Hemorrhagic Stroke: Causes and Types

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Questions and Answers

In the context of hemorrhagic stroke pathophysiology, which of the following ionic imbalances most directly contributes to glutamate excitotoxicity following the primary insult?

  • Reduced intracellular sodium concentration impairing action potential propagation
  • Increased extracellular potassium levels leading to neuronal hyperpolarization
  • Diminished chloride influx reducing the efficacy of inhibitory neurotransmission
  • Influx of calcium ions into neurons, triggering apoptotic pathways and neurotransmitter release (correct)

A patient presents with sudden onset of severe headache, nuchal rigidity, and photophobia. Initial CT scan is negative for acute hemorrhage. What is the most appropriate next step in management, considering the high suspicion for subarachnoid hemorrhage (SAH)?

  • Initiate empiric antibiotic therapy for suspected meningitis.
  • Order diffusion-weighted MRI to rule out acute ischemic stroke.
  • Administer intravenous thrombolytics to resolve potential microthrombi.
  • Perform lumbar puncture to evaluate CSF for xanthochromia and elevated opening pressure. (correct)

Which of the following best describes the mechanism by which cerebral amyloid angiopathy (CAA) increases the risk of hemorrhagic stroke?

  • Deposition of amyloid protein in the walls of cerebral blood vessels, weakening them and increasing the risk of rupture. (correct)
  • Induction of chronic inflammation within the brain parenchyma, causing diffuse neuronal damage.
  • Impairment of the blood-brain barrier, leading to increased permeability and edema.
  • Activation of the coagulation cascade, leading to increased thrombus formation.

In the management of a patient with a known ruptured intracranial aneurysm, what is the rationale for administering nimodipine?

<p>To prevent vasospasm and subsequent ischemic injury. (D)</p> Signup and view all the answers

Compared to saccular aneurysms, which of the following characteristics is most commonly associated with fusiform aneurysms?

<p>Linkage to atherosclerosis (B)</p> Signup and view all the answers

A patient with a history of hypertension presents with sudden onset left-sided hemiparesis and a rightward gaze preference. CT scan shows a right basal ganglia hemorrhage. Which vascular structure is most likely implicated?

<p>Middle cerebral artery lenticulostriate branches (A)</p> Signup and view all the answers

What is a key distinction in the pathophysiology of arteriovenous malformations (AVMs) compared to aneurysms in the context of hemorrhagic stroke?

<p>AVMs primarily result from congenital defects, while aneurysms mainly arise from acquired conditions. (B)</p> Signup and view all the answers

In the context of subarachnoid hemorrhage (SAH) secondary to a ruptured aneurysm, which of the following best describes the sequence of events leading to delayed cerebral ischemia (DCI)?

<p>Erythrocytes in the subarachnoid space release vasoconstrictive substances causing vasospasm, leading to impaired microcirculation and DCI. (C)</p> Signup and view all the answers

Consider a patient presenting with a suspected hemorrhagic stroke. If a lumbar puncture is performed, which of the following findings would be most indicative of a subarachnoid hemorrhage (SAH) rather than a traumatic tap?

<p>Xanthochromia in the supernatant fluid after centrifugation. (C)</p> Signup and view all the answers

Which of the following is the most appropriate initial blood pressure management strategy in a patient presenting with acute intracerebral hemorrhage (ICH) and a systolic blood pressure of 200 mmHg, assuming no contraindications?

<p>Maintain systolic blood pressure between 150-160 mmHg using intravenous antihypertensive agents. (A)</p> Signup and view all the answers

Following endovascular coiling of a ruptured intracranial aneurysm, a patient develops worsening neurological deficits. Angiography reveals significant vasospasm in the adjacent arteries. Which of the following interventions is most appropriate to improve cerebral perfusion?

<p>Induced hypertension with vasopressors to increase cerebral blood flow. (D)</p> Signup and view all the answers

In the context of managing increased intracranial pressure (ICP) following a hemorrhagic stroke, which of the following statements concerning the use of hyperosmolar therapy is most accurate?

<p>The primary mechanism of action of both mannitol and hypertonic saline is to draw fluid from the intracellular space into the intravascular space, reducing cerebral edema. (D)</p> Signup and view all the answers

A 30-year-old patient presents with a first-time seizure and a subsequent CT scan reveals a small intracerebral hemorrhage. Further evaluation with MRI and angiography identifies an arteriovenous malformation (AVM). What is the most crucial factor in determining the optimal management strategy (observation, surgical resection, embolization, or stereotactic radiosurgery)?

