10-04 Stroke Flashcards
Types of Strokes (2)
- Ischemic (Clot blocks blood flow)
- Hemorrhagic (Blood vessel ruptures)
- Ischemic is most common (80% of strokes)
Transient Ischemic Attack (TIA)
- Temporary interruption of blood flow
- Lasts few min or hrs, but less than 24 hrs
- No residual brain damage
- “TIA only lasts a day”
- Greater risk of stroke (15% of people)
Stroke
- Deficits last longer than 24 hours
- Permanent effect
- 4th leading cause of death in US
Motor Deficits (3)
- Hemiplegia (Paralysis on one side)
- Hemiparesis (Weakness on one side)
- Opposite Side (L infarction results in R hemiplegia/paresis; R infarction results in L hemiplegia/paresis)
Atherosclerosis
- Plaque formation
- Continues to grow along wall after formation
- Wall narrows, blocking blood flow
- Forms in bifurcate, angled areas
Arteriovenous malformation (AVM)
- Congenital condition
- Cluster, tangle of arteries and veins
- Progressive dilation eventually bleeds (50% of cases)
Stroke Risk Factors (Modifiable)
- Hypertension
- Heart disease
- Diabetes
- Smoking
- Diet
- Obesity
- Stress
Stroke Risk Factors (Non-modifiable)
- Age ( >55 yo)
- Gender (Women b/c they live longer)
- Family history
Stroke Risk Factors (Other)
- Atrial Fibrillaton (Abnormal heart beat - blood pools in heart, clots and comes out)
- TIA
Classic signs of stroke
- Sudden
- Numbness or weakness of face, UE, LE on one side of the body
- Confusion, difficulty talking or understanding
- Loss of vision in one eye
- Difficulty walking, dizziness, LOB
- Severe head without cause
- FAST - Face, Arm, Speech, Time
FAST
- Face, Arm, Speech, Time
- Face (Assymmetrical)
- Arm (Weak)
- Speech (Slurred)
- Time (How long)
T-PA
- Clot buster
- Given within three hours
- Used for ischemic, not hemorrhagic CVA
- Determine type of stroke with CT Scan
Stroke Pathophysiology
- Interruption of blood flow for few minutes –> Lack of oxygen –> Cellular damage and death within few minutes –> Cerebal Edema –> Tissue Necrosis
- Cerebral Edema increases pressure, shifts brain. Use shunt or cut skull out to relieve
- Edema subsides within 2-3 weeks
- Circle of Willis: Union of anterior, middle and posterior cerebral arteries that form in brain
L Hemispheric Damage (R sided deficits)
- Difficulties in communication
- Difficulties in processing info in sequence and linear
- Cautious, anxious, disorganized, more hesitant behaviors
- Needs lot of support from PTA/PT
R Hemispheric Damage (L sided deficits)
- Difficulty with spatial-perceptual tasks
- Difficulty understanding the whole idea of task/activity
- Overestimates abilities, Unaware of deficits, poor insight to problem, impulsive, impaired safety insight (affects motivation to get better)
CT Scan Imaging (Acute)
- Stroke less than three days old
- Rules out other brain lesions
- Identify hemorrhagic stroke
CT Scan Imaging (Sub-acute)
- Stroke 3-5 days old
- Development of cerebral edema
- Cerebral infarction
- Extent of CT lesion does not correlate with clinical signs of changes in function
MRI Imaging (Acute)
- Stroke 2-6 hours
- Identify cerebral infarction
- Detail extent of infarction or hemorrhage during first 2-3 weeks
- Can also detect smaller lesions than CT scan
- Do not use if metal in body (i.e., pacemaker)
Primary Impairments (7)
- Sensation
- Motor Function
- Postural control and balance
- Speech, language, swallowing
- Perception and cognition
- Emotional
- Bladder and bowel function
Sensation Deficits
- Frequentlty impaired, rarely absent
- Common pattern: face, UE, LE on one side
- Deficits affect opposite side of damage, can also affect ipsilateral side to a lesser extent
- Leads to impaired spontaneous movement
- Affects proprioception, light touch, pain, temperature, neglect, graphesthesia
Sensation: Thalamic Pain
- Central Post-Stroke Pain (CPSP) affects 70% of patients
- Constant burning pain
- Intermittent sharp pains
- Exaggerated pain response to stimuli
- Intolerable
- Delayed onset of pain (weeks to months)
- Spontaneous recovery is rare
“Shoulder Syndrome”
- Thalamic pain
- RSD (Reflex Symathetic Dystrophy)
- Shoulder-hand syndrome
- Arm is on fire (4 stages - first two are reversible, last two are not)
