stroke Flashcards
Stroke/CVA
brain attack
A stroke, also known as a cerebrovascular accident (CVA), is the rapid loss of brain function(s) due to disturbance in the blood supply to the brain. This can be due to ischemia (lack of blood flow) caused by blockage (thrombosis, arterial embolism), or a haemorrhage (leakage of blood).
Classification
Haemorrhagic stroke
Ischaemia stroke
Haemorrhagic stroke
bleeding from a cerebral artery
Subarachniod haemorrhage
bleeding into subarachnoid space
due to rupture of congenital anerysm or trauma
sudden intense headache, vomiting, neck stiffness and loss of consciousness
10% die within two hours
40% die within two weeks
Aneurysm
saccular
fusiform
ruptured
treated by surgical clipping
Intracerebral haemorhage
bleeding in deeper part of brain longstanding hypertension arterial wall weaken micro-aneurysm develop rupture and bleed sever headache and vomitting
Ischaemic stroke
80% strokes due to occulsion
atherom of cerecral artery
emboli from atheromatous plaque in hear/neck vessel
Most common vessel: MCA > PCA > ACA> brainstem (more serious)
Embolic stroke
completed stroke -tia-
sudden onset
blood clot that forms elsewhere in the body (embolus) breaks loose and travels to the brain via the bloodstream.
lodges in cerebral artery distruptiung the flow of blood
artrial fibrilation
Atrial fibrillation is irregular heartbeat,blood clots are more likely to form in your heart, increasing stroke risk
thrombotic stroke
completed stroke-tia- overnight develops over several days early full recovery 20% risk of full CVA with a month
Bamford classification
TACS – Total anterior circulation stroke
PACS – Partial anterior circulation stroke
POCS– Posterior circulation stroke
LACS – Lacunar stroke(deep penetrating arteries)
(TAC)S=stroke
(TAC)I=infarct
(TAC)H=haemorrhage
Tramatic brain injury
injury to the brain caused by external physical force,
altered state of consciousness
impairment of cognitive or physical abilities
disturbances of behaviour or emotional functioning
temporary or permanent
Mechanism of injury
Penetrating injury-risk of infection
Compression - inner cerebral traume
Deceleration- outer cerebral injury discrete cognitive deficit
Diffuse axonal injury– poor communication between brain structures, reduces processing speed, global impairment
Extradural haemorrhage
bleeding into extradural space
cause by severe trauma
subadural haemorrhage
bleeding in subdural space
usually cause by severe trauma
maybe be delayed symptons
headache drowsiness stupor- altered state of conciousness hemiparesis coma