Neurology Flashcards
What are risk factors for IHH?
obesity
female sex
pregnancy
drugs
combined oral contraceptive pill
steroids
tetracyclines
retinoids (isotretinoin, tretinoin) / vitamin A
lithium
What are the treatments for IHH?
Weight loss and carbonic anhydrase
What is syringomyelia?
Syringomyelia classically presents with cape-like loss of pain and temperature sensation due to compression of the spinothalamic tract fibres decussating in the anterior white commissure of the spine
What are two causes of pinpoint pupils?
Pontine haemorrhage
Opioid overdose
How is a stroke managed?
ROSIER (recognition of stroke in the emergency room)
FAST survey
Blood glucose check
CT head non contrast
If ischaemic offer thrombolysis within 4.5 hours or thrombectomy 4-6 h
Admit to stroke ward for rehabilitation
How is TIA managed?
When is thrombectomy considered?
Thrombectomy is considered in patients with a confirmed blockage of the proximal anterior circulation or proximal posterior circulation. It may be considered within 24 hours of the symptom onset and alongside IV thrombolysis.
What is given for secondary prevention of stroke?
Clopidogrel 75mg once daily (alternatively aspirin plus dipyridamole)
Atorvastatin 20-80mg (not started immediately – usually delayed at least 48 hours)
Blood pressure and diabetes control
Addressing modifiable risk factors (e.g., smoking, obesity and exercise)
Who is involved in the MDT for stroke?
Stroke physicians
Nurses
Speech and language (SALT) to assess swallowing
Dieticians in those at risk of malnutrition
Physiotherapy
Occupational therapy
Social services
Optometry and ophthalmology
Psychology
Orthotics
What is the ROSIER score?
What is the Oxford Bamford classification?
Homonymous hemianopia
Unilateral
Higher symptoms
What is the features of epidural haematoma?
bi-convex shape and limited by the cranial sutures
Lucid period
Might seem to get better then worse
What are the features of subdural haematoma?
Crescent shape
Slow developing
Bridging veins
Seen in alcoholics and atrophy, older patients
What is the treatment for haemorrhagic stroke?
Immediate imaging (e.g., CT head) is required to establish the diagnosis.
Bloods should include a full blood count (for platelets) and a coagulation screen.
Admission to a specialist stroke centre
Discuss with a specialist neurosurgical centre to consider surgical treatment
Consider intubation, ventilation and intensive care if they have reduced consciousness
Correct any clotting abnormality (e.g., platelet transfusions or vitamin K for warfarin)
Correct severe hypertension but avoid hypotension
What is the guideline for warfarin?
Major bleeding - stop warfarin, vitamin K and PCC
>8 (mild bleeding) IV vitamin K
>8 (no bleeding) oral vitamin k
<5-8 (some bleeding) IV vitamin K
<5-8 (no bleeding) - withhold 1-2 doses and recheck
What are the symptoms of SAH?
Sudden thunderclap occipital headache
Neck stiffness
Photophobia
Vomiting
Neurological symptoms (e.g., visual changes, dysphasia, focal weakness, seizures and reduced consciousness)
What are some associated for SAH?
Family history
Cocaine use
Sickle cell anaemia
Connective tissue disorders (e.g., Marfan syndrome or Ehlers-Danlos syndrome)
Neurofibromatosis
Autosomal dominant polycystic kidney disease
What investigations are done for SAH?
CT
Lumbar puncture
When is a CT less reliable for SAH?
6 hours after symptoms for SAH
When should a lumbar puncture be done for SAH?
12 hours after onset of symptoms to check for xanthochromia
How is SAH managed?
Nimodipine
NORSE
Neurosurgery = coiling
What is key for MS?
A characteristic feature of MS is that lesions vary in location and are “disseminated in time and space”.
How is MS managed?
MDT support
DMT
Steroids for relapses
How is MS investigated?
MRI
Evoked potentials
Lumbar punctures - oligoclonal bands
What are some of the symptoms of MS?
Intranuclear ophthalmoplegia
Marcus Gunn
Lhermitte’s sign
Uthoff sign
Diplopia
Oscillopsia
Nystagmus
What is intranuclear opthalmoplegia?