- Treat with joint mobility, ROM
Homonymous Hemianopsia
- Loss of vision in the contralateral half of visual field (nasal of one eye, lateral field of other eye)
- R sided damage will affect L visual field
- Incorporate mirror, PNF to cross midline
Visual Neglect
- Visually unaware of the left side of the world (left side does not react to stimulus)
- Head often turned away from hemi-side
- Problems with awareness of body parts, awareness of environment, depth perception, spatial relationships
- Treat by covering good eye, force pt to see with left side; force patient to use left side (mirror therapy, set objectives so patient has to literally turn to left to recognize that there is a world on that side)
Diplopia
- Double vision
- Both eyes are working, but not together
- Treat using patch, enables pt to see world as it should be
- Refer to OT to see how often to change patch position
Alterations in tone (Flaccidity)
- Hypotonia
- Acutely, altered by cerebral shock, followed by increase in tone)
- Temporary, but can persist for few days to few weeks
Alterations in Tone (Spasticity)
- Hypertonia
- Predominate in gravity-dependent muscles
- Occurs in 90% of patients
- Occurs on side of body opposite lesion
- Graded by Modified Ashworth Scale (MAS)
- Sx includes scissoring gait
Synergy Patterns
- Inability to perform isolated patterns
- Unable to perform isolated movements without producing movements in the remainder of limb (movements are grouped)
Stages of Motor Recovery (6)
- Stg 1: Flaccidity
- Stg 2: Early synergy, min to no voluntary movement
- Stg 3: Voluntary movement in strong synergy pattern
- Stg 4: Synergy declines; voluntary movement out of synergy pattern
- Stg 5: Movement independent of voluntary synergy movement, some residual spasticity
- Stg 6: Isolated volitional movements, near normal movement patterns, no spasticity
- (Stg 7: Normal motor function restored)
Altered Coordination (Motor deficits) (5)
- Ataxia
- Motor Weakness
- Timing and sequencing
- Bradykinesia (slow movement caused by basal ganglia)
- Involuntary movements: choreoathetosis, hemiballism
Ataxia
- Uncoordinated movement appears when voluntary movement is attempted
- Lack of proprioception, trying to walk across floor
Choreoathetosis
- Rapid worm-like movements
Hemiballism
- Jerking movements on one side of the body
Motor Praxis
- Ability to plan and execute coordinated movement
Apraxia
- Impairment of voluntary learned movement
- Characterized by inability to perform purposeful movement
Ideational Apraxia
- Inability to produce movements either on command or automatically
- Complete breakdown in conceptualization of task
Ideomotor Apraxia
- Inability to perform task on command and to imitate gestures, even though patient understands concept of task
- Able to carry out habitual tasks automatically
Reactive postural control
- Postural control based on reaction to an external force
Anticipatory postural control
- Self-initiated postural control
Factors causing postural control deficits (2)
- Timing and sequencing of muscle activity (postural sway, uneven weight distribution)
- Abnormal co-contraction
Postural control compensations (2)
- Balance issues
- Excessive hip movements
- Excessive knee movements
Pusher Syndrome
- High fall risk
- Ipsilateral/contraversive pushing: Active pushing with stronger extremities toward hemiparetic side –> fall towards hemiparetic side
- Patient may have aphasia
- Deficit in processing somesthetic info (sensory perception of body sensation (light touch, pain, etc.)
- Can last up to six months and disappear
- Interventions: Sit to stand with mirror/tape to show midline, reaching exercise across midline, relying more on stronger leg to balance
Pusher Syndrome (Functional Complications)
- No fear or sense of “pushing” from patient
- Pt strongly resists attempts to passively correct
- Results in instability (scissoring), asymmetry, deficits in transfers, standing
Aphasia
- Communication disorder
- Impairment in formulating, comprehending and/or use of speech
- 30% of patients affected
Receptive Aphasia
- Wernicke’s aphasia (fluent aphasia)
- Can talk, but does not understand