<p>The AVM’s location, size, and angioarchitecture, along with the presence of any associated aneurysms or venous outflow obstruction. (C)</p> Signup and view all the answers

During the acute phase of subarachnoid hemorrhage (SAH), what is the primary rationale for close monitoring of serum sodium levels?

<p>To detect and manage cerebral salt wasting (CSW) or syndrome of inappropriate antidiuretic hormone secretion (SIADH). (A)</p> Signup and view all the answers

In the context of hemorrhagic stroke prognosis, which of the following is the single most potent predictor of long-term functional outcome?

<p>Volume of the hematoma and presence of intraventricular extension (C)</p> Signup and view all the answers

What critical distinction differentiates the diagnostic approach to a suspected subarachnoid hemorrhage (SAH) from that of an acute ischemic stroke?

<p>SAH diagnosis often involves lumbar puncture if initial CT is negative, an approach not typically used in acute ischemic stroke. (A)</p> Signup and view all the answers

Which statement best describes the role of cerebral angiography in the context of acute hemorrhagic stroke management?

<p>It is used to evaluate for underlying structural lesions such as aneurysms or arteriovenous malformations. (A)</p> Signup and view all the answers

In the context of intracranial aneurysm management, what is the key advantage of flow diverters compared to traditional endovascular coiling?

<p>Flow diverters promote vessel reconstruction, reducing the risk of aneurysm recurrence. (A)</p> Signup and view all the answers

Which of the following is a crucial consideration when deciding between surgical clipping and endovascular coiling for the treatment of a ruptured intracranial aneurysm?

<p>Aneurysm location, morphology, and neck width, as well as the availability of experienced surgeons and interventionalists. (A)</p> Signup and view all the answers

What is the most significant limitation of using a stroke risk scorecard for primary prevention of hemorrhagic stroke?

<p>Stroke risk scorecards do not accurately reflect the risk of intracerebral hemorrhage specifically. (A)</p> Signup and view all the answers

A patient with a history of poorly controlled hypertension presents with an acute intracerebral hemorrhage. Beyond blood pressure control, what is the most crucial next step to prevent hematoma expansion?

<p>Reversal of any antithrombotic medications and management of coagulopathies. (A)</p> Signup and view all the answers

What is the primary reason for avoiding activities that increase intracranial pressure (ICP) in patients with hemorrhagic stroke?

<p>To minimize the risk of re-bleeding and further neurological damage. (B)</p> Signup and view all the answers

A patient is diagnosed with cerebral amyloid angiopathy (CAA) after presenting with recurrent lobar hemorrhages. What is the most effective long-term strategy to reduce the risk of future bleeds?

<p>Strict avoidance of antithrombotic medications and careful blood pressure management. (D)</p> Signup and view all the answers

What is the key mechanism by which intraventricular hemorrhage (IVH) contributes to worse outcomes in patients with hemorrhagic stroke?

<p>Obstruction of CSF flow, leading to hydrocephalus and increased intracranial pressure. (A)</p> Signup and view all the answers

Which of the following best describes the role of early rehabilitation therapy in the medical management of hemorrhagic stroke?

<p>To maximize functional recovery and prevent complications such as contractures and muscle atrophy. (C)</p> Signup and view all the answers

What is the most critical factor in determining whether to perform a craniotomy for hematoma evacuation in a patient with intracerebral hemorrhage?

<p>The hematoma location, size, and presence of mass effect causing neurological decline. (D)</p> Signup and view all the answers

Which of the following statements about mannitol and hypertonic saline in the management of increased intracranial pressure (ICP) following hemorrhagic stroke is most accurate?

<p>Both mannitol and hypertonic saline increase serum osmolality, drawing fluid from the brain parenchyma. (B)</p> Signup and view all the answers

Which of the following is the best approach to prevent complications in the immediate treatment of hemorrhagic stroke in the hospital?

<p>Closely monitoring the patient in the ICU. (D)</p> Signup and view all the answers

A patient with a known arteriovenous malformation (AVM) presents with a seizure. What is the most important consideration in their immediate management?

<p>Determining the underlying cause of the seizure and assessing the risk of hemorrhage. (C)</p> Signup and view all the answers

What is the main purpose of placing a patient in the ICU after a hemorrhagic stroke?

<p>To have skilled nurses and frequent monitoring. (B)</p> Signup and view all the answers

Which of the following is the most important consideration when controlling blood pressure in a patient with acute hemorrhagic stroke?