Internuclear ophthalmoplegia is caused by a lesion in the medial longitudinal fasciculus. The nerve fibres of the medial longitudinal fasciculus connect the cranial nerve nuclei (“internuclear”) that control eye movements (the 3rd, 4th and 6th cranial nerve nuclei). These fibres are responsible for coordinating the eye movements to ensure the eyes move together.
What is the triad of symptoms in Parkinson’s?
Pill rolling tremor
Bradykinesia
Cogwheel rigidity
What is the frequency of tremor in Parkinson’s?
4-6 Hz
What is the frequency of tremor in Essential tremor?
6-12Hz
What are the features of Essential tremor?
Fine tremor (6-12 Hz)
Symmetrical
More prominent with voluntary movement
Worse when tired, stressed or after caffeine
Improved by alcohol
Absent during sleep
How is Essential tremor managed?
Propranolol (a non-selective beta blocker)
Primidone (a barbiturate anti-epileptic medication)
What is complex regional pain?
What is LEMS and how is it normally managed?
Excluding underlying malignancy (e.g., small-cell lung cancer) is essential.
Amifampridine works by blocking voltage-gated potassium channels in the presynaptic membrane, which in turn prolongs the depolarisation of the cell membrane and assists calcium channels in carrying out their action.
Other options include:
Pyridostigmine (cholinesterase inhibitor)
Immunosuppressants (e.g., prednisolone or azathioprine)
IV immunoglobulins
Plasmapheresis
What are the causes of myasthenia gravis?
Anti AchR antibodies
Anti - Muscle-specific kinase (MuSK) antibodies
Anti- Low-density lipoprotein receptor-related protein 4 (LRP4) antibodies
MuSK and LRP4 are important proteins for the creation and organisation of the acetylcholine receptor. Destruction of these proteins leads to inadequate acetylcholine receptors.
What are the features of myasthenia gravis?
The symptoms most affect the proximal muscles of the limbs and small muscles of the head and neck, with:
Difficulty climbing stairs, standing from a seat or raising their hands above their head
Extraocular muscle weakness, causing double vision (diplopia)
Eyelid weakness, causing drooping of the eyelids (ptosis)
Weakness in facial movements
Difficulty with swallowing
Fatigue in the jaw when chewing
Slurred speech
What tests are done for myaesthenia gravis?
Antibody tests look for:
AChR antibodies (around 85%)
MuSK antibodies (less than 10%)
LRP4 antibodies (less than 5%)
A CT or MRI of the thymus gland is used to look for a thymoma.
The edrophonium test can be helpful where there is doubt about the diagnosis.
What would be expected in the endrophonium test?
Relieving the problem temporarily
What does the ice test show for myasthenia gravis?
How is myastenia gravis treated + myasthenic crisis?
ment options include:
Pyridostigmine is a cholinesterase inhibitor that prolongs the action of acetylcholine and improves symptoms
Immunosuppression (e.g., prednisolone or azathioprine) suppresses the production of antibodies
Thymectomy can improve symptoms, even in patients without a thymoma
Rituximab (a monoclonal antibody against B cells) is considered where other treatments fail
Myasthenic Crisis
Myasthenic crisis is a potentially life-threatening complication of myasthenia gravis. It causes an acute worsening of symptoms, often triggered by another illness, such as a respiratory tract infection. Respiratory muscle weakness can lead to respiratory failure. Patients may require non-invasive ventilation or mechanical ventilation.
Treatment is with IV immunoglobulins and plasmapheresis.
What are some features of tuberous sclerosus?
What is the pathophysiology of tuberous sclerosus?
What are the characteristics of neurofibromatosis?
Cafe au lait
Relative affected
Axillary freckles
Bone dysplasia
Iris harmatomas (Lisch nodules)
Neurofibromas
Gliomas
How is neurofibromatosis inherited?
Autosomal dominant
Chromosome 17 Von Recklinhausen
Chromosome 22
How is neurofibromatomas managed?
Bevacizumab antiVEGF
How is MS investigated?
VEPs
MRI brain with diffusion-weighted imaging
Oligoclonal bands
What is a red flag for SAH?
A sudden-onset headache, reaching maximum intensity within 5 minutes, is a red flag requiring further evaluation to exclude a subarachnoid haemorrhage
What is Janz syndrome?
