of the limbs on neck flexion
What cerebellar symptoms may be present in MS?
Ataxia, intention tremor, nystagmus, past pointing, pendular reflexes, dysdiadochokinesia, dysarthria
What visual symptoms may be present in MS?
Optic neuritis, optic atrophy, internuclear ophthalmoplegia, Uhtoffs phenomenon
What is Uhtoff’s phenomenon?
Worsening of vision due to increased body temperature
What other symptoms may be present in MS?
Fatigue, urinary incontinence, sexual dysfunction, intellectual deterioration
What are the types of MS?
Relapsing remitting
Relapsing progressive
Primary progressive
Secondary Progressive
What is the commonest type of MS?
Relapsing remitting
What investigations should be done if you suspect MS?
Bloods (FBC, PV, CRP, autoantibodies, B12, folate - all negative)
MRI
CSF
What does an MRI in MS show?
T2 weighted MRI shows plaques disseminated in time and space
What does electrophoresis of CSF show in MS?
Oligoclonal bands of IgG
What does neurophysiology show in MS?
Delayed evoked potentials
What criteria is used to diagnose MS?
McDonald Criteria
How should an acute exacerbation of MS be treated?
Methylprednisolone (oral or IV)
What are some first line disease modifying therapies for MS?
Beta-interferon
Copaxone
Tecfidera
How is fatigue managed in MS?
Amantadine
How is spasticity managed in MS?
Baclofen/gabapentin
How is oscillopsia managed in MS?
Gabapentin/memantine
How is emotional lability managed in MS?
Amitriptyline
What is motor neurone disease?
An untreatable and rapidly progressive neurodegenerative condition characterised by selective loss of motor neurones
What symptoms do you get in MND?
UMN and LMN signs
No sensory loss, no sphincter disturbance, no eye movements affected
What is the commonest type of MND?
Amyotrophic lateral scleorsis
What nerves do pseudobulbar palsy/bulbar palsy affect?
CN IX-XII
What investigations should be done for MND?
MRI (normal)
Nerve conduction studies (normal)
EMG
What does EMG show in MND?
Fasciculations and fibrillations
What drug prolongs life in MND and for how long?
Riluzole - anitglutaminergic drug prolongs life by 3 months
What drugs can be used for symptomatic relief in MND?
Quinine/baclofen for cramps
Baclofen/gabapentin for spasticity
Propantheline/botox for drooling
Supplements/gastronomy for nutrition
What does curare poisoning cause?
Blockage of acetylcholine receptors at NMJ leading to no muscle contraction (can mean no respiration)
What is botulism?
Caused by botilinum toxin, which blocks release of acetylcholine, causing flaccid paralysis
What is Lambert-Eaton Myaesthenic syndrome?
Antibodies against pre-synaptic calcium channels
What is LEMS associated with?
Small cell lung cancer
What are the symptoms of LEMS?
Weakness of limbs (improves with exercise), autonomic involvement, hyporeflexia
What investigations would you do for LEMS?
Bloods (increased autoantibodies)
EMG (shows improvement of potentials after use)
How is LEMS treated?
TREAT UNDERLYING CANCER. Steroids, azaithioprine, pyridostigmine, immunoglobulins
What is Myaesthenia Gravis?
Autoimmune condition against post-synaptic acetylcholine receptors
Who commonly gets Myaesthenia Gravis?
Commonly females in 3rd decade of life or Males in 6th/7th decade
What are symptoms of Myaesthenia Gravis?
Muscular fatigue, eye signs (e.g. ptosis, diplopia), gets worse throughout day. Voice deterioration as they speak.
What can exacerbate symptoms of Myaesthenia Gravis?
Pregnancy, change of climate, emotion, exercise, certain medications
What investigations can be done for Myaesthenia Gravis?
Bloods (autoantibodies)
Tensilon test
Neurophysiology (decreased response to nerve stimulation over time)
How is Myaesthenia Gravis treated?
Pyridostigmine for symptom control
Steroids/azaithioprine/methotrexate for immunosuppression
Thymectomy may be needed if disease not well controlled by anticholinesterases
What is Myaesthenic crisis?
Weakness of respiratory muscles during a relapse which can be life threatening
How is a myaesthenic crisis treated?
Plasmapheresis or IV Immunoglobulins
What makes up the triad of meningism?
