COMPS:CVA Part II: Focus on CVA EXAM 1 Flashcards
Middle Cerebral Artery
In relation to Circle of Willis
MCA
Lat. Surface of the Brain
UE’s
MCA occlusions are generally MORE ________ than ________
MORE Embolic
*Clot from Somewhere else in body travels to brain
MCA is the most often occluded artery as a result of:
Vascular disease
MCA supplies:
*Most often occluded artery*
Lateral surface of the brain (UE’s according to Homonculus)
BG
portions of Internal Capsule
MCA Occlusion: what are the results?
Results in:
-
ALL Contralateral (opp. side)
- contralat spastic hemiparesis
- contralat hemianesthesia
- contralat homonymous hemianopsia
- ==> impaiment in conjugate gaze in direction opp the lesion
Explain Contralateral hemianopsia in MCA occlusions
- Impairment in Conjugate gaze (keeping eyes focused together on target)
- In direction OPP the lesion
W/ MCA occlusion: what happens if L hemisphere involved
AND is the language dominant side?
- Global Aphasia
- Expressive and receptive communication disorder
W/ MCA occlusion: what happens if R hemisphere affected?
- Anosagnosia–> denial of illness or lack awareness of problem
- W/OUT Aphasia
UPPER division of MCA occlusion
-
NON-Fluent Broca’s - Oromotor aphasia
-
seen w/ hemiparesis in face and UE MORE than LE
- bc MCA is UE’s (lateral brain)
-
seen w/ hemiparesis in face and UE MORE than LE
UPPER division MCA occlusion
Broca’s Oromotor aphasia
Called this….
Brachial Syndrome
Broca’s area affected (UPPER division MCA) === Broca’s aphasia
which is what?
Non-fluent, expressive problem
NOTE: comprehension is OK
NOTE: have trouble w/ MOTOR output of speech
INFERIOR Division MCA occlusion: Dominant side (language side)
Wernicke’s aphasia w/out hemiparesis
arm/leg sparred
Broca’s aphasia (UPPER division MCA) you WILL see
hemiparesis face and UE
INFERIOR division MCA occlusion (Wernicke’s aphasia) you will NOT see
hemiparesis
Wernicke’s Aphasia W/out hemiparesis…
Likely findings Associated w/…
- Hearing intact, auditory COMPREHENSION lost
- Alexia (unable to read) Agraphia (unable to write)
- distortion of articulate speech
- Hearing intact
Wernicke’s Aphasia w/out hemiparesis
Describe the speech
*remember comprehension lost
*remember word salad
- Speech is Fluent w/ natural language rhythm, BUT
- has neither understandable meaning nor syntax
- **Despite loss of comprehension, word memory is preserved and words are often chosen correctly
What TYPE of Aphasia is Wernicke’s ?
Expressive, Fluent aphasia
*person may speak fluently w/ natural rhythm, but result has neither understandable meaning nor syntax
INFERIOR division MCA occlusion: NON-dominant side (non-language side)
yields:
- PURE hemiplegia (half paralysis) OR
- spatial agnosia (hemineglect) WITHOUT weakness
- lose sensory function on that side AND proprio. awareness
ACA
In relation to Circle of Willis
ACA
LE’s!!! Middle of homonculus
Brain region covered
LE’s
Middle of homonculus
ACA syndrome occurs due to _______ MORE than __________ and is __________
Occurs due to Embolism (moves around) MORE than thrombus
RARE!!!
Why is ACA syndrome frequently asymptomatic?
Good collateral circulation
W/ ACA syndrome: If the Dominant Language side is affected:
what happens ?
- Abuila
- inability to make decision
- reduction in rate and complexity of speech
- aka scanning speech—> pauses b/w words
ACA syndrome: Dominant language side
whats affected limb wise and result wise?
Contralateral LE > UE
paresis and sensory loss
remember ACA is medial side homonculus==> LE
Internal Carotid Artery syndrome can be due to 3 things:
- Hypoperfusion
- Embolus–moves around
- Thrombus–blockage in one place
Frequently an accompanying symptom of ICA syndrome
why??
- Transient MONocular blindness
- aka amaurosis fugax
- bc ICA supplies Opthalmic artery
Explain Transiet monocular blindness
sx ICA syndrome
- Temp. fading of vision or blindness
- mins—> days
- due to DEC blood supply from ICA to opthalmic artery
ICA is very close in proximity to MCA
what does this mean?
IC occlusion often results in MCA syndrome
w/ an ICA syndrome,
COMPLETE blockage w/out adequate collateral circulation results in what?
- deficits in both MCA and ACA
PCA
in relation to Circle of Willis
PCA syndrome: Central occlusion
most affected areas?