<p>Maintaining adequate cerebral perfusion pressure. (C)</p> Signup and view all the answers

Which of the following best describes the clinical significance of nuchal rigidity in the context of suspected subarachnoid hemorrhage (SAH)?

<p>It suggests meningeal irritation from blood in the subarachnoid space. (D)</p> Signup and view all the answers

What is the primary advantage of using flow-diverter stents in the treatment of certain intracranial aneurysms compared to traditional coil embolization?

<p>Flow-diverter stents provide a scaffold for the aneurysm to shrink. Over time, they also result in the parent artery remodeling. (C)</p> Signup and view all the answers

In the management of cerebral vasospasm following subarachnoid hemorrhage, which of the following statements regarding the use of transluminal angioplasty is most accurate?

<p>It is generally reserved for patients who do not respond to medical management with induced hypertension and nimodipine. (A)</p> Signup and view all the answers

A patient with a known arteriovenous malformation (AVM) presents with a sudden, severe headache and altered mental status. CT scan reveals acute hemorrhage. What is the most critical immediate consideration in managing this patient?

<p>Determining the feasibility of surgical resection or endovascular embolization of the AVM. (D)</p> Signup and view all the answers

Which of the following is the most accurate description of the role of lumbar puncture in the diagnostic workup of subarachnoid hemorrhage (SAH)?

<p>Lumbar puncture is indicated if the CT scan is negative for blood but SAH is still clinically suspected. (A)</p> Signup and view all the answers

Which of the following antihypertensive agents is generally preferred for acute blood pressure control in a patient with intracerebral hemorrhage?

<p>Intravenous labetalol or nicardipine due to their titratability and avoidance of cerebral vasodilation. (A)</p> Signup and view all the answers

Following the rupture and successful endovascular treatment of an anterior communicating artery aneurysm, a patient develops new-onset lower extremity weakness and urinary incontinence. What complication is most likely?

<p>Vasospasm of the anterior cerebral artery territory. (B)</p> Signup and view all the answers

In the context of arteriovenous malformations (AVMs), what is the primary rationale for considering treatment, even in asymptomatic patients?

<p>To reduce the risk of future hemorrhage and associated neurological deficits. (C)</p> Signup and view all the answers

Flashcards

Hemorrhagic Stroke

Occurs when a blood vessel bursts inside the brain, leading to bleeding and potential damage.

Cerebral Aneurysm

A bulge in the wall of a cerebral artery that can rupture and cause a hemorrhagic stroke.

Arteriovenous Malformation (AVM)

Abnormal connections between arteries and veins in the brain, bypassing the capillary bed, which can lead to hemorrhage.

Subarachnoid Hemorrhage

Bleeding into the space between the brain and the surrounding membrane (subarachnoid space).

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Intracerebral Hemorrhage

Bleeding directly into the brain tissue.

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Saccular Aneurysm

Rounded berrylike outpouchings that arise from arterial bifurcation points.

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Fusiform Aneurysm

A spindle-shaped aneurysm; also known as atherosclerotic aneurysm

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Circle of Willis

The arterial circle at the base of the brain where aneurysms often occur.

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Ligation or Clipping

A procedure to surgically block off the aneurysm to prevent rupture.

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Flow-diverter mesh stent

A mesh tube placed inside the artery to reduce blood flow to an aneurysm, causing it to clot off and shrink.

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Uncontrolled Hypertension

Elevated blood pressure, a major risk factor for hemorrhagic stroke.

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Cerebral Angiography

A diagnostic test to visualize blood vessels in the brain.

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Lumbar Puncture

Removal of cerebrospinal fluid for analysis.

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Cerebral Hypoxia

Reduced oxygen supply to the brain.

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Cerebral Vasospasm

Spasm of the cerebral blood vessels, reducing blood flow.

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Antihypertensive Therapy

Therapy to lower high blood pressure.

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Craniotomy

A surgical procedure where a piece of the skull is removed.

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Study Notes

Hemorrhagic stroke occurs when a blood vessel bursts inside the brain.

Factors that Contribute to Hemorrhagic Stroke:

  • Uncontrolled high blood pressure
  • Aneurysms
  • Arteriovenous malformation (AVM)
  • Metastatic cancer
  • Cerebral amyloid angiopathy (CAA)
  • Certain conditions or medications

AV (Arteriovenous) Malformation:

  • AVM causes blood to pass quickly from artery to vein
  • It skips the normal capillary network.
  • Typically caused by abnormality in embryonic development
  • This leads to a tangle of arteries and veins in the brain that lacks a capillary bed.
  • AVM is a common cause of hemorrhagic stroke in young people.