Fever, headache and neck stiffness
What are the key symptoms of meningitis?
Meningism, photophobia, confusion, agitation, seizure, non-blanching purpuric rash
What is Kernig’s sign?
Pain and resistance on passive extension of the knee with flexed hip
What are some viral causes of meningitis?
ECHO virus, coxsackie virus, herpes simplex
What are the common bacterial causes of meningitis in neonates?
Listeria, Group B strep, E coli
What is the commonest bacterial cause of meningitis in children?
Haemophilus influenzae
What is the commonest bacterial cause of meningitis in those aged 10-21?
Neisseria Meningitidis
What are the common bacterial causes of meningitis in those over 21?
Strep pneumoniae and neisseria meningitidis
What are the common bacterial causes of meningitis in the elderly?
Strep pneumoniae, Listeria
What is aseptic meningitis?
Inflammation of the meninges with no pus
What are some causes of an aseptic meningitis?
TB, HIV, syphilis, vasculitis, drug induced
What investigations should you consider in someone with suspected meningitis?
Bloods (FBC, U&Es, coag screen, glucose, cultures), throat swab, CXR if suspect TB, LP is diagnostic
When is a lumbar puncture contraindicated?
Immunocompromised
Papilloedema
Focal neurological signs
On LP, which organisms show neutrophilia?
Bacterial
On LP, which organisms show lymphocytes?
Viral and TB
What are protein and glucose like in viral meningitis?
Normal
What are protein and glucose like in bacterial meningitis?
High protein, low glucose
What is the empirical antibiotic treatment for bacterial meningitis?
IV ceftriaxone 2g BD + Dexamethasone 10mg IV QDS
What antibiotic should be added if you suspect listeria as a cause of bacterial meningitis?
Amoxicillin IV 2g 4hrly (Chloramphenicol if allergic)
Who should be contacted if there is a case of bacterial meningitis?
Public Health
What is the contact prophylaxis for bacterial meningitis?
500mg ciprofloxacin orally
What is encephalitis?
Inflammation of the brain parenchyma
What are the common causes of encephalitis?
Herpes simplex, varicella zoster, CMV/HIV
How does encephalitis present?
Similar to meningitis but may also be odd behaviours or aphasia (if temporal lobe affected)
What investigations should be done for encephalitis?
LP - CSF shows lymphocytosis. Do PCR for HSV
MRI - may show ‘temporal lobe enhancement’
What is temporal lobe enhancement on MRI a sign of?
Herpes Simplex Encephalitis
How is Herpes Simplex Encephalitis treated?
IV Aciclovir
How does a brain abscess present?
Raised ICP, focal neurological signs, fever
How is a brain abscess diagnosed?
CT head
How is a brain abscess treated?
Surgically - crainiotomy and debridement
What is progressive multifocal leukoencephalopathy caused by?
JC virus which causes widespread demyelination
What are some risk factors for PML?
Immunosuppression, autoimmune disease, MS drugs
How is PML investigated?
LP shows JC virus DNA
MRI shows focal white matter lesions
What is Parkinsons disease?
Progressive neurodegenerative condition caused by degeneration of dopaminergic neurons in the substantia nigra
What is the biggest risk factor for Parkinson’s Disease?
Age
What are the 3 main motor symptoms of Parkinson’s Disease (Parkinsonism)?
Bradykinesia
Tremor
Rigidity
How does bradykinesia present in Parkinsons?
Slowness of movement with progressive loss of amplitude, decreased facial expression (mask like expression), soft speech, micrographia, shuffling gait, decreased arm swing
What is the tremor like in Parkinsons?
4-7hZ pill rolling resting tremor, worse when stressed/tired. Usually disappears when doing something
How does the rigidity present in Parkinsons?
Increased tone
What is cogwheel rigidity?
Felt at the wrist, the result of the tremor imposed on hypertonia
What are some non-motor symptoms of Parkinsons?
Anosmia, visual hallucinations, REM sleep disorder, depression, drooling, constipation
What is the first line treatment for Parkinsons if QOL is severely affected by motor symptoms?
Levodopa
What is the first line treatment for Parkinsons if QOL not severely affected by motor symptoms?
Dopamine agonist, levodopa or MAO-B inhibitor
What is a risk if a medication is missed in Parkinsons disease?
Neuroleptic Malignant Syndrome
How does neuroleptic malignant syndrome present?
