Neuro Flashcards
causes of blackout
syncope [decreased cerebral perfusion]
epilepsy
non-epileptic attacks
what is described: a drop in blood pressure, quickly followed by faster then slower heart rate resulting in poor blood and oxygen flow to the brain which results in temporary loss of consciousness
vaso-vagal /neurocardiogenic syncope
epilepsy - definition and cause
tendency to recurrent seizures
disordered electrical activity in the brain
triggers for syncope
stress, fear, standing, heat, micturition, cough, venepuncture
triggers for epileptic seizure
sleep deprivation flashing lights menstruation alcohol withdrawal
syncope prodrome vs epilepsy
syncope: hot, vision loss, dizzy, pale
epilepsy: aura [visual, auditory, gustatory]
time difference between syncope, non-epileptic seizures and epileptic attack
syncope seconds>mins
epilepsy 2>3 mins
N.E.A.s >30mins
phases of generalized tonic clonic seizure
tonic phase - rigid
clonic - muscles jerk rhythmically
post-ictal - drowsiness
incontinence and tongue biting in syncope and epilepsy
rare in syncope
yes in epilepsy
Ix for blackout
echo 24 hr ECG CT - rule out tumour lying and standing BP, table tilt EEG
eyes and mouth open or closed in tonic clonic vs non-epileptic seizure
tonic clonic- open
non-ep - closed
eyes roll up slightly and eyelids flicker. Type of seizure?
absence
best investigation for diagnosing MS
MRI brain
relapsing and remitting optic neuritis, neurological deficits of cranial nerves and limbs over several years followed by secondary progressive neurological problems. Diagnosis?
MS
MS patient with worsening mobility, long term catheter, pyrexia, chest clear. Most appropriate investigation to find cause of current state?
MSU
oligoclonal bands in the CSF = ?
MS
neuro features of sarcoidosis
bells palsy neuropathy meningitis brainstem and spinal syndromes space occ lesion
18 yr old. Sudden onset, back pain, numbness, diff walking, proximal thigh weakness, glove and stocking loss of sensation, loss of reflexes. Diagnosis
Guillain-Barre syndrome
relapsing remitting MS usual age of onsset
15-25
oxybutynin treats
urge incont
obesity, morning headaches, enlarged blind spots
raised intracranial pressure probably due to idiopathic intracranial HTN
quick assessment of cognitive state
AMTS
neurological side effect of TB drug isoniazid
peripheral neuropathy
what deficiency is wernicke korsakoff’s due to
thiamine
causes of papilloedema
tumour
hydrocephalus
cavernous sinus thrombosis, meningitis
idiopathic intracranial HTN
causes of Homonymous hemianopia
stroke, tumour
cause of Bitemporal hemianopia-
optic chiasm compression e.g. pituitary tumour
3rd nerve palsy signs
ptosis, large pupil, eye down and out
nystagmus is due to lesions where
cerbellum, vestibular
headache history Red flags?
New headache >60yrs
thunderclap
infective sx
hx of malignancy
is proximal/distal weakness caused by a muscle/nerve problem?
proximal weakness is muscular
distal weakness is nerve
is peripheral neuropathy sensory or motor
Sensory or motor or both
symptoms of GBS
parasthesia, weakness, paralysis, numbness, areflexia, balance/coord probs
GBS Tx
IVIG
mechanism of GBS
complement activation
demyelination by WBCs
/trigger [infection] causes antibodies which attack nerves
name some conditions which can lead to Mononeuritis Multiplex
Vasculitis RA DM SLE sarcoid
give an examples of a mononeuropathy
carpal tunnel syndrome
describe distribution of mononeuropathy, mononeuritis multiplex and polyneuropathy
mononeuropthy: one nerve
MM: random individual nerves
polyneuropathy: glove and stocking
Ix of neuropathy
FBC ESR glucose B12 coeliac TFT U and E
non-neurological causes of peripheral neuropathy
hypothyroidism coeliac B12 deficiency chronic kidney disease diabetes
what part of the nervous system is affected by myasthenia gravis and how?
neuromuscular jn
autoimmune antibodies bind ACh receptors on post-synaptic membrane
what is the main symptom of MG?
fatigue-able muscle weakness
MG worse in morning or evening?
evening
what eye symptoms might MG patients experience?
