Cerebral aneurysm management

Cerebral aneurysm management

Cerebral aneurysm management

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🧠 Pathophysiology - Weak Walls, Big Trouble

  • Origin: Congenital weakness at arterial bifurcations, primarily in the Circle of Willis.
    • Defect: Focal absence of internal elastic lamina and thinned tunica media.
  • Growth & Rupture: Governed by the Law of Laplace, $T = (P \times r) / 2h$.
    • As radius ($r$) ↑, wall tension ($T$) ↑, increasing rupture risk.
  • Key Risk Factors:
    • Chronic Hypertension (HTN)
    • Smoking
    • Autosomal Dominant Polycystic Kidney Disease (ADPKD)
    • Connective tissue disorders (Marfan, Ehlers-Danlos)

85-95% of cerebral aneurysms are saccular ("berry") type, most commonly at the Anterior Communicating Artery (ACom) junction.

🤯 Clinical Manifestations - The Worst Headache

  • Classic Presentation: Sudden, explosive "thunderclap" headache, reaching maximum intensity within seconds.
    • Patient often describes it as the "worst headache of my life."
  • Key Associated Symptoms:
    • Nausea/Vomiting
    • Meningismus (nuchal rigidity, photophobia) due to blood in CSF.
    • Loss of consciousness (LOC).
    • Focal deficits (e.g., CN III palsy from PComm aneurysm).
  • ⚠️ Sentinel Headache: A less severe, warning headache may precede rupture by days/weeks in ~30-50% of patients.

⭐ The hallmark of a ruptured aneurysm is a "thunderclap headache" from subarachnoid hemorrhage (SAH).

CT head showing subarachnoid hemorrhage

🧠 Diagnosis - Finding the Bubble

  • Initial Test (Suspected Rupture/SAH):

    • 1st: Non-contrast head CT to detect subarachnoid blood.
    • 2nd (if CT negative, high suspicion): Lumbar Puncture (LP).
  • Localization Imaging (Post-SAH confirmation):

    • CT Angiography (CTA): Rapid, first-line for locating the aneurysm.
    • Digital Subtraction Angiography (DSA): Gold standard; invasive, for definitive diagnosis/planning.

Xanthochromia (yellow CSF from bilirubin) on LP is diagnostic for SAH if the initial CT is negative. It appears 6-12 hours after the bleed.

🧠 Management - To Clip or Coil?

The primary goal is to exclude the aneurysm from circulation to prevent (re)rupture. The choice between open surgery and endovascular methods depends on aneurysm and patient factors.

Cerebral Aneurysm Rerupture: Clipping vs. Coiling

FeatureSurgical ClippingEndovascular Coiling
ApproachOpen craniotomyCatheter-based (femoral a.)
Best ForWide-neck, MCA aneurysmsNarrow-neck, posterior circ.
DurabilityMore durable, ↓ re-bleed↑ Retreatment rate
Risk↑ Peri-procedural risk↓ Peri-procedural risk
Ideal PtYoung, good surgical candidateElderly, poor surgical candidate

💥 Complications - Post-Pop Problems

  • Rebleeding: Highest risk in first 24 hrs. Often fatal. Secure aneurysm early.
  • Cerebral Vasospasm: Onset 3-14 days post-SAH, causing delayed cerebral ischemia (DCI).
    • Prophylaxis: Nimodipine (oral CCB) for all SAH patients.
    • Dx: Transcranial Doppler (TCD), CTA.
  • Hydrocephalus: Blood obstructs arachnoid granulations → communicating hydrocephalus.
  • Hyponatremia: SIADH vs. Cerebral Salt Wasting (CSW).
  • Seizures: Risk is highest initially.

⭐ Vasospasm is the main cause of delayed morbidity/mortality. Its delayed onset (3-14 days) is a classic exam point.

CTA brain showing cerebral vasospasm after SAH

⚡ Biggest Takeaways

  • Ruptured aneurysm presents as a "worst headache of life" (thunderclap headache) from subarachnoid hemorrhage (SAH).
  • Initial diagnosis is a non-contrast CT scan. If negative, a lumbar puncture showing xanthochromia is diagnostic.
  • Cerebral angiography (CTA/MRA/DSA) is required to locate the aneurysm, most commonly at the ACom artery.
  • Nimodipine is essential to prevent vasospasm, a major cause of delayed ischemia (days 3-10 post-SAH).
  • Prevent rebleeding (highest risk <24h) with endovascular coiling or surgical clipping.

Practice Questions: Cerebral aneurysm management

Test your understanding with these related questions

A 21-year-old man presents to the emergency department after sustaining a stab wound to the neck at a local farmer's market. The patient is otherwise healthy and is complaining of pain. The patient is able to offer the history himself. His temperature is 97.6°F (36.4°C), blood pressure is 120/84 mmHg, pulse is 90/min, respirations are 15/min, and oxygen saturation is 98% on room air. Physical exam demonstrates a 3 cm laceration 1 cm inferior to the mastoid process on the right side. The patient's breath sounds are clear and he is protecting his airway. No stridor or difficulty breathing is noted. Which of the following is the most appropriate next step in the management of this patient?

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Flashcards: Cerebral aneurysm management

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Which type of hemorrhoid IS painful? _____

TAP TO REVEAL ANSWER

Which type of hemorrhoid IS painful? _____

External hemorrhoids

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