Cerebrovascular Accident (CVA) Flashcards
What is a transient ischemic attack (TIA)?
- temporary focal loss of neurological function
- temporary loss in vision, change in speech, unilateral motor and/or sensory symptoms
- symptoms last up to 24 hours (average is 15 minutes to 3 hours)
- no lasting effects
What is an ischemic stroke?
85% of all strokes
Thrombotic:
- caused by atheromatous plaques that occlude cerebral arteries
- narrowing of artery with fat deposits; build up enough to cause a blockage
- TIA in 30-50% of causes; occur during of after sleep
- develops slowly over time; symptoms get worse with progression
Embolic:
- dislodged thrombi (emboli) that occludes cerebral arteries
- TIA is uncommon; sudden onset, no relationship to activity
- recurrence is common if underlying disease is untreated
Hemorrhagic:
- cerebral arterial wall rupture; bleed in brain tissue, ventricles, or subarachnoid space
- associated with severe headache before stroke. No TPA if hemorrhagic stroke
What are the managment recommendations for ischemic stroke?
- Treat the CVA as an emergency. Call 911, NOT MD when symptoms are first noticed.
- Change name to BRAIN ATTACK so people will associate it with an emergency
- Treatment with thrombolytic agent tPA, must be started within THREE HOURS of onset of symptoms (may be as long as 6 hours for ischemic CVA only). TPA leads to fewer deaths and fewer disabilities.
What are symptoms of an ischemic stroke?
Symptoms include change in mental status, LOC, abnormal speech, facial droop, UE or LE weakness on same side of the body
What do you do in the first ten minutes with a stroke patient?
- Assess ABCs (airway first)
- Maintain NPO (risk for aspiration until swallow eval
- provide O2, insert 2 large bore IV lines, infuse at 0.9% NS
- draw labs/BG - stroke or are they hypoglycemic?
- 12 lead EKG, complete neuro assessment (baseline)
- alert stroke team with time of arrival
What do you do within the first 25 minutes with a stroke patient?
- review medical/nursing history
- establish time of stroke onset
- GCS, NIHSS (more specific)
- complete physical assessment
- STAT non-contrast CT read within 45 minutes of arrival to ED
What are the three causes of stroke?
thrombus
embolus
hemorrhage
What are modifiable risk factors for stroke?
- Smoking
- Obesity
- Inactivity
- Poor diet
- Hyperlipidemia
- Elicit drug use
- Sickle cell crisis
- Meds (birth control, NSAIDs, anti-coagulants)
- Alcohol intake
What are non-modifiable risk factors for stroke?
- age risk doubles each decade after age 55
- family history
- genders equal, but women more likely to die
- race: africian american males, hispanic, asian/indian american
What are the diagnostic studeis for stroke?
PT/INR, CBC (esp hct, hgb, platelets), BG/chem 8 to rule out hypoglycemia and electrolyte imbalances. CT non-contrast scan or cerebral angiogram.
What does the location of stroke have to do with the effect on the body?
- Symptoms above nose: same side of the brain
- Symptoms below nose: opposite side of the brain
- Symptoms are contra lateral to lesion in the brain
What are the TNIs in the acute phase of stroke?
prevent secondary brain injury by providing general body system support and preventing complications. rehabilitation begins upon admission. first hours: assess neurological status
Risk for altered tissue perfusion
maintain BP and CPP WNL without increased ICP, provide fluids, monitor I/O. Goal: BP high enough to keep CPP normal
ROM/Ambulation
patient has risk of DVTs (check Homan’s sign) and PE. Prevention: SCD/TEDs, promote hydration, monitor I/O, encourage ambulation/ROM as appropriate.
Risk for injury
initially, muscles on the affected side are flaccid but within a few days they become spastic (increased muscle tone). TNIs:
- pt. positioning in bed can prevent contractures/long-term complications
- Intermittent use of splinets may be needed
- risk for shoulder subluxation - don’t pull pt. up by arms for position changes. In bed, support affected arm on pillow. In sitting position, firm surface to support the affected arm