assessment and care of the stroke patient
TRANSCRIPT
Assessment and Care of the Stroke Patient
Megan McHugh, MS, RN, CCRN, CNRN
Stroke Coordinator
MedStar Georgetown University Hospital
Goals:
• What is Stroke?
• Stroke Statistics
• Types of stroke
• Imaging Basics
• Cerebrovascular correlations
• Common deficits
• Hyperacute stroke care/tPA
• Acute stroke care
• Deficits
What is Stroke?
Abrupt and dramatic development of a focal neurologic deficit caused by an occlusion or
hemorrhage of a vessel feeding the brain
Stroke Statistics
• Incidence • 795,000 new cases annually in the United States
• 610,000 are first strokes
• 185,000 are recurrent strokes
• 4th leading cause of death
• Prevalance • Symptomatic Stroke
• Men – 2.7% >= 18 years, 3.8% of black men
• Women – 2.5% >= 18 years have had a stroke
• Silent Stroke increases with age
• Age 55-64 11%
• Age 85+ 43%
Stroke Statistics
• Mortality • 5.5% of all deaths in the US.
• 12.6% off all stroke patients die within 30 days
• 8.1% of ischemic stroke patients
• 44.6% of hemorrhagic stroke patients
• Disability • Survivors:
• 15-30% totally disabled
• 20% institutionalized at 3 months
• Only 50-70% regain functional independence
• Expense • Direct medical cost of stroke in 2007 was $25 billion
• Direct and indirect cost in 2007 $41 billion
• Individual lifetime cost $140,000
Transient Ischemic Attack
(TIA) Definition
• Acute, neurological event that reduces blood flow to a portion of the brain
• Symptoms correlate with the region of the brain affected
• Two definitions: Time vs. Tissue • Time: Temporary weakness/numbness or visual
changes caused by vascular disease that resolves within 24 hours
• Tissue: No permanent damage, e.g. resolved symptoms with normal MRI
• One third of patients whose symptoms resolve have MRI scans positive for an acute stroke!!!
TIA Statistics
• 15% of all strokes heralded by TIA
• Risk of stroke
• Within 2 days: 3-10%
• Within 90 days: 9-17% (one study showed 20%)
• Death within one year: 12-13%
Classification of Strokes
Stroke
Ischemic 87%
Thrombotic
Large vessel 20%
Small vessel (lacunar) 25% Embolic
20%
Cryptogenic 30%
Hemorrhagic 13%
ICH 10%
SAH 3%
Stroke Recognition
• Sudden:
• Weakness or numbness
• Trouble speaking or understanding
• Trouble seeing in one or both eyes
• Trouble walking, loss of balance or coordination
• Severe headache
Hemorrhagic Stroke
• 15-20%
• Intracerebral
Within the brain
parenchyma
• Subarachnoid
• Aneurysm
• Vascular malformations
Types of Stroke: Summary
• Clots can form in an artery or travel from someplace else
• Blood vessels that burst inside the brain tissue cause intracerebral hemorrhages
• Blood vessels that burst in the subarachnoid space cause subarachoid hemorrhage
• Clots in the venous drainage system can lead to either type of stroke
Imaging 101
• MRI and CT are looking from the bottom up
• The left side of the image is the right side of the brain
• The right side of the image is the left side of the brain
Imaging basics: CT
• Best for showing acute blood
• Normal for 12-24 hours post stroke
• Important: CT read as “negative for acute stroke” that was done less than 24 hours after last normal does NOT mean they didn’t have a stroke!
Imaging Basics: MRI
• DWI (Diffusion weighted image) positive in seconds, stays positive for about two weeks.
• Areas of restricted diffusion, e.g. ischemia are bright (“light-bulb”)
• Flair (Fluid Attenuated Inversion Recovery) is positive in 6-12 hours, lasts forever
• Ischemia is bright, fluid is dark.
Blood Supply of the Brain
• Three come in: Basilar (Vertebrobasilar) formed from L and R vertebral
L & R Internal carotids
• Circle of Willis (the “beltway”)
• Six go out (three per side): ACA – anterior cerebral artery
MCA – middle cerebral artery
PCA – posterior cerebral artery
Symptoms, by Vessel Insufficiency: ACA
• Personality change
• Confusion
• Incontinence
• Leg weakness greater than arm weakness
• Difficulty tracking
• Motor/sensory changes on opposite side of body
Symptoms, by Vessel Insufficiency: MCA
• Middle cerebral artery
Motor/sensory changes on opposite side of body
Arm weakness greater than leg weakness
Same side visual changes
Left—speech
Right—knowing where body parts are
Symptoms, by Vessel Insufficiency: PCA
Opposite-side sensory loss
Same-side vision loss
Left—communication
Right—knowing where body parts are
Graying of vision
Symptoms, by Vessel Insufficiency
• Carotid artery
Opposite motor/sensory loss
Amaurosis fugax (fleeting blindness)
Right—knowing where body parts are
Left—speech
PICA Occlusion
• Largest branch off vertebral
• One of the three main arterial supplies for the cerebellum
• Other two are SCA and AICA
QuickTime™ and a decompressor
are needed to see this picture.
