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Published on : Aug 18, 2021 | Views : 1925 | Downloads : 10

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SELECTED GERIATRIC NEUROLOGIC DISEASE Module 3 Stroke and TIA’s Bill Lyons, M.D. UNMC Geriatrics Asst. Professor wlyons@unmc.edu
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Objectives Re: Stroke and TIA, upon completion the learner will be able to: Lists the etiologies Describe the diagnostic features Described the evaluation and management.
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STROKE Abrupt neurologic deficit #3 cause of death in US, #1 cause of disability
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STROKE Older age Increases risk of death from stroke Risk factor for recurrence Predictors of long-term outcome: Severity of symptoms at presentation Age
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OTHER PREDICTORS OF BAD OUTCOMES Cardioembolic worse than lacunar Thrombosis of: basilar artery, intracranial ICA, or MCA Hyperglycemia (even if not diabetic)
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ISCHEMIC STROKES About 70-80% of all strokes Arterial diseases – atherosclerosis, rarely arterial dissection Embolism – atrial fibrillation, aortic arch, carotid a., vertebral a., basilar a. Hypertension – lipohyalinotic thickening Hypoperfusion – watershed infarcts Prothrombotic states – including HRT
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HEMORRHAGIC STROKES About 20-30% of strokes Hypertension Vascular lesions (AVMs, aneurysms, amyloid angiopathy, vasculitis) Coagulopathy Hemorrhagic transformation of ischemic CVA Bleed into tumor
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CLINICAL FINDINGS Sudden neurologic deficit Motor, sensory, visual, coordination, cognitive, sensorium, language May see seizures at onset, or nausea/vomiting Sudden, severe headache in SAH or ICH
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VERTEBROBASILAR DISEASE Dizziness or vertigo Headache, vomiting, diplopia Vision loss Ataxia Bilateral numbness/weakness Top-of-the-Basilar: somnolence/stupor, inability to form new memories, poorly reactive pupils, vertical gaze deficits
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IMAGING, OTHER STUDIES Urgent neuroimaging (CT, MRI) essential Small minority (~5%) acute ischemic strokes visible on CT in <12 hrs MRI better sensitivity Suggestion of embolic disease Suspicious: multiple infarcts, different territories ECG, echocardiography, rhythm monitoring
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DIFFERENTIAL DIAGNOSIS OF STROKE Postictal (Todd’s paralysis) Subdural or epidural hematoma Metabolic (hypoglycemic!) or hypoxic encephalopathy Brain tumor (primary or metastatic) Brain abscess
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DIFFERENTIAL, cont’d Encephalitis Migraine Multiple sclerosis Psychogenic
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STROKE COMPLICATIONS Functional loss from motor, sensory, coordination deficits Cognitive loss, dementia Seizure disorder Depression (affects 25-40% in first year) Aspiration (esp from dysphagia, altered LOC) DVT, contractures, pressure ulcers UTIs (esp if bladder catheters used)
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STROKE TREATMENT Acute stroke units shown to improve outcomes in ischemic strokes (death, disability, need for institutionalization)
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STROKE TREATMENT, cont’d NPO until safe swallowing (IVF instead) DVT prophylaxis Monitor BP, don’t rapidly reduce PT, OT, SLP consultations
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STROKE TREATMENT, cont’d Determine stroke subtype by neuroimaging Thrombolytic or antithrombotic treatment contraindicated in hemorrhagic stroke Thrombolysis Improved outcomes in acute ischemic CVA if treated within 3 hrs symptom onset Contraindications: bleeding diathesis, surgery, etc Advanced age increases risk of intracerebral bleed
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SECONDARY PREVENTION Cardioembolic – oral anticoagulation Ischemic, noncardioembolic – antiplatelet agents Stenosis of ipsilateral carotid artery Probable benefit from CEA if >50% stenosis Benefits more pronounced if over 70% stenosis Manage htn, DM, dyslipidemia, smoking
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TRANSIENT ISCHEMIC ATTACK Classic definition: Sudden deficit lasting <24 hrs Vascular origin, in area perfused by specific artery TIA Working Group alternate definition
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TIA, cont’d Important to identify and treat! After first TIA, 10-20% have stroke in next 90 days, half of which occur within 1-2 days of TIA Predictors of greater stroke risk: advanced age, diabetes, symptoms lasting >10 min, weakness, impaired speech Need urgent brain imaging
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TIA TREATMENT Atrial fibrillation – anticoagulation Noncardioembolic cause – antiplatelet therapy Carotid disease CEA for good surgical candidates, 70-99% stenosis, and TIA in previous 2 years Consider CEA for 50-69% stenosis Risk factors: htn, DM, lipids, smoking….
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Post-test question one Consider the case of a 90-year-old woman with diabetes, congestive heart failure, and mild Alzheimer's disease, who presents to the emergency department. She experienced a sudden episode of weakness involving her right arm and leg, along with difficulty "getting her words out." The entire episode lasted about 15 minutes, and it occurred about 2 hours before her arrival at the emergency department. A head CT obtained shortly after her arrival in the ED shows only atrophy consistent with her age. All of the following statements regarding this patient are correct except: The head CT result rules out ischemic stroke The patient's advanced age increases her risk of stroke in the near term The patient's symptom duration increases her risk of stroke in the near term Her impaired speech increases her risk of stroke in the near term
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Correct Answer: A. The head CT result rules out ischemic stroke Feedback: The answer is (a). The head CT was obtained only 2 to 3 hours after her acute neurologic event. Remember that only 5% of acute ischemic strokes are readily appreciated on CT in the first 12 hours, so her "negative" head CT does not rule this out. The other answers are all true statements, since, in the setting of TIA, advanced age, symptoms lasting over 10 minutes, and impaired speech are all risk factors for suffering a stroke after a TIA. End
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REFERENCES Aminoff MJ. Nervous System. Chapter 24 in: Tierney LM Jr, McPhee SJ, Papadakis MA. Current Medical Diagnosis and Treatment, 43rd Edition, 2004. McGraw-Hill, NY. Carey E, Adler J. Parkinson’s Disease and Essential Tremor. Chapter 13 in: Landefeld CS et al. Current Geriatric Diagnosis and Treatment. McGraw-Hill, New York, 2004. Siderowf A, Stern M. Ann Intern Med 2003;138:651-658. Rao G et al. JAMA 2003;289:347-353.
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REFERENCES, cont’d Stacy M. Progressive Supranuclear Palsy. Chapter 16 in: Adler CH, Ahlskog JE. Parkinson’s Disease and Movement Disorders. Humana Press, Totowa, NJ, 2000. Leira EC, Adams HP. Cerebrovascular Disease. Chapter 18 in: Landefeld CS et al. Current Geriatric Diagnosis and Treatment. McGraw-Hill, New York, 2004. Weinberger J. Clinical Geriatrics 2004;12:48-54. Dobkin BH. N Engl J Med 2005;352:1677-1684. Flint AC, Smith WS. Stroke Rounds 2004;10(2).
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REFERENCES, cont’d Savitz SI, Caplan LR. N Engl J Med 2005;352:2618-2626. Albers GW et al for the TIA Working Group. N Engl J Med 2002;347(21):1713-1716. Johnston SC. N Engl J Med 2002;347(21):1687-1692. Castillo J et al. Stroke 2004;35:520-527.