Neuro Flashcards
difference between ischaemia and infraction
ischaemia= reduced tissue supply
infarction= death of tissue due to reduced blood supply
what tool is use to identify stroke in an acute medical setting
ROSIER
how are TIAs mx
start 300mg aspirin daily
refer to a specialist TIA clinic within 24 hrs (within 7 days if it was more than 7 days ago)
diffusion weighted MRI scan to image
how are TIAs imaged
diffusion weighted MRI scans
how is aspirin given in suspected stroke
300 mg daily for 2 weeks
start after haemorrhage excluded by CT
how is blood pressure managed in a stroke
blood pressure is not lowered in ischaemic stroke
blood pressure is agressively lowered in haemorrhagic stroke
alteplase moa
tissue plasminogen activator
in what time frame of presentation is thrombectomy done for stroke
within 4.5 hrs
when is thrombectomy indicated in stroke
complete block of the posterior or anterior circulation
what 2 conditions are screened for when someone has a IA or stroke
carotid artery stenosis
AF
secondary prevention of stroke
ABCD
atorvastatin 20-80mg
blood pressure control
clopidogrel 75mg daily
diabetes control
what dose of statin is given in secondary prevention of stroke and when
20-80mg atorvastatin
not immediately delay by 48 hrs
what is given for secondary preventation of stroke/TIA when clopidogrel cant be given
aspirin plus dipyrimadole
blood vessel implicated in extradural haemorrhage
middle meningeal artery
blood vessels implicated in subdural haemorrhage
bridging veins
when is CT reliable for imaging in an SAH
first 6 hrs
after this its less reliable
how many hrs after CT head should lumbar puncture be done in SAH
after 12 hrs (to allow for build up of bilirubin)
what medication is given after SAH to prevent vasospasm
nimodipine
what part of the nervous system does multiple sclerosis affect
central
specifically oligodendrocytes
symptoms of optic neuritis
unilateral loss of vision
enlarged blind spot (central scotoma)
opthalmoplegia
red desaturation (impaired colour vision)
relative afferent pupillary defect
what is RAPD
when the pupillary light reflex is reduced when shining a light into the affected eye, but the consensual reflex in the affected when shining a light into the normal eye is normal
causes of optic neuritis
MS
sarcoidosis
SLE
measles/mumps
lyme disease
syphilis
optic neuritis mx
high dose steroids
what is intranuclear opthalmoplegia
a lesion in the medial longitudinal fasciculus (connects the cranial nerve nuclei that control eye movements)
there is impaired adduction in the affected eye and nystagmus in the contralateral eye
what eye movement abnormality is seen in intranuclear opthalmoplegia
inability to adduct the affected eye and nystagmus on abduction in the other eye
lhermittes sign
electric shock like pain down the spine when flexing the neck- occurs due to demyelination in the spine in MS
2 types of ataxia
sensory
cerebellar