Pyrexia, rigidity, tachycardia, increased CK, leucocytosis
How is neuroleptic malignant syndrome treated?
IV fluids and dantrolene
What are some side effects of levodopa?
Nausea and vomiting, dyskinesia, sudden off days, psychosis
What is an example of a dopamine agonist?
Ropinorole (non-ergo_
Bromocriptine (ergo)
What are some side effects of dopamine agonists?
Daytime somnomelence, impulse disorders, pulmonary fibrosis
What is an example of an MAO-B inhibitor and how does it work?
Selegiline - inhibits dopamine breakdown
What is an example of a COMT inhibitor and when is it used?
Entacapone. Used in conjunction with levodopa to increase its effect (e.g. synimet)
How is psychosis treated in Parkinsons?
Quetiapine
How is an REM sleep disorder in Parkinsons treated?
Clonazepam/Melatonin
What is the presentation of essential tremor?
Symmetrical, postural tremor with a higher frequency than PD. Intensifies with use. Autosomal dominant
How does Multiple System Atrophy present?
Jerky, postural tremor, cerebellar signs, parkinsonism, pyramidal signs, urinary retention/incontinence, postural hypotension, impotence
How is MSA differed from PD?
Autonomic involvement
‘MRI shows hot cross bin sign’
MSA - due to cerebellar and pontine atrophy
How does progressive supranuclear palsy present?
Parkinsonism plus psuedobulbar palsy, neck dystonia, supranuclear ophthalmoplegia, gait and balance issues
How does corticobasal degeneration present?
Rigidity and weakness of one limb, apraxia, loss of powerful movement, sensory disturbance
What is fragile X tremor ataxia syndrome and how does it present?
Late onset neurodegenerative disorder. Causes cerebellar ataxia, postural/intention tremor, dysautonomia and cognitive decline
What drugs may cause parkinsonism?
Antipsychotics, prochloperazine, metoclopramide, methyldopa
What is Wilson’s disease?
Autosomal recessive disease of copper accumulation in liver and CNS
What neurological symptoms does Wilsons disease cause?
Psychiatric issues, decreased IQ, decreased memory, tremor, akinesia, ataxia, movement disorders
What is epilepsy?
Common neurological condition characterised by recurrent seizures
What conditions are associated with epilepsy?
Cerebral palsy, tuberous sclerosis, mitochondrial diseases
What are the two classifications of epilepsy onset?
Focal
Generalised
Where does a focal seizure occur in the brain?
Starts in an area on one side of the brain (can spread though)
Where does a generalised seizure occur in the brain?
Both sides of the brain at onset
What can focal seizures further be classified by?
Awareness retained or impaired
What motor symptoms may be seen in focal seizures?
Jerking, twitching, stiffening etc
What non-motor symptoms may be seen in focal seizures?
Changes in sensation, emotions, smells, thinking, experiences
What motor symptoms may be seen in generalised seizures?
Tonic-clonic, myoclonic etc
What non-motor symptoms may be seen in generalised seizures?
Absence seizures - staring, changes in awareness, lip smacking
What may patients experience following a seizure?
Post-ictal phase - flaccid, unresponsiveness, drowsiness, headache
What investigations should be done following a patients first seizure?
ECG, EEG, MRI
When is drug treatment for epilepsy introduced?
After the patients second seizure
What is the first line treatment for generalised seizures?
Sodium valproate
What is the first line treatment for focal seizures?
Carbemazepine or lamotrigine
What is the other drug option for absence seizures?
Ethosuximide
How does sodium valproate work?
Increases GABA activity
What are side effects of sodium valproate?
Weight gain, alopecia, ataxia, tremor, hepatitis, teratogenicity, p450 inhibitor
How does carbamazepine work?
Binds to sodium channels
What are side effects of carbamazepine?
p450 enzyme inducer, dizziness, drowsiness, agranulocytosis, diplopia, SIADH
How does lamotrigine work?
Sodium channel blocker
What are side effects of lamotrigine?
Steven-Johnson-Syndrome
What are side effects of phenytoin?
P450 enzyme inducer, facial coursening, anaemia, neuropathy
What medication should be used in the community for status epilepticus? (>5mins)
Buccal midazolam or rectal diazepam
What medication should be used in hospital for status epilepticus?