Juvenile myoclonic epilepsy (Janz syndrome)
typical onset is in the teenage years, more common in girls
features:
infrequent generalized seizures, often in morning//following sleep deprivation
daytime absences
sudden, shock-like myoclonic seizure (these may develop before seizures)
treatment: usually good response to sodium valproate
What is a benign rolandic seizure?
Benign rolandic epilepsy
most common in childhood, more common in males
features: paraesthesia (e.g. unilateral face), usually on waking up
What is West Syndrome?
Jack knife or Salaam seizure
Hyparrythmias
Steroids and vigabatrin
What are the features of Normal Pressure Hydrocephalus?
Dementia, incontinence, gait disturbance
What is Weber’s syndrome?
Weber’s syndrome is a form of midbrain stroke characterised by the an ipsilateral CN III palsy and contralateral hemiparesis
How is a TIA managed?
A patient who presents to their GP within 7 days of a clinically suspected TIA should have 300mg aspirin immediately (and be referred for specialist review within 24h)
What is a lacunar stroke?
involves perforating arteries around the internal capsule, thalamus and basal ganglia
pure motor or sensory loss
What is CVST?
What are the symptoms of CSVT?
Common features
headache (may be sudden onset)
nausea & vomiting
reduced consciousness
What investigations are done for CSVT?
Investigation
MRI venography is the gold standard
CT venography is an alternative
non-contrast CT head is normal in around 70% of patients
D-dimer levels may be elevated
What is the management for CVST?
anticoagulation
typically with low molecular weight heparin acutely
warfarin is still generally used for longer term anticoagulation
What are the types of sinus venous thrombosis?
Sagittal sinus thrombosis
may present with seizures and hemiplegia
parasagittal biparietal or bifrontal haemorrhagic infarctions are sometimes seen
‘empty delta sign’ seen on venography
Cavernous sinus thrombosis
other causes of cavernous sinus syndrome: local infection (e.g. sinusitis), neoplasia, trauma
periorbital oedema
ophthalmoplegia: 6th nerve damage typically occurs before 3rd & 4th
trigeminal nerve involvement may lead to hyperaesthesia of upper face and eye pain
central retinal vein thrombosis
Lateral sinus thrombosis
6th and 7th cranial nerve palsies
Why is cyclizine sometimes contraindicated in people with Parkinson’s?
dry mouth, blurred vision and urinary retention. Moreover, Cyclizine may potentially worsen cognitive function i
What are the features of Miller Fisher syndrome?
ophthalmoplegia, areflexia and ataxia.
What type of consciousness is associated with subdural haematoma?
Fluctuating consciousness = subdural haemorrhage
How should a TIA be managed in a patient on DOAC or warfarin?
Admission for a non-contrast CT head, only aspirin and 24 hours if not on medication
What is AICA?
Sudden onset vertigo and vomiting, ipsilateral facial paralysis and deafness - anterior inferior cerebellar artery
What are the complications of meningitis?
sensorineural hearing loss (most common)
seizures
focal neurological deficit
infective
sepsis
intracerebral abscess
pressure
brain herniation
hydrocephalus
How is paroxysmal hemicrania managed?
Paroxysmal hemicrania is completely responsive to treatment with indomethacin
What is paroxsymal hemicrania?
Paroxysmal hemicrania (PH) is defined by attacks of severe, unilateral headache, usually in the orbital, supraorbital or temporal region. These attacks are often associated with autonomic features, usually last less than 30 minutes and can occur multiple times a day.
PH sits within the group of disorders called trigeminal autonomic cephalgias which also contains cluster headache, a condition which shares many features with PH.
Importantly, PH is completely responsive to treatment with indomethacin.
What is given if a patient cannot tolerate clopidogrel as second line?
If clopidogrel is contraindicated or not tolerated, given aspirin and modified release dipyramidole for secondary prevention following stroke
What are the features of Shy Drager syndrome?
Shy-Drager syndrome is a type of multiple system atrophy.
Features
parkinsonism
autonomic disturbance
erectile dysfunction: often an early feature
postural hypotension
atonic bladder
cerebellar signs
What is foot drop associated with?
‘Foot drop’ - ?common peroneal nerve lesion
What is a surgical cranial nerve III palsy linked to?
Painful third nerve palsy = posterior communicating artery aneurysm