Neuro - stroke, MMA, VST + brain haemorrhages Flashcards
Def stroke
Acute focal neurological deficit
CV in origin
Persisting >24hrs
Def TIA
Acute focal neuro deficit persisting <1hr
No longlasting signs on MRI
Def amaurosis fugax
Sudden transient LOV in 1 eye
RF stroke - irreversible (4)
age
PMHx/FHx
Hyper-coagulable states
AF
RF stroke - reversible (8)
HTN Hypercholesterol DM Smoking Alcohol Poor diet/exercise Obese COCP
What are the 2 broad categories of stroke + prevelance
Ischaemic - 85%
Haemorrhagic - 15%
What is an ischaemic stroke due to
Arterial embolus from distal site
Or aa thrombosis from carotid/vertebral/basilar aa
What are the 2 types of haemorrhagic stroke
SAH - 5%
Intra-cerebral - 10%
Where has stroke happened in TACS
Proximal MCA occclusion
TACS
all 3 of:
High dysfunction
Homonous hemianopia
Hemiplegia + sensory loss
Where has stroke happened PACS
Distal MCA/or ACA occlusion
PACS
2/3 of:
High dysfunction, homonymous hemianopia, hemiplegia/sensory loss
Higher dysfunction alone
Where has stroke happened - LACS
Lacunar branch of MCA
LACS
2/3 of: face, arm, legs Pure motor Pure sensory Pure sensorimotor Ataxic hemiparesis
where has stroke happened - POCS
PCA occlusion
POCS
CN palsy + contralat deficit Bilat motor or sensory deficit Eye movement problems Cerebellar dysfunction Isolated homonous hemianopia
% who die from TACS in a year
60%
% dead from PACS in a year
15%
% dead from LACS in a year
10%
What is NHISS
15 item neuro exam assessing stroke on various levels
Ix stroke
Bloods - FBC, U+E, gluc, lpipids, coag, ESR
Imaging - MRI (gold standard)/ CT
ECG
Acute Mx stroke
A-E
Withold antiplatelets until CT headh
Arrange thrombolysis if <4.5hrs
Thrombolysis
Check C/I
Alteplase 0.9mg/kg 10% bolus 1 min
Remainder over 60 mins
What Mx stroke if thrombolysis C/I
300mg aspirin daily
2’ prevention stroke
lifestyle mods antiHTN therapy Aspirin 300mg od 2w Clopidogrel 75mg life statin LMWH stated day 3 post stroke
Non-pharma Mx stroke
SALT (assess within 2w)
physio
OT
Nursing + SSKIN
Driving + stroke
No driving 4 w
complications stroke
Malignant MCA syndrome DVT/PE Aspiration pneumonia P sores Depression Incontinence
What is malignant MCA syndrome?
Rapid neuro deterioration due to effects cerebral oedema
PS Malignant MCA syndrome
Incr aggression/restlessness
Decr GCS
Haemodynamic instability/thermal instability
Incr ICP
Mx malignant MCA syndrome
Decompressive hemicraniotomy
High risk features TIA (3)
Rec TIA
AF/TIA whilst anti-coag’d
ABCD score 4 or more
ABCD scores
Age >60 BP >140/90 Unilateral weakness = 2 points Speech disturbance w/o weakness = 1 point >60mins - 2 points 10-59 mins = 1point Diabetes = 1 point
Mx - high risk TIA (3)
Statin
300mg aspirin
specialist clinic within 24hrs
Mx - low risk TIA (3)
Statin
300mg aspirin
specialist clinic within 1 week
What is done at specialist TIA clinic
Carotid USS
If stenosis >50% - carotid endarterrectomy offered
What is venous sinus thrombosis
Venous infarction –> vascular congestion –> haemorrhagic necrosis
When to suspect venous sinus thrombosis
If thunderclap headache + incr ICP
W/ no signs meningtitis + + no changes on CT
What are the 2 types venous sinus thrombosis?
Cortical venous thrombosis
Dural venous sinus thrombosis
Sx cortical venous thrombosis
Headache (thunderclap) focal signs seizures fever encephalopathy
Sx dural venous sinus thrombosis - cavernous sinus
Ocular pain (incr on movement) Proptosis Ophthalmoplegia Papilloedema Fever
Sx saggital/lateral dural sinus vv thrombosis
Sx of Incr ICP
Ix venous sinus thrombosis
CT = norm
LP = incr ICP
MRI angio = diagnosis
RF venous sinus thrombosis (7)
OCP Pregnancy Malig Thrombophilia Head injury Recent LP Infection
Cause - deep intra cerebral haemorrhage (2)
Rupture microaneurysms - Charcot Bouchard
Degen small deep aa
Who suffers from lobar intra-cerebral haemorrhage
Normotensive indivs >60
Ix intracerebral haemorrhage
CT- can see immediately
MRI - can see after 2hrs
Mx intracerebral haemorrhage
NO antiplatelet/coags
Reverse coag
Lower BP within 1hr using IV betalol
Rx to neurosurgery
PS - SAH (5)
thunderclap headache Vom after headache Incr drowsiness/coma Photophobia Focal signs may point to lesion
O/E SAH
Neck stiffness
+ve Kernigs sign
Papilloedema
2 vascular abnormalities that predispose to SAH
Berry aneurysm
AV malformations
Most common location Berry aneurysm
ACA
which conditions are associated w/ increased development of berry aneurysms
PKD
ED
Marfans
What can PCA Berry aneuysms lead to
Painful CN3 palsy
Ix SAH
Bloods: FBC, U+E, LFT, ESR, clotting
CT -
LP if CT norm
CT/MRI angio
LP findings SAH
CSF will be xanthochromic
Mx SAH
4 w bed rest HTN control Nimodipine IV fl Analgesia/anatiemetics Stool softeners
Neurosurgery Mx SAH
Coiled by IR
What % SAH rebleed within weeks
10-20%
What % of pt w/ SAH develop hydrocephalus
11%
Role of nimodipine in Mx SAH
Prevents vasospasm
Which reduces mortality
% death from SAH immediately
30%
When do berry aneurysms rebleed after SAH
3-4 days
when do AVM bleed after sah
years after
why do you get hydrocephalus after SAH
due to fibrosis in CSF pathway
what is a subdural haemorrhage
collection of blood in subdural space between arachnoid and dura
cause acute subdural haemorrhage
severe acceleration - deceleration head injury
PS acute subdural haemorrhage
Young adults
Dilated pupil
Decreased GCS
Mx acute subdural haemorrhage
craniotomy + early evacuation of clot
ICP monitoring
Consequences of acute subdural haemorrhage (3)
epilepsy
neuro disability
death
RF subacute subdural haemorrhage (3)
elderly
alcohol abuse
coagulopathy
PS subacute subdural haemorrhage
3w after insult headache drowsy confusion stupor/coma
Mx subacute subdural haemorrhage
craniostomy/craniotomy
Ix subdural haemorrhage
CT
CT findings - acute subdural haemorrhage (4)
cresent shape
incr density (white)
midline shift showing compression of ventricles
CT findings - chronic subdural haemorrhage
Blood darker
lentiform
Norm ICP
0-10mmHg
Causes of raised ICP
Tumour Trauma ischaemia infection cytotoxic - cell death obstructive hydrocephalus
PS raised ICP (9)
Headache - worse on lying, PS on waking and worsened by straining vom seizure irritability GCS decline progressive dilatation of pupil on affected side cushing reflex cheyne stokes breathing papilloedema
Mx raised ICP
A-E elevate head 30' mannitol 0.2./kg IV over 15 mins CCS fl restirct neurosurgery