Neurological Disorders (Stroke^J TBI^J Coma)

Logistics

  • Time Change for Course: Important to note any schedule adjustments made for the courses in relation to the exam review timetable.

  • Exam Review: Review preparation strategies to ensure all material is covered adequately and effectively.

  • Annotated Bibliography: Compile sources and references used for research in relation to the exam topics, including proper citations.

Cerebrovascular Accidents (CVAs), Tumors, and Traumatic Brain Injury

  • Overview of the key areas of focus, including understanding cerebrovascular accidents, types of brain tumors, and the repercussions of traumatic brain injuries.

Types of Vascular Defects

  • Anoxia: Refers to a complete absence of oxygen supply, leading to neuronal death (necrosis). Common causes include heart attacks, submersion events, and TBI.

  • Hypoxia: This denotes a reduced, but not complete, oxygenation of the brain, which does not result in cell death. Causes often include high altitude conditions and chronic hypoxia during sleep like sleep apnea.

Strokes

  • Definition: A cerebrovascular accident (CVA) occurs when the brain lacks sufficient blood flow, resulting in brain tissue death.

  • Causes: Strokes can have multifactorial causes and typically affect one of the cerebral hemispheres.

Types of Strokes (Cerebrovascular Accident)

  • Transient Ischemic Attacks (TIAs): Temporary disruptions to blood flow that resolve and patients return to baseline health.

  • Hemorrhagic Stroke: This includes intracerebral strokes, which occur within the brain, and subarachnoid strokes, which happen between the brain's inner and outer coverings.

  • Ischemic Stroke or Infarctions: Caused by inadequate blood supply leading to tissue death, often from thrombosis (blood clot formation within blood vessels) or embolism (a traveling blood clot, often from the heart).

F.A.S.T. Warning Signs (American Stroke Association)

  • F = Face Drooping: Check for asymmetry in the smile.

  • A = Arm Weakness: Observe if one arm drifts downwards when both are raised.

  • S = Speech Difficulty: Listen for slurred speech.

  • T = Time to Call 119: Emphasizes the urgency of seeking medical help immediately when symptoms occur.

The Importance of Timely Action

  • Acting quickly can save lives and improve recovery outcomes. Every minute counts in treating strokes.

Types of Stroke

  • Thrombotic (local ischemic): Often driven by cholesterol factors causing blockages within blood vessels.

  • Overview of the underlying mechanisms leading to both ischemic and hemorrhagic strokes.

Thrombosis - Atherosclerosis

  • Describes pathological processes including plaque formation, platelet activation, and subsequent thrombosis following atherosclerotic changes in blood vessels.

Lacunar Infarctions

  • Common in patients with chronic hypertension and diabetes, lacunar infarctions are small occlusions in the vascular supply that lead to motor and sensory deficits.

Hemorrhagic Strokes

  • Intracerebral Hemorrhage: Bleeding within the brain that results in increased intracranial pressure and irritated tissues due to blood exposure.

  • Types highlighted include intracerebral and subarachnoid hemorrhages.

Aneurysms

  • Defect in the elasticity of blood vessels leading to ballooning that weakens vessel walls, common in areas like the middle cerebral artery.

Arteriovenous Malformation (AVM)

  • Rare condition where arteries and veins connect aberrantly, typically present at birth and frequently found in the brain and spinal cord.

Neuropsychological Impact of CVA

  • Neuropsychological deficits can vary based on the location of the stroke, with anterior circulation issues→ clumsiness and aphasia, and posterior circulation often leading to dizziness and neglect.

Prognostic Indicators for Stroke Recovery

  • Factors influencing recovery include the size of the affected blood vessel, presence of collateral vessels, previous stroke history, and the specific brain areas involved.

Risk Factors for Stroke

  • Demographics: Men, certain ethnicities (especially African-Americans), and lifestyle factors play significant roles.

  • Conditions such as hypertension, high cholesterol, diabetes, and obesity elevate risk.

  • Prevention strategies include moderated alcohol consumption and daily aspirin intake.

Neuropsychological Changes Post Stroke

  • Patients may experience disinhibition, attention deficits, and short-term memory issues, with varied impacts based on the injury's location in the brain.

Medical Interventions for Stroke

  • Interventions include anticoagulants for prevention, and surgical techniques like clipping aneurysms.

Behavioral Changes Following Stroke

  • Behavioral changes can manifest as depressive symptoms or apathy, with emotional responses often not aligning with circumstances. Euphoria may also emerge but is less common.

Summary of Clinical Case Study

  • A summary detailing the patient profile, significant findings, and assessment of conditions leading to a left-sided ischemic stroke.

Tumors

  • Classification of Tumors: Tumors are mass areas of new tissue growth independent of surrounding cells, with varying impacts based on whether they are benign or malignant.

  • Types of Intracranial Tumors: Gliomas are the most common, and the characteristics of benign and malignant types are discussed, highlighting the significance of the tumor's responsiveness to treatment.

Metastatic Brain Cancer

  • Discussion on how cancer spreads to the brain from other body parts, emphasizing the rapid growth of such tumors and poor prognosis due to multiplicity.

Interventions for Cancer

  • Treatment avenues include surgery, chemotherapy, radiation therapy, and immunotherapy aimed at targeting and eliminating cancer cells.

Understanding HIV-Associated Neurocognitive Disorder (HAND)

  • Cognitive deficits associated with HIV are discussed, including assessment tools for diagnosing variations of HAND; prevalence statistics for Jamaica are also provided.

Traumatic Brain Injury & Disorders of Consciousness

  • Top Causes of TBI: Motor vehicle accidents, falls, and assaults are noted as leading causes.

Differences by Demographic Group in TBI Incidence

  • Gender disparities with males showing higher instances of TBI, along with age-related impacts.

Effects of Traumatic Brain Injury

  • Coma duration is indicative of severity, with various cognitive functions impacted depending on injury type. Conversations can elicit behavioral changes often making patients susceptible to further injuries.

Behavioral Assessment of Head Injury

  • Glasgow Coma Scale employed for assessing levels of consciousness following a TBI, with detailed scoring criteria associated with severity and recovery assessment.

Recovering from and Preventing TBI

  • Recovery timeline can extend years with significant improvement often within the first months post-injury; prevention is crucial.

Levels of Consciousness

  1. Minimally Conscious State: some awareness present.

  2. Unresponsive Wakefulness Syndrome (UWS): periods of unresponsiveness.

  3. Coma: complete unresponsiveness to external stimuli.

  4. Brain Death: confirmed absence of brain functions.

Complications of Moderate and Severe Brain Injuries

  • Potential complications of TBI include edema, brain herniation, bleeding, and post-traumatic epilepsy, emphasizing the importance of monitoring and intervention post-injury.

Elements of a Neuropsychology Evaluation

  • Key elements to assess include the location and extent of damage, duration since injury, age, premorbid functioning, and medical health among others influencing rehabilitation strategies.