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Related Experiment Videos

["Paradoxical" herniation after decompressive trephining]

S Schwab1, F Erbguth, A Aschoff

  • 1Klinik für Neurologie, Universität Heidelberg.

Der Nervenarzt
|December 3, 1998
PubMed
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Decompressive craniectomy can lead to reversible brain herniation due to pressure differences. Lumbar puncture should be avoided or performed carefully in these patients to prevent herniation.

Area of Science:

  • Neurology
  • Neurosurgery
  • Critical Care Medicine

Background:

  • The brain's buoyancy is maintained by cerebrospinal fluid (CSF) hydrostatic pressure within intracranial compartments.
  • Decompressive craniectomy disrupts the natural intracranial pressure equilibrium, exposing the brain to atmospheric pressure.
  • Increased intracranial pressure (ICP) is a critical condition often managed with craniectomy.

Observation:

  • Four patients who underwent craniectomy for elevated ICP developed reversible transtentorial herniation.
  • Herniation occurred after lumbar puncture or assuming an upright position, despite normalized ICP.
  • Clinical signs included unilateral dilated pupils, decreased alertness, and extensor posturing.

Findings:

  • Transtentorial herniation can occur post-craniectomy even without elevated ICP.

Related Experiment Videos

  • A negative pressure gradient between atmospheric and intracranial pressure, exacerbated by CSF changes from lumbar puncture, is implicated.
  • The "sunken pattern" at the craniectomy site may contribute to this pressure imbalance.

    • Implications:

    • Lumbar puncture in post-craniectomy patients poses a risk of herniation and should be avoided or performed with caution (head-down position).
    • Management of post-craniectomy herniation involves repositioning (flat or head-down) and considering early cranioplasty.
    • This highlights the importance of understanding pressure dynamics in the post-surgical cranial cavity.