Quic kTime™ and a decompress or
are needed to see th is p ic ture.
Dizziness
Nausea and vomiting
Ataxia
Dysarthria
Dysphagia
Eye movement
Facial weakness
Hearing loss
Symptoms, by Vessel Insufficiency: Vertebrobasilar
Clinical Presentation: Right Hemisphere
Neglect—body part or loss of function not acknowledged
Flat or bland affect
Apraxia—partial or complete inability to execute purposeful movement
Left hemiplegia/hemisensory loss
Speech changes—expressive, receptive, global aphasia
Right hemiplegia/hemisensory loss
Clinical Presentation: Left Hemisphere
• Brain stem
Hemiplegia/quadriparesis
Loss of sensory in ½ of body or all four limbs
Dysarthria
Dysphagia
Ataxia
Nausea and vomiting
Cranial nerve changes
Clinical Presentation: Brain Stem
Stroke Treatments: Ischemic
•Geared towards the cause:
•Ischemic: •Dissolve the clot (tPA) • <3 hours (FDA)
• <4.5 hours (ECASS 3 trial, AHA)
•Retrieve the clot
•Manipulate blood pressure
•Remove the clot/plaque surgically (CEA)
•HOB flat, SBP up to 220 mmHg • to increase perfusion to penumbra
• SBP < 185 mmHg for tPA
Stroke Treatment: Hemorrhagic
• Intracerebral hemorrhage
• Subarachnoid hemorrhage
• Main differences
• BP parameters
• HOB flat or elevated
• No antithrombotics or anticoagulation
• Coagulopathy
Stroke Treatments
• Blood pressure manipulation • Can be elevated to keep vessels open
• Can be lowered to prevent more bleeding
• Brain perfusion manipulation • HOB flat increases perfusion
• HOB elevated increases drainage and lowers ICP
Signs and symptoms reveal location:
• Sudden weakness or numbness
• Sudden loss of vision
• Sudden difficulty speaking or understanding
• Sudden dizziness or loss of balance
• Sudden severe headache
“Sudden” is the key!
Common Deficits
• Aphasia
Expressive aphasia – can understand what you are saying but cannot get the right words out, speaking gibberish, or mute
Receptive aphasia – cannot understand what is being said to them; likened to being in a foreign country where you don’t know the language
Can have both expressive and receptive aphasia
Give pt time to try to communicate – remember they may be very frustrated
Common Deficits
• Swallowing difficulties
May silently aspirate, without even a cough
Common cause of increased mortality
Swallow screen by the nurse and full evaluation help identify these patients so that we can feed safely and reduce risk.
Well-meaning family need education about aspiration pneumonia so they understand why we may delay starting feedings
Aspiration precautions for all: Sit up 90 degrees to feed, small spoonfuls, correct consistency, don’t rush, stop if coughing
Common Deficits
• Hemiplegia
Most often one side of the face/arm/leg weak or flaccid
Can easily dislocate a shoulder if you pull on it repositioning the patient; often develop shoulder pain even without overt injury
Prop weak arm up on a pillow, hand above heart to reduce dependent edema
Common Deficits
• Neglect
Pt may be unaware of the weak side of the body
May not look towards that side, may not see that side
May not know that there is a problem, so they try to get out of bed and fall
Pay attention to the patient – try to feed them and address them from the bad side to help in recuperation
Care goals:
• Prevent secondary injury/ infections • Prevent pressure ulcers by frequent
repositioning • Prevent edema by elevating flaccid
extremities on pillows • Prevent aspiration pneumonia by swallow
screens, aspiration precautions • Prevent contracture by doing range of motion
exercise every shift in weak limbs • Prevent falls: patients with symptoms of
neglect/ visual cuts are at very high risk
Remember the Basics
• Infection
• DVT
• Pneumonia
• Bowel/bladder care
• Constipation
• Incontinence
Remember the Basics
• Mobility
• Falls
• contractures
• Skin care
• Avoid breakdown
• Detect dysphagia
• Swallow assessment
• Nutritional compromise
Summary
• Care is the KEY to RECOVERY
• Symptoms determined by vessel(s) affected
• In-hospital care is only the beginning
• Rehab and improvement continue for many months
References Revised and updated recommendations for the establishment of primary stroke centers: a summary statement from the Brain Attack Coalition (2010). Stroke (41) 2402-2448. Retrieved from http://stroke.ahajournals.org
Heart Disease and Stroke Statistics 2011 Update: A Report from the American Heart Association. Retrieved from http://circ.ahajournals.org
Expansion of the Time Window for Treatment of Acute Ischemic stroke with Intraveious Tissue Plasminogen Activator: A science advisory from the American Heart Association/ American Stroke Association (2009)
Comprehensive Overview of Nursingand Interdisciplinary Care of the Acute Ischemic Stroke Patient: A scientific statement from the American Heart Association (2009)