Neuro Flashcards
What is the main risk factor of stroke?
HTN
List factors that convey a better prognosis for MS?
Under 25
Optic neuritis or sensory disturbance as primary complaint
Greater than 1 year between events
Few lesions on MRI
Female
What is amaurosis fugax?
Painless unilateral vision loss of short duration.
What causes amaurosis fugax?
Retain artery emboli due to AF
What is the immediate Tx of stroke? Why?
1st = nil by mouth –> prevent aspiration pneumoia
2nd = CT head –> can tell between ischaemic and haemorrhagic better
List complete contraindications to thrombolysis in stroke Tx
Onset more than 3hrs ago
Current seizure
BP > 180/110
Surgery less than 2 weeks ago
Bleeding
Previous intracranial bleed
LP less than 7 days ago
Stroke less than 3 months ago
Spine claudication, lumbar pain, sciatica on moving. Better when walking uphill vs down. Dx?
Spinal stenosis
Ascending polyneuropathy and associated motor loss. Dx?
GBS
What causes GBS?
Inflammation of peripheral nerves
List Sx of PD
TRAID = bradykinesia, tremor, rigidity
ALSO: narrow based gait, hypomimia, micrographia, kicking/yelling in sleep, autonomic dysfunction, postural instability
Pt fitting for 20 mins. Had 2 x rectal diazepam and still fitting. What is going on?
Status epilepticus
Woman w bad migraines taking co-codamol and ibuprofen. Headaches getting worse. Mx? Why?
Stop all Tx
Medication over use headache now
What is Tx for status epilepticus?
Phenytoin loading
Call ITU
What is the indication for requesting phenytoin levels?
Dose adjustment
Patient compliance
Toxicity - if Sx suggestive of this
Woman stares blankly for 1 minute then starts picking at clothes. Returns back to reality feeling tired. Dx?
Complex partial seizures
What feature differntiaties compelx and simple partial seixures?
Complex = dont remember event
SImple = retain conciousness, so remeber event
What feature is indicative of compelx partial seizures?
Pts carry out repetitive and purposeless motions such as chewing / lip smacking / picking at clothes
What feature is indicative of absence seizures?
In KIDS
Stare blankly for a few seconds
Traid of Wernicke’s ?
What is Korsakoff’s?
Anterograde amnesia (forget new information)
Post alcoholic
Signs of Wernicke/Korsakoff’s?
Broad gait but clumsy
Diplopia
Low MMSE - can’t register new info
Pt has 5/5 power upper limbs but 0/5 power lower limbs. Where is the lesion?
Spinal cord
What is the dermatomal level of the shoulders?
C4
What is the dermatomal level of the nipples?
T4
What is the dermatomal level of the umbillicus?
T10
What is the dermatomal level of pockets?
L1
What is the dermatomal level of the knee?
L3
Crossed signs (eg L arm but R face) indicate that the lesion is where?
Brainstem
R arms and legs affected but also L face. Where is the lesion?
Left brainstem - R motor tract but L cranial nervee
In the swinging torch test, which cranial nerve is efferent and which is afferent?
A = CN 2
E = CN 3
What is the name of a failed swinging torch test lesion?
Relative afferent pupillary defect
What feature distinguishes myopathy from MG?
Fatiguability
Why are MG muscles fatiguable?
Use up the ACh to exhaustion therefore fatigued
How does MG differ from Lambert-Easton syndrome?
LE = increased repeition leads to increased strength
MG = increased repetion leads to decreased strength
What causes Lambert Easton?
Auto AB against VGCC
Which condition is Lambert Easton most associated with?
Small cell lung cancer
What conditions is MG associated with?
Thyrotoxocosis, haemolytic anaemia, pernicious anaemia, connective tissue disease
Is Bells palsy UMN or LMN?
LMN
What is Mx of Bells palsy?
Lubricating eye drops & taping eye shut at night
Steroids and acyclovir if PC <48hrs
What is the most common cause of UMN facial palsy?
Stroke
What causes intranuclear opthalmoplegia?
Problem with communication between CN VI of right eye and CN III of left eye - often a lesion in the medial longitudinal fasciculus
Name a common cause of opthalmoplegia
MS
Flick distal phalynx of middle finger and thumb will contract. What sign is this?
Hoffman’s sign
What does Hoffamn’s reflex indicate?
UMN lesion
What features are classic of Lewy-Body dementia?
extra-pyramidal (parkinsonian)
Pt has disinhibition and problems finding words. Dx?
Fronto-temporal dementia
Causes of absent ankle jerk with upgoing plantars?
Cord compression
Cord degeneration
MND
Freidrich’s ataxia
Is MS UMN, LMN or mixed?
UMN only - never has LMN signs
Unsteady gait, difficulty raising right leg which he swings round in an arc on walking. R arm and wrist are flexed. Dx?
Hemiplegic gait
Which conditions have a scissoring gait?
MS and cerebral palsy
Which condition has a high stepping gait?
Foot drop
Which condition has a stomping gait?
Diabetic neuropathy
R lower quadrantoptia. Where is the lesion?
L parietal lobe
R upper quadrantopia. Where is the lesion?
L temporal lobe
Dizziness on moving head. Dx?
BPPV
Dizziness, tinnitus, hearing loss and sensation of increased ear pressure. Dx?
Menieres
Where does Meneires affect?
Inner ear
How do you differentiate Menieres from vestibular neuronitis?
VN does not affect hearing but Menieres does
Cafe au lait spots, axillary freckling and neurofibromas. Dx?
Neurofibromatosis type 1
Bilateral acoustic neuromas leading to deafness. Less cutaneous manifestations. Dx?
Neurofibromatosis type 2
Telangectasia, epistaxis, vascualr disorders. Dx?
Hereditary haemorrhagic telangectasia
What is evident on CT of extradural haematoma?
Lenticular (convex) shaped haematomas
Who gets subdural haematomas?
Elderly and alcoholics
Thunderclap headache. What does CT head show?
Blood along sulci and fissures (SAH)
Stroke w visual problems, dizziness, nystagmus and dysdiadokinesis. Where is lesion?
Posterior circulation - occipital lobe
Aphasia, agnosia, agraphia. Where is the lesion?
Left parietal lobe
Memory probelms with upper quadrantopia. Dx?
BILATERAL temporal lobe lesions
Visual / sensory / motor neglect. Dx?
RIGHT parietal lobe
5 day Hx of numbness and tingling in hands and feet, getting worse and worse. Complete resolution after 1 weeks. Dx?
GBS
What is Kernig’s sign?
Patients leg is held flexed at hip and knee and there is pain and resistance on susequent knee extension
Meningism with LP results of:
normal glucose
low protein
high lymphocytes
Dx?
Viral meningitis
Meningism with LP results of:
low glucose
normal/raised protein
high neutrophils
Dx?
Bacterial meningitis
Meningism with LP results of:
low glucose
high/normal protein
high lymphocytes
Dx?
TB/fungal meningitis
LP results of:
high glucose
very high protein
high RBC
Dx?
SAH
Patient stands with feet together and closes her eyes. Unable to keep still. What test is this?
Rombergs
What does positive Rombergs show?
Proprioceptive loss