Overview of Stroke
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Transcript of Overview of Stroke
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Overview of StrokeCerebral Infarction
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A Case: Chief Complaint• 34 year old female presented to a
community hospital with abnormal language. Her husband reported that she had been normal 2 hours earlier at which time the patient is said to have demonstrated shaking of the arms and legs for several seconds of duration. Immediately thereafter the patient was unable to speak and there was paucity of movement on the right side of the body. There was no report of urinary or bowel incontinence and no report of tongue biting.
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The Previous Medical History• Migraine Headaches• Frequent Urinary Tract Infections• Multiple episodes of epistaxis• Depression• Miscarriage
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Current Medications• Venlafaxine, An antidepressive
medication. Works by inhibiting the re-uptake of serotonin, noradrenalin, and dopamine.
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Social History• Married • Four living children. G5P5014• Does not smoke. No history of
tobacco use.• No history of recreational or illicit
drug use.• No history of alcohol abuse.• No recent travel abroad.
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Stroke Epidemiology• First…………..180,000• Recurrent…….600,000• Incidence…….780,000/yr =1stk/40s• Prevalence…..6,500,000• Males…………2,600,000• Female……….3,900,000 •
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Stroke Mortality• 3rd Leading Cause of Death in USA• 150,000 Deaths Yearly• One of Every 17 Deaths in 2005• 56,586 Males• 86,993 Females• Death Rate Declined in 2005 i.e.
29.7% to 13.5%
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Stroke Morbidity• Leading cause of long term disability• 30% of survivors require assistance
with ADL ( activities of daily living)• 20% require assistance to ambulate• 16% must be institutionalized.• Health care and lost income cost
approach $41 billion
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Stroke by Definition:• An acute on set of neurologic
dysfunction caused by impairment of blood flow the region of brain mapping to the impaired function.
• Manifest on Brain imaging.• Dysfunction last 24 hours.• If < 24 hours and no signature on
brain image: TIA (transient ischemic attack
• 0
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Classification of Strokes• Hemorrhagic• 15-25 %• ICH• SDH• EDH
• Ischemic• 71- 83 %• Embolic • Cardiac Source• Non-cardiac Source
• Large Vessel Disease
• Small Vessel Disease
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Ischemic Stroke Subtypes• Large Vessel• Small Vessel• Embolic (usually Cardioembolic)• Thrombotic (usually from Atherosclerotic
Cerebrovascular Disease)• Microangiopathic Brain Disease• Cortical• Subcortical
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The Cerebral Circulation
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Cardiac Related Stroke• Atrial Fibrillation• Cardiac Valve disease• MI (wall motion abnormality)• Septal Aneurysms• Patent Foramen Ovale• Atrial Septal Defect• Dilated Cardiomyopathy
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Risk Factors• Hypertension• Heart Disease• Atrial fibrillation• Diabetes• Tobacco• Lipids• Abnormal
hematology• OSA
• Age• Race/ethnicity• Gender• Family history• genotype
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CONGENITAL HYPERCOAGULABLE CONDITIONS
• Factor 5 Leiden mutation• G2021A mutation• Antithrombin 3• Protein C deficiency• Protein S deficiency
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Inherited Disorders• Homocystinuria• Fabry’s Disease• Marfan’s Syndrome• Rendu-Osler-Weber Syndrome
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34 year old female :Physical Examination
• VS: 98.6, 116/71, 23/min, 106/min• Oxygen Saturation 97%, room air• Mute, + commands, neck supple, no
bruits, fast RR (-)MRG, clear lungs, abd: benign, extremities: no CCE.
• ® Arm>>® Leg Weakness, ® face weakness, (left side normal), Deep Tendon Reflexes absent on the ®, Plantar Response: Up on the ® and Down on the left. Sensation: Normal.
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Case laboratory studies• Serum glucose….106• Sodium…………..142• Creatinine………...0.7• WBC………………11,900/cu mm• Platelet count……..258000/cu mm• Hemacrit……….....42%• PT………………….12.9 sec• PTT…………………34.5 sec
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Computed Tomography of the Head• Arrival to ER, Airway, Breathing,
Circulation, then…• Head CT is crucial in the management of
the stroke patient.• The study distinguishes hemorrhagic
strokes from ischemic strokes.• The HCT may or may not provide
additional diagnostic information• Diffusion weighted MRI: better stroke
detection in the first 12 hours.
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Easter JS et al. N J Med 2010;362:2114-2120.
34 yo female• Dense MCA Sign
Head CTPerformed 3.5 hours past the onset of stroke symptoms
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CT: Thrombosis in the Left Middle Cerebral Artery• Sources of emboli to the brain
Carotid AtherosclerosisCarotid DissectionIntracranial VasculopathyAtrial FibrillationCardiac Valve DiseaseRight-to-Left Cardiac ShuntHypercoagulable States
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Acute Therapy• Intravenous TPA within 4.5 hrs. of
onset• Intra-arterial Thrombolysis within 6
hrs. of onset• Mechanical Embolectomy
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Case Patient Acute Therapy
• Intravenous Heparin was started.• Patient transferred to tertiary care
hospital.• Neurological examination worsened.• Required intubation (protect airway.)• CT angiogram performed.
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CT Angiogram of the BrainFilling defect noted in left middle
cerebral artery
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Case Acute Care Continues
• Intra-arterial TPA was administered.• Endovascular mechanical retrieval
of clot was performed.• Flow through left MCA was restored.• Right hemiparesis persisted.• Chest x-ray read as right middle
lobe pneumonia.• Antibiotic started: patient to ICU.
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Chest X-RayEndotracheal Tube is in place. Right middle
lobe infiltrate. Aspiration pneumonia? Or something else?
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Additional Studies• Echocardiogram: Suggested Atrial
septal defect.• Hypercoagulopathy screen was
negative.• Lower extremity venous ultrasound
was negative.• Neck CT angiogram negative for
dissection.
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Putting It All Together• Young female with stroke.• Likely an embolic stroke.• History of nose bleed.• History of miscarriage• Family History of AVM.• Abnormal chest x-ray.• Could be consistent with hereditary
hemorrhagic telangiectasia.• Chest CT: Hunt for pulmonary AVM
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Contrast CT of the ChestCT Scan of the Torso Obtained 1 Week after Admission. The coronal-plane–formatted CT scan shows an arteriovenous malformation in the lung (arrow).
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Cause of this Stroke• Most probably paradoxical through
the intrapulmonary shunt created by the pulmonary arteriovenous malformation.
• Pulmonary AVM is part and parcel of Rendu-Osler-Weber Syndrome i.e. HHT.
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Rendu-Osler-Weber Syndrome• Autosomal Dominant• Telangiectasia of skin mucous
membrane, various organs.• Two different Gene Loci identified (a)
9q33-34 and (b) 12q13• Arises from spontaneous mutations
in 30% of cases.
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Neurologic Manifestations of HHT• Headache• Dizziness• Seizure• Paradoxical Embolism Stroke• Transient Ischemic Attacks• ICH, SAH• Meningitis• Cerebral abscess
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Treatment of HHT• Manage the complications. Notably,
our patient walked out of the hospital with improved speech and language.
• Early resection of lung AVM or embolization of the fistula.
• Periodic Transfusion and Iron Therapy
• ASA has been used for platelet sequestration.
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