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Stroke Syndromes. Dr. Meg- angela Christi Amores. Stroke. Cerebrovascular disease ischemic stroke, hemorrhagic stroke, and cerebrovascular anomalies such as intracranial aneurysms and arteriovenous malformations (AVMs) Stroke

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stroke syndromes

Stroke Syndromes

Dr. Meg-angela Christi Amores

  • Cerebrovascular disease
      • ischemic stroke, hemorrhagic stroke, and cerebrovascular anomalies such as intracranial aneurysms and arteriovenous malformations (AVMs)
  • Stroke
      • abrupt onset of a neurologic deficit that is attributable to a focal vascular cause
      • Ischemic or hemorrhagic
  • Ischemic Stroke
      • Acute occlusion of an intracranial vessel causes reduction in blood flow to the brain region it supplies
      • A fall in cerebral blood flow to zero causes death of brain tissue within 4–10 min
      • values <16–18 mL/100 g tissue per min cause infarction within an hour
      • values <20 mL/100 g tissue per min cause ischemia without infarction unless prolonged for several hours or days
ischemic stroke
Ischemic stroke
  • Ischemic penumbra
      • Tissue surrounding the core region of infarction that is ischemic but reversibly dysfunctional
      • will eventually infarct if no change in flow occurs
  • Fever dramatically worsens ischemia, as does hyperglycemia[glucose > 11.1 mmol/L (200 mg/dL)], so it is reasonable to suppress fever and prevent hyperglycemia as much as possible
ischemic stroke1
Ischemic Stroke
  • Pathophysiology
      • 1) occlusion of an intracranial vessel by an embolus that arises at a distant site
      • (2) in situ thrombosis of an intracranial vessel, typically affecting the small penetrating arteries that arise from the major intracranial arteries
      • (3) hypoperfusion caused by flow-limiting stenosis of a major extracranial
stroke syndromes1
Stroke Syndromes
  • Patient presentation can localized area of the brain affected/ blood vessel occluded
  • Divided into:
    • (1) large-vessel stroke within the anterior circulation
    • (2) large-vessel stroke within the posterior circulation
    • (3) small-vessel disease of either vascular bed
middle cerebral artery1
Middle Cerebral Artery
  • If occluded at its origin:
    • contralateralhemiplegia
    • Hemianesthesia
    • homonymous hemianopia
    • gaze preference to the ipsilateral side
    • If dominant hemisphere: global aphasia
    • If non-dominant hemisphere: anosognosia, constructional apraxia, and neglect
middle cerebral artery2
Middle Cerebral Artery
  • Somatic motor area for face and arm and the fibers descending from the leg area to enter the corona radiata and corresponding somatic sensory system
      • Paralysis of the contralateral face, arm, and leg;
      • sensory impairment over the same area (pinprick, cotton touch, vibration, position, two-point discrimination, stereognosis, tactile localization, barognosis, cutaneographia)
middle cerebral artery4
Middle Cerebral Artery
  • Motor aphasia: Motor speech area of the dominant hemisphere
  • Central aphasia, word deafness, anomia, jargon speech, sensory agraphia, acalculia, alexia, finger agnosia, right-left confusion (the last four comprise the Gerstmann syndrome): Central, suprasylvian speech area and parietooccipital cortex of the dominant hemisphere
  • Conduction aphasia: Central speech area (parietal operculum)
middle cerebral artery5
Middle Cerebral Artery
  • Homonymous hemianopia (often homonymous inferior quadrantanopia): Optic radiation deep to second temporal convolution
  • Paralysis of conjugate gaze to the opposite side: Frontal contraversive eye field or projecting fibers
anterior cerebral artery2
Anterior Cerebral Artery
  • anterior limb of the internal capsule, the anterior perforate substance, amygdala, anterior hypothalamus, and the inferior part of the head of the caudate nucleus
  • Occlusion of the proximal ACA is usually well tolerated because of collateral flow through the anterior communicating artery and collaterals through the MCA and PCA
anterior cerebral artery3
Anterior Cerebral Artery
  • Paralysis of opposite foot and leg: Motor leg area
  • A lesser degree of paresis of opposite arm: Arm area of cortex or fibers descending to corona radiata
  • Cortical sensory loss over toes, foot, and leg: Sensory area for foot and leg
  • Urinary incontinence: Sensorimotor area in paracentral lobule
anterior cerebral artery5
Anterior Cerebral Artery
  • Abulia (akineticmutism), slowness, delay, intermittent interruption, lack of spontaneity, whispering, reflex distraction to sights and sounds: Uncertain localization—probably cingulategyrus and medial inferior portion of frontal, parietal, and temporal lobes
  • Impairment of gait and stance (gait apraxia): Frontal cortex near leg motor area
  • Dyspraxia of left limbs, tactile aphasia in left limbs: Corpus callosum
stroke within the posterior circulation
Stroke within the Posterior Circulation
  • Posterior Cerebral Artery
    • result from atheroma formation or emboli that lodge at the top of the basilar artery
posterior cerebral artery
Posterior Cerebral Artery
  • P1 Syndromes
      • third nerve palsy with contralateral ataxia (Claude\'s syndrome) or with contralateralhemiplegia (Weber\'s syndrome)
      • contralateralhemiballismus (if subthalamic n)
      • thalamic Déjerine-Roussy syndrome - contralateralhemisensory loss followed later by an agonizing, searing or burning pain in the affected areas
posterior cerebral artery1
Posterior Cerebral Artery
  • P2 Syndromes
      • infarction of the medial temporal and occipital lobes
      • Contralateral homonymous hemianopia with macula sparing
      • acute disturbance in memory (hippocampus)
      • peduncularhallucinosis - visual hallucinations of brightly colored scenes and objects
      • infarction in the distal PCAs produces cortical blindness
      • Anton\'s syndrome – unaware of blindness and in denial
basilar artery
Basilar Artery
  • Complete basilar occlusion :
      • a constellation of bilateral long tract signs (sensory and motor) with signs of cranial nerve and cerebellar dysfunction
  • “locked-in" state of preserved consciousness with quadriplegia and cranial nerve signs suggests complete pontine and lower midbrain infarction
  • CT Scan
      • identify or exclude hemorrhage as the cause of stroke
      • the infarct may not be seen reliably for 24–48 h
      • may fail to show small ischemic strokes in the posterior fossa
  • MRI
      • reliably documents the extent and location of infarction in all areas of the brain
      • less sensitive than CT for detecting acute blood
  • Cerebral Angiography
      • "gold standard" for identifying and quantifying atherosclerotic stenoses of the cerebral arteries
      • used to deploy stents within delicate intracranial vessels
      • intraarterial delivery of thrombolytic agents
primary and secondary prevention
Primary and Secondary Prevention
  • General Principles
      • medical and surgical interventions
      • lifestyle modifications
      • Evaluation of a patient\'s clinical risk profile
  • Atherosclerosis risk factors
      • Older age, family history of thrombotic stroke, diabetes mellitus, hypertension, tobacco smoking, abnormal blood cholesterol [particularly, low high-density lipoprotein (HDL) and/or high low-density lipoprotein (LDL)
primary and secondary prevention1
Primary and Secondary Prevention
  • Antiplatelet Agents
      • inhibiting the formation of intraarterial platelet aggregates
      • Aspirin, clopidogrel, and the combination of aspirin plus extended-release dipyridamole
      • Aspirin dose: 50–325 mg/d
  • Anticoagulation
      • For AF patients: Warfarin