Forms of Hemorrhagic Stroke:

  • Include intracerebral hemorrhage and subarachnoid hemorrhage

Intracerebral Hemorrhage:

  • Most common in patients with hypertension and cerebral atherosclerosis
  • Bleeding most commonly occurs in the cerebral lobes, basal ganglia, thalamus, brainstem, and cerebellum.

Intracranial (Cerebral) Aneurysm:

  • Dilation or ballooning of the walls of a cerebral artery
  • Tends to increase in size, causing pressure against adjacent CNS tissue
  • There is danger of rupture.
  • Cause is unknown
  • Onset is usually sudden and without warning.

Precipitating/Predisposing Factors for Intracranial Aneurysms:

  • Atherosclerosis
  • Congenital defect of the vessel wall
  • Hypertensive vascular disease
  • Head trauma
  • Advancing age

Classification of Aneurysms:

  • Saccular aneurysms are rounded, berry-like outpouchings that arise from arterial bifurcation points.
  • Fusiform aneurysms are spindle-shaped aka atherosclerotic aneurysms.

Location of Aneurysms:

  • Any artery within the brain can be the site of aneurysm
  • Occurs at the bifurcations of the large arteries at the Circle of Willis
  • The most commonly affected arteries include:
    • Internal carotid artery (ICA)
    • Anterior cerebral artery (ACA)
    • Anterior communicating artery (ACoA)
    • Posterior communicating artery (PCoA)
    • Posterior cerebral artery (PCA)
    • Middle cerebral artery (MCA)

Surgical Interventions for Aneurysms:

  • Ligation or clipping of the aneurysm
  • Flow-diverter mesh stent can be placed inside the artery
  • This reduces blood flow from entering the aneurysm and will eventually clot off and shrink.

Subarachnoid Hemorrhage:

  • Hemorrhage into the subarachnoid space
  • May occur as a result of an AVM, intracranial aneurysm, trauma, or hypertension.

Pathophysiology of Hemorrhagic Stroke:

  • Cerebral aneurysm or AVM ruptures, leading to hemorrhage into the cranial subarachnoid space
  • Disrupting normal brain metabolism due to the brain's exposure to blood and an increase in ICP
  • Ultimately causing compression and injury to brain tissue, vasospasm, and ischemia to the brain.

Clinical Manifestations of Hemorrhagic Stroke:

  • Neurologic deficits like in ischemic stroke
  • Motor, sensory, cranial nerve, and cognitive loss
  • Severe headache and vomiting
  • Early and sudden change in LOC
  • Seizures due to frequent brain stem involvement
  • Aneurysm/AVM causes sudden, unusually severe headache and LOC
  • There may be variable period of time with pain and nuchal rigidity
  • Visual disturbances such as tinnitus, dizziness, and hemiparesis
  • Severe bleeding followed rapidly by coma and death.

Prognosis of Hemorrhagic Stroke:

  • Depends on the neurologic condition of the patient including:
    • Age
    • Associated diseases
    • Extent and location of the hemorrhage or intracranial aneurysm

Diagnostic Tests for Hemorrhagic Stroke:

  • Computed Tomography (CT) scan
  • Magnetic Resonance Imaging (MRI)
  • Cerebral angiography
  • Lumbar puncture
  • Other tests include CBC, PT, PTT, and CSF exam.

Prevention of Hemorrhagic Stroke:

  • Primary prevention involves managing hypertension and other risk factors.
  • Stroke risk screening

Complications of Hemorrhagic Stroke:

  • Cerebral hypoxia and decreased blood flow to area of injury
  • Cerebral vasospasm with increased vascular resistance, intensified headaches, and decreased LOC
  • Increased intracranial pressure
  • Hypertension leads to the most common cause of intracerebral hemorrhage
  • Antihypertensive therapy may include nicardipine, nitroprusside, or hydralazine
  • Hydrocephalus and re-bleeding

Medical Management for Hemorrhagic Stroke:

  • The goals of treatment include:
    • Saving said person's life
    • Relieving symptoms
    • Repairing the cause of bleeding
    • Preventing complications
    • Starting rehabilitation therapy as soon as possible
  • Craniotomy may be necessary.
  • Immediate treatment in the hospital involves placing the patient in the ICU and close monitoring.
  • Careful attention should be paid towards breathing and BP should be carefully controlled.
  • Administer drugs to control brain swelling and medications for headaches.
  • Seizure medications, rest in bed, and avoiding activities that may increase ICP and provide nutrients and fluids.

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