IV lorazepam repeated if necessary
IV phenobarbitol/phenytoin if ongoing
How long are you not allowed to drive for after first seizure?
Car - 6 months
HGV - 5 years
How long are you not allowed to drive for once you have a diagnosis of epilepsy?
Car - 5 years
HGV - 10 years
What should be done in patients who are wanting to concieve with epilepsy?
Swap from valproate to lamotrigine
5mg folic acid from trying to concieve until 12 weeks
What are red flag symptoms in headache?
New onset aged over 55 Known/previous malignancies Immunosuppression Early morning headache Exacerbation by coughing (raised ICP)
What is a migraine caused by?
Neural and vascular influences cause changes in the brain, activating trigeminovascular dilatation. Chemicals released irritate blood vessels and nerves causing pain
What are the features of migraine without aura?
Unilateral, pulsatile, moderate/severe pain, nausea, vomiting, photophobia, phonophobia
Need 5 separate attacks of duration 4-72hrs
What are features of migraine with aura?
Recurrent attacks lasting minutes of unilateral fully reversible visual, sensory or other CNS symptoms then headache
What can trigger migraines?
Stress, sleep (too much or too little), trauma, sensory stimulation, certain foods, exercise, heat, dehydration
What is non-pharmacological management of migraine?
Avoid triggers, stress techniques, accupuncture
What is the acute management of migraine?
Simple analgesia first (aspirin/ibuprofen), triptan +/- antiemetic
When is prophylactic treatment for migraine considered?
If more than 3 attacks per month/severe
What is the prophylactic treatment of migraine?
Propranolol, amitriptyline
2nd line - topiramate
Who is cluster headache common in?
Young men, smokers
How does a cluster headache present?
Severe, unilateral headache, bloodshot red eyes, rhinorrhoea, lid swelling, lacrimation
How often and for how long to cluster headaches occur?
30mins-3hrs, 1-8 times a day
How are cluster headaches managed acutely?
Oxygen for 15-20 mins and subcut sumitriptan
What is given prophylactically for cluster headaches?
Verapamil
How does paroxysmal hemicrania present?
In elderly women. Unilateral headache and autonomic features
How often and for how long does paroxysmal hemicrania occur?
Lasts 2-45mins , 1-40 times a day
How is paroxysmal hemicrania treated?
Absolute response to indomethacin
What is a SUNCT?
Short lived (15-120s), unilateral, neuralgiform headache with conjunctival injections and tearing
How is SUNCT treated?
Lamotrigine, gabapentin
How does trigeminal neuralgia present?
Severe stabbing unilateral pain in V2/3 triggered by touch
How long and how often does trigemnial neuralgia occur?
1-90 seconds 10-100times a day
How is trigeminal neuralgia managed?
Carbemazepine
How does a tension headache present?
Recurrent, non-disabling, bilateral headache, described as a tight band, non pulsatile
How is a tension headache managed?
stress relief
What are features of a medication overuse headache?
Present for 15+ days of the month, developed or worsened by medication, psychiatric comorbidity common
How is medication overuse headache managed?
Remove cause, advise patients to take OTC pain relief no more than 6 days a month
How does temporal arteritis present?
Rapid onset unilateral headache, jaw claudication, tender, palpable pulseless temporal artery. Raised ESR
How is temporal arteritis managed?
Steroids
What is a stroke?
Acute onset focal neurology due to a disruption of blood supply to the brain
What are the two main types of stroke?
Ischaemic and haemorrhagic
What are risk factors for stroke?
Age, hypertension, smoking, hyperlipidaemia, DM, atrial fibrillation
What which type of stroke is more common?
Ischaemic (85%)
What are the two causes of ischaemic strokes?
Thrombotic and embolic
If symptoms of stroke last less than 24hrs what is it defined as?
TIA
What are the symptoms of a TACS?
Hemiparesis+/- hemisensory loss AND
homonymous hemianopia AND
higher cognitive dysfunction
What arteries does a TACS affect?
Anterior circulation - middle and anterior cerebral
What are symptoms of a PACS?
2 from
Hemiparesis +/- hemisensory loss
homonymous hemianopia
higher cognitive dysfunction
What arteries does a PACS affect?
Middle/anterior cerebral arteries
What are symptoms of a LACS?
One from
Hemiparesis
Purely sensory loss
Ataxic hemiparesis
What arteries does LACS affect?