diplopia
ptosis
describe link between MG and cancer
MG can occur as a PARANEOPLASTIC syndrome in thymoma or bronchogenic carcinoma. Cancer produces the autoimmune antibodies
what is a myasthenic crisis?
life threatening manifestation of MG e.g. resp muscles affected
Tx for MG
acetylcholinesterase inhib [pyridostigmine]
prednisolone/ [azathoprine] for relapse
thymectomy
IVIG for myasthenic crisis
Ix for MG
CT thorax
ACh receptor antibodies
EMG
tensilon test [rarely]
causes of myasthenic crisis
Infection
natural disease cycle
under/over dosing of medication
what drugs can cause myopathy?
steroids
statins
investigations in myopathy
CK EMG CRP genetics for Duchennes/Becker biopsy
acute and chronic Tx for migraine
acute - NSAIDs, triptans
chronic - BB, amitryptiline
describe cluster headache and some Sx
get a number of headaches over a short period, then may have none for yrs.
red painful eye, rhinorhoea
Tx of cluster headaches
O2, triptans
treatment of trigeminal neuralgia
carbamazepine
what Ix in patient with trigem neuralgia and why?
MRI for tumour
ix for GCA
temporal artery biopsy
ESR
complication of GCA
blindness
what scoring system estimates risk of stroke after TIA
ABCD2 Age >60 BP >140/90 Clinical - 1=speech 2=unilat weakness Duration - 1= 10-60, 2= >60mins DM
treatment for TIA
aspirin [clopidogrel as alternative intolerant]
+ secondary prevention
acute Mx of ischaemic stroke
CT
TPA [tissue plasminogen activator] [alteplase]
then aspirin 24 hrs later
or aspirin alone asap if no TPA
how does an extradural haemorrhage appear on CT
elliptical, doesnt follow lobe shape
how does extradural haemorrhage present
loss of consciousness after trauma
then lucid phase
then rapid deterioration in GCS
headache dizzy vomiting
causes of extradural heamorrhage
skull fracture [parietal bone]
middle meningeal artery rupture
Ix for extradural haemorrhage
CT to look at bleed
xray to look for fracture
cause of subdural haemorrhage
ruptured bridging veins, falls
people at risk of subdural haemorrhage
elderly, alcoholics, epileptics, bleeding disorders
Sx of subdural
confusion, headache
Mx subdural
conservative, improves by self. Surgery in severe
Mx extradural haem
surgery
cause of SAH
berry aneurysm
where are berry aneurysms
aneurysms at branch points in the circle of willis
associations/ risk factors for berry aneurysms
PKD
HTN
ehlers danlos
coarc aorta
symptoms of SAH
thunderclap headache
can get meningism - neck stiffness
Ix SAH
CT, LP after 12 hrs
what drug do you give to SAH patients before surgery
oral nimodipine
what would you see on an LP 12 hrs after SAH
yellow csf, xanthachromia
diff between simple and complex partial seizures
complex - altered consciousness
treatment for absence seizures and one treatment you should never use and why
valproate or ethosuximide
never use carbamaz - makes worse
after how many seizures do you start treating someone for epilepsy
2
MS presentations and how/when do they happen
optic neuritis, trigem neur, numbness
dissemminated in time and spacce
parkinsons triad of Sx
and 3 other Sx
bradykinesia
cogwheel rigidity
resting tremor
[depression dementia shuffling gait sleep disturbance hypokinesia postural instability bladder + bowel dysfn speech + lang probs weight loss swallowing probs]
parkinsons pathophysiology
Degeneration of dopamine neurons in substantia nigra of basal ganglia
Tx for parkinsons
levodopa (with co-careldopa [carbidopa] or co-beneldopa)
non-ergot-derived dopamine-receptor agonists [ropinirole]
MAOIs [selegiline]
COMT inhibitors [entacapone] with levodopa
if not controlled: ergot-derived [bromocriptine]
still not controlled: amantadine
name some parkinsons plus syndromes and what added systems affected /symptoms
lewy body dementia
progressive supranuclear palsy [EYES]
multiple system atrophy [POST HYPO]
define parkinson’s plus syndromes
classical features of PD plus other additional features that dintinguish them from simple parkinsons
what inheritance pattern is huntingdons and therefore how likely is child to get it
auto dom, 50%
pathophys of huntingdons
& associated gene defect
atrophy of striatum [part of basal ganglia] + cortex
CAG repeat in gene that codes for huntingtin protein on chr4
symptoms of huntingdons
chorea [extra movements]
depression, dementia, personality change,
cognitive impairment, psychiatric illness
average age of huntingdon onset
40
causes of death in huntingdons patients
aspiration pneumonia
suicide
Ix for huntingdons
genetic test
Mx of huntingdons
tetrabenazine [dopamine-depleting]
olanzapine [dopamine receptor antagonists]
OT/physio
antidepressants/mood stabilisers
main features of MND
muscle wekaness, wasting, increased or decreased reflexes depending on UMN/LMN affected, fasciculations
what symptoms are never present in MND
sensory, eye, cerebellum
GBS Ix
CSF [high protein]
nerve conduction study [features of demyelination]
Mx of GBS
IVIG
GCS - scores for verbal response
- orientated in time/place/person
- confused
- inappropriate words
- incomprehensible sounds
- none
GCS scores for eye response
- spontaneously
- to speech
- to pain
- none
GCS score for motor response
- obeys commands
- localises
- normal flexion
- abnormal flexion
- extension
- none
3rd nerve palsy does what to pupil?