- Subthalamus
- Medial thalamus
- Ipsilateral (same side) cerebral peduncle
PCA distribution
In brain…
Proximal PCA syndromes
Where in the brain would this occur?
See pic!!!
3 results from Proximal PCA Syndromes
- Thalamic pain syndrome
- Contralateral hemiplegia from cerebral peduncle involve.
- Hemiballismus
Typified by 1 month recovery from hemisensory loss
followed by BRUTAL, intractable PAIN
Thalamic pain syndrome
*Proximal PCA syndrome
transition FROM BS to cortex
*similar to ICA or MCA stroke
indicates involvement where and for what syndrome?
Contralateral hemiplegia from cerebal peduncle involve.
*Proximal PCA syndrome
LOSE ballistic mvmts 1/2 side
typified by flinging, flailing mvmts of ONE extremity
subthalamic nuceli infarct
Hemiballismus
*Proximal PCA syndrome
*Subthalamic nuclei infarct —-THINK PCA
Peripheral PCA syndromes
problems typically_________
discreet
3 Problems associated w/ Peripheral PCA syndromes
- Transiet Global Amnesia due to hippocampal lesion
- Alexia (unable to read) w/out agraphia (still able to write)
- Visual symptoms
What are the visual symptoms assoc’d w/ peripheral PCA syndrome
* cortical blindness—occ. lobe directly affected
* Homonymous hemianopsia–portion of vis. field missing
Vertebral Artery syndromes
Vertebral arteries FORM Basilar aa’s
Anterior BS
see pic
PRIMARY arterial supply to medulla, AND post, inf, Cb
Vertebral artery
what is the Vertebral artery the PRIMARY arterial supply to?
Medulla
Post, Inf Cb
Commonly occluded by atherosclerosis
susceptible to trauma (MVA), OR inappopriate EXT–rot. manipulations
*inapp. C-spine manips
Vertebral aa syndrome
MOST common cause vertebral artery syndromes
Atherosclerosis
also inappropriate manipulations of C/S
Well-documented in Wallenberg’s (Lat. Medulla) Syndrome
Vert. Artery syndrome
Lateral Medullary or
Wallenberg’s Syndrome
Think…
Vertebral artery syndrome
Lateral Medullary Syndrome
*Assoc’d w/ Vertebral artery syndrome
- vertigo
- nausea
- hoarseness
- dysphagia
- Horner’s syndrome
- ipsilateral ataxia
- ipsilateral loss of facial sensation to pain and temp
- ipsilateral loss of sensation on arm, trunk, leg
- Contralateral loss of pain/temp in arm, trunk, leg
3 signs of Horner’s Syndrome
*Lat. Medullary Syndrome
- constricted pupil
- Ptosis (droopy eyelid)
- DEC sweating
IPSILATERAL losses assoc’d w/ Lat. Medullary Syndrome
- IPSILATERAL
- loss facial sensation to pain and temp
- ataxia
- loss of sensation arm, trunk, leg
CONTRALATERAL loss assoc’d w/ Lat. Medullary syndrome
- CONTRALATERAL
- loss of pain/temp arm, trunk, leg
Basilar Artery syndrome
*2 vert aa’s come together to form Basilar aa
Anterior BS
see pic
Basilar artery supplies Central areas:
what are they?
- PONS
- Superior cerebellar peduncles
- portions of Midbrain, Cb, diencephalon
*Central areas
Why can Basilar artery syndrome be catastrophic?
Pontine damage
Basilar aa syndrome can be catastrophic bc of the pontime damage
what happens as a result?
- Tetraplegia
- Coma
- “Locked-in” Syndrome–> Trapped inside your own body
- basically…
- person FEELS conscious, oriented, alert
- NO capacity for motor output
- person FEELS conscious, oriented, alert
- basically…
When Dr. Cohen says “Cerebellum”
you say…….
COORDINATION!!!!!!
Cb is supplied by 3 arteries
what are they?
- 2 branches from Basilar aa
- SCA
- AICA
- 1 branch from Vertebral artery
- PICA
in GROSS terms….
what does the Cb do?
adds precision to mvmt control
very obvious that since the Cb adds precision to mvmt control that it must have a role in _________________ or ______________-
BALANCE
or maint. of postural stability
3 lobes of the Cb
- Anterior
- Middle
- Flocculonodular
Anterior lobe: Cb
Posture
Trunk mvmt
Middle lobe Cb
Coordination
Flocculonodular lobe Cb
Mm tone and Eye mvmt
How is the Cb connected to rest of the brain?
Cerebellar peduncles
Cb receives many ________ projections from the _____, ______, and ________ brain regions
AFFERENT
cord, cortex, subcortical brain reg’s
The Cb receives INPUT from motor and NON-motor areas
4 areas:
- somatosensory
- vestibular
- auditory
- visual