Perforating arteries (e.g. thalamus, basal ganglia etc)
What are symptoms of POCS?
One from
Cerebellar/brainstem syndromes
LOC
Isolated homonymous hemianopia
What symptoms does lateral medullary syndrome cause?
Ipsilateral ataxia, nystagmus, nerve palsies
Contralateral limb sensory loss
What symptoms does Webers syndrome cause?
Ipsilateral CNIII palsy
Contralateral weakness
What does a basilar artery stroke cause?
Locked in syndrome
What score is used to assess stroke?
Rosier
What score is used to assess TIAs?
ABCD2
What is the initial investigation of stroke?
CT head to rule in/out haemorrhagic stroke
What other investigations should be done in suspected stroke?
Bloods (FBC, glucose, U&Es, LFTs, coag, lipids)
ECG, echo
Carotid doppler
What is the initial management of ischaemic stroke?
Thrombolysis - Alteplase
What is the time frame for thrombolysis?
4.5hrs
What antiplatelet should initially be started for ischaemic stroke and for how long?
Aspirin 300mg for 14 days
How is haemorrhagic stroke managed?
Clot evacuation, treat underlying cause, stop anticoagulants
What are the post-stroke preventative medications?
Clopidogrel 75mg lifelong
Statin lifelong
ACEi/ARB + diuretic to control blood pressure
If a stroke patient is found to have AF, what should they be put on and with what target?
Warfarin with target INR 2-3
What are some common stroke mimics?
Hypoglycaemia, migraine, SOL, post-ictal, demyelination, intracranial haemorrhage, functional
Where does a subarachoid haemorrhage occur?
Bleed in circle of willis with blood accumulating in the subarachnoid space
What are causes of SAH?
AVM, ruptured berry aneurysm (EDS, PCKD)
How does SAH present?
Thunderclap headache, collapse, LOC, meningism, focal neurology
What does CT show in SAH?
Grey areas with dark ventricles
If the CT is negative in suspected SAH what should you do?
LP
How is SAH managed?
Fluids, nimodipine to prevent vasospasm, endovascular clipping/coiling of artery
What vessels cause and where does a subdural haemorrhage occur?
Bridging vessels
Between dura and arachnoid
What are risk factors for subdural haemorrhage?
Increased age, alcoholics, epilepsy, anti-coagulants
What is the cause of a subdural?
Trauma or commonly unable to recall an incident of trauma
What is the presentation of a subdural haemorrhage?
Fluctuating consciousness, mental slowing, sleepiness, dull headache, focal neurology
What does a subdural look like on CT?
Creset shaped haematoma
How is a subdural haemorrhage treated?
Burr hole craniotomy
What vessels and where does an extradural haemorrhage occur?
Middle meningeal artery, blood accumulates between the bone and the dura
What are causes of extradural haemorrhage?
Temporal bone fracture, history of head injury
How does extradural haemorrhage present?
Head injury then lucid period. Increasing headache and then sudden decline in conscioussness, confusion, seizures, vomiting, hemiparesis, focal neurology
What does a CT head show in extradural haemorrhage?
Biconvex haematoma (rugby ball shaped)
How is an extradural haematoma managed?
Clot evacuation and ligation of middle meningeal artery
What are common side effects of triptans?
Tightness of chest, feeling of heaviness, pressure
What diet may be helpful in epilepsy?
Ketogenic diet
What is the commonest psychiatric problem in PD?
Depression
What is cataplexy?
Sudden and transient loss of muscle tone in response to emotion
What is the classic triad of Wernickes encephalopathy?
Nystagmus, ataxia and confusion
What is the triad of normal pressure hydrocephalus?
Ataxia, urinary incontinence, dementia
Obese young female with headache and blurred vision
Idiopathic intracranial hypertension
What are features of syringomelia?
Wasting and weakness of arms
Loss of pain and temperature sensation
Loss of reflexes, upgoing plantars
How does degenerative cervical myelopathy present?
Loss of fine motor function of upper and lower limbs
‘Unilateral tinnitus and deafness’
Acoustic neuroma
How is cervical myelopathy investigated?
MRI
What drug is used to manage Bells palsy?
Prednisolone
What is chronic inflammatory demyelinating polyneuropathy?
Antibody mediated demyelination of peripheral nerves
What is the commonest long term complication of meningitis?
Sensorineural hearing loss