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Bulging brains.

J Weickenmeier1, P Saze2, C A M Butler3

  • 1Department of Mechanical Engineering, Stanford University, Stanford, CA 94305, USA, weickenmeier@stanford.edu.

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|November 21, 2017
PubMed
Summary
This summary is machine-generated.

Decompressive craniectomy relieves brain swelling but can cause significant strain. This study models brain mechanics during swelling, revealing universal locations of maximum stretch to minimize damage.

Keywords:
Soft matterbraincraniectomyfinite element analysishyperelasticityneuromechanicsswelling

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Area of Science:

  • Biomechanics
  • Neurosurgery
  • Medical Physics

Background:

  • Brain swelling increases intracranial pressure, potentially causing severe neurological damage.
  • Decompressive craniectomy is a surgical procedure to alleviate this pressure by removing part of the skull.
  • The mechanical effects of brain bulging during decompressive craniectomy are not well understood.

Purpose of the Study:

  • To characterize the deformation, strain, and stretch in bulging brains using mechanical field theories.
  • To identify universal patterns of maximum mechanical stress in swollen brains after decompressive craniectomy.

Main Methods:

  • Application of nonlinear field theories of mechanics to model brain deformation.
  • Quantification of strain and stretch in brain tissue under simulated swelling conditions.

Main Results:

  • Even small brain swelling volumes (28-56 ml) induce maximum principal strains exceeding 30%.
  • Maximal normal stretches of 1.3 occur deep within the bulge, while maximal tangential stretches of 1.3 are observed at the craniectomy edge.
  • Locations of maximum stretch are consistently found across different swelling scenarios.

Conclusions:

  • The mechanical model provides insights into the structural consequences of brain swelling and decompressive craniectomy.
  • Findings can inform surgical decisions regarding the shape and placement of the skull opening.
  • Optimizing decompressive craniectomy based on mechanical principles may reduce brain damage and improve patient outcomes.