fixed dilated
are the following likely to be of spine or brain origin?
- Radiating limb pain
- Bilateral limb deficit
- Contralateral deficit
- radiating limb pain - spine
- Bilateral limb deficit - spine
- Contralateral deficit - brain
C6 nerve root resonsible for which arm action and reflex
elbow flexion
biceps reflex
C7 nerve root responsible for which arm action and which reflex
elbow extension
triceps
nerve root responsible for dorsi and plantar flexion of the foot
dorsiflexion [standing on heels] - L4, L5
plantar flexion [tip toes] - S1, S2
corticospinal motor tract decussates at what level ?
medulla
spinothalamic sensory tract decussates where?
spinal cord
posterior column sensory tract decussates where?
medulla
what is brown sequard syndrome
weakness on one side
sensory loss on other
due to damage to one side of spinal cord
cerebellar lesion. Deficit on same or ipsilateral side?
same side
cerebellar symtoms
ataxia
nystagmus
intention tremor
slurred speech
symptoms of raised intracranial pressure
headache, vomiting, visual disturbance, gait unsteadiness
signs of raised intracranial pressure on examination of the eyes
papilloedema, limitation of upward gaze, reduced visual acuity
timeframe for TIA
less than 24 hrs
63 year old HGV driver. Stopped to take a break and has word finding problems. Rt arm felt ‘heavy’. Improved after 15 minutes. Diagnosis?
TIA
what factors would constitute a high risk TIA?
ABCD score ≥4
> 1 TIA in last 7 days (Crescendo TIAs)
New arrhythmia
Known high grade ipsilateral carotid stenosis
immediate management for high risk TIA
Aspirin (300 mg daily) start immediately for 2 weeks
what investigations might you want to carry out in a patient who has just had a high risk TIA?
MRI
Carotid dopplers- to look for significant stenosis of internal carotid artery
24 Hour ECG
causes of haemorrhage
HTN Trauma Anticoagulation Tumour AVM
management of confirmed cerebral haemorrhage
surgery
Investigation to look for cause of confirmed brain haemorrhage
MRI - space occupying lesion or arteriovenous malformation
what is todd’s paresis
post ictal weakness
23 year old woman Blurring of vision R eye, Gradual numbness affecting left hand and lip. Headache O/E- Normal Diagnosis?
migraine
stroke bloods
FBC, ESR, clotting, U & E, LFT’s, glucose, cholesterol
stroke patient with raised ESR. What other Ix might you consider and why?
blood cultures [endocarditis]
temporal artery biopsy [vasculitis]
risk of tPA thrombolysis in stroke
fatal haemorrhage
contraindications for tPA
>4.5 hrs after symptom onset peptic ulcer surgery/trauma in last 3 months haemorrhagic stroke on heparin BP >185/110
in what situations might you treat HTN immediately in stroke patient
HTN encephalopathy HTN nephropathy pre-eclampsia haemorrhage aortic dissection MI thrombolysis candidates
what is the policy on feeding for stroke patients?
all stroke patients must remain nil by mouth until theyve had dysphagia screen
IV nutrition
>24 hrs - NG
>7 days - PEG
what are ventriculo-peritoneal shunts used for in stroke patients
for primary intracranial haemorrhage with hydrocephalus
3 options for ANTIPLATELETS in secondary STROKE prevention
clopidogrel, aspirin, dipyridamole
what is the most common ‘anterior horn cell disease’
MND
list some long tract (UMN) signs
Spastic gait Hypertonia Hyper-reflexia Babinski Clonus Hoffman’s
common causes of coma
meningitis/encephalitis head injury bleed/SAH opiates/alcohol anoxia post MI epilepsy hypo
adverse complications of Amphetamine + other stimulants
intracranial haemorrhage ischaemic stroke seizures psychosis/delirium coma
define wernickes encephalopathy and give some Sx
neuro consequences of thiamine deficiency due to alcohol abuse.
ataxia, confusion, opthalmoparesis
define korsakoffs and give some Sx
permanent neuro damage due to alcohol abuse (thiamine def) follows wernickes encephalopathy.
Ataxia, confusion, abnormal eye movements
what cranial nerve palsy is seen in SAH
3rd nerve
triad of horners syndrome and cause
constricted pupil ptosis anhidrosis ON ONE SIDE OF FACE damage to sympathetic nerve supple to eye
59-year-old developed acute bilateral flaccid leg weakness.
Had shifted her weight while sitting on the sofa and suddenly felt sharp pain in lower back + R leg.
Legs numb, over 1 hr because unable to move them.
Couldn’t urinate + dribbling incontinence.
Differentials?
cauda equina /lower spinal cord lesion (myelopathy)
numbness makes muscular or NMJ unlikely
(sudden onset suggests vascular or compression)
Causes of acute/subacute myelopathy
trauma malignancy (compression) infection disc inflamm (MS/transverse myelitis) vascular
72 yr old with back pain and progressive lower limb weakness, sensory loss and bladder dysfn.
MRI - vertebral destruction and cord compression.
CXR - lung mass.
Dx?
lung malignancy spinal mets
18 yr old male flu-like illness Tingling feet and hands then slurred speech, facial weakness, limb weakness progressive over days O/E hyporeflexic, weakness Diagnosis?
GBS
warning signs after head injury
change in consciousness pupils unequal or slow to react seizures vomiting blurred vision loss of sensation slurred speech blood/watery from nose/ears
commonest iatrogenic cause of proximal myopathy
corticsteroids
commonest underlying disease entity for Peripheral neuropathy.
diabetes mellitus
treatment of benign essential tremor
propanolol
2nd line primidone
how do you differentiate a clinically isolated syndrome form MS
one episode/ one MRI feature
vs MS = 2 separate relapses within 2 years
pathophysiology of MS
[autoimmune] demyelination in the brain and spinal cord
what is found in the CSF in MS
^protein
MS Tx in pregnancy
all drugs contraindicated, steroids not recommended
define progressive multifocal leukoencephalopathy
opportunistic brain infection caused by JC virus, seen in MS patients who are on disease modifying drugs
what causes optic neuritis
demyelination of the optic nerve
headache + papilloedema -> CT normal. You suspect a sagittal sinus thrombosis. How would you investigate this?
CT venogram
Ix idiopathic intracranial HTN
LP pressure
multiple family members with headache, otherwise well. Possible cause
CO poisoning
what is status epilepticus & main risk
when a seizure is not self limiting - medical emergency
cerebral ischaemia due to cardiorespiratory failure
management of status epilepticus
rectal diazepam/ buccal midazolam
risk of tensilon test for MG
bradycardia
MND Mx
riluzole
quinine for muscle cramps
baclofen for spasticity
glycopyronium bromide for secretions
morphine for breathless, ?NIV
antidepressants
OT, PT, palliative
microscopic changes in alzheimers brain
Amyloid plaques
Neurofibrillary tangles
Lewy-body Dementia drug Tx
donepazil or rivastigmine
if not tolerated: galantamine or memantine
GBS what infections
campylobacter, CMV, mycoplasma, zoster, HIV, EBV
bulbar palsy denotes disease of the nuclei of which cranial nerves in the medulla?
9-12
signs of bulbar palsy
flaccid fasiculating tongue [like a bag of worms]
quiet/hoarse/nasal voice
causes of bulbar palsy
MND GBS polio MG syringobulbia brainstem tumour central pontine myelinosis [rapid correction of hyponat]
bulbar and corticobulbar [pseudobulbar] palsies both affect the muscles of swallowing and talking. What is the difference?
bulbar = LMN/ medulla pseudobulbar = UMN/ pons
psuedobulbar/ corticobulbar palsy causes
stroke
MND
central pontine myelinosis
MS
1st line anti-epileptic for focal/ partial seizure?
carbamaz or lamotrigine
1st line anti-epileptic for generalised tonic clonic seizure?
sodium valproate or lamotrigine
1st line anti-epileptic for myoclonic seizure?
sodium valproate
other possible interventions for epilepsy other than anti-epileptic drugs
psych therapies e.g. relaxation/ CBT, [but dont improve freq]
surgery -if single focus
vagal nerve stimulaiton
give 2 valproate SEs
abdo pain alopecia agitation anaemia behaviour change poor concentration confusion deafness diarrhoea drowsy haemorrhage headache hepatic menstrual nausea nystagmus seizure tremor weight gain thrombocytopenia
Mx of intracranial venous thrombosis
anticoag [heparin/LMWH, then warf]
thrombolysis
thrombectomy
describe some different clinical presentations of MS
red. vision in 1 eye w/ painful movements
double vision
ascending sensory disturbance and/or weakness
problems with balance, unsteadiness or clumsiness
altered sensation travelling down the back and sometimes into the limbs when bending the neck forwards (Lhermitte’s symptom)
what bloods would you request in someone with suspected MS to rule out other diagnoses before R/F ing to neuro
full blood count
ESR/CRP
liver function tests
renal function tests
calcium
glucose
thyroid function tests
vitamin B12
HIV serology.
people involved in the multidisciplinary team looking after someone with MS
consultant neurologists
MS nurses
PT, OT
speech and language therapists, psychologists, dietitians, social care and continence specialists
GP
modifiable risk factors that you can counsel MS patients on
Preg [may get better then worsen Sx after delivery]
smoking increases progression
exercise
vaccine - flu, live ones may be contraindicated if on disease‑modifying therapies
define MS
chronic, immune-mediated, demyelinating inflammatory condition of the central nervous system, which affects the brain, optic nerves and spinal cord, and leads to progressive severe disability.
what are the 4 types of MS
relapsing remitting [most common]
secondary progressive [develops from R-R, ^ing disability unrelated to relapses]
primary progressive [gradual worsening, no relapses or remissions]
progressive relapsing [worsening from beginning + relapses]
drug treatment for secondary progressive MS [not including Sx management]
interferon beta 1b
drug treatment for primary progressive +
progressive relapsing MS
no specific, interferon beta sometimes used [unlicensed] for primary progressive
acute drug management of relapse in relapsing remitting MS
Oral methylprednisolone
[IV methylpred if oral failed /not tolerated /hospitalisation required]
management of fatigue in MS patients
exercise
CBT
Amantadine hydrochloride [unlicensed]
what factors might aggravate spasticity in MS patients?
constipation, infection, poor mobility aids, pressure ulcers, posture and pain
Mx of spasticity in MS
1st line: baclofen/gabapent
2nd line: Tizanidine or dantrolene sodium
3rd line: Benzos
management of oscillopsia in MS
gabapent [1st line]
memantine hydrochloride [2nd]
drug treatment for relapsing-remitting MS [not including Sx management]
active: beta interferon + glatiramer acetate
OR methyl fumurate + teriflunomide [ORAL]
more active: natalizumab/ alemtuzumab
for highly active or ^risk of PML: fingolimod
in a patient already on anticoag for prosthetic valve, who has an ischaemic stroke w/ risk of haemorrhagic transformation, how would you manage their anticoagulation?
anticoagulant treatment stopped for 7 days and substituted with aspirin
non-pharmacological Mx of parkinsons
PT
speech and lang therapy
OT
dietician
possible SEs of parkinsons meds
psychotic sx
drowsy
sudden onset of sleep
parkinsons drug Mx for postural hypotn
1st line: midodrine hydrochloride
2nd: fludrocortisone acetate
Mx of psychotic Sx in parkinsons
reduce parkinsons meds
quetiapine, 2nd line clozapine
mx of drooling of saliva in parkinsons
1st line: glycopyronium bromide
2nd: botox
drug mx of parkinsons dementia
rivastigmine/ donepazil/ galantaine
memantine if not tolerated/ contraI