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[Plasma osmolarity and cerebral volume].

G Boulard1

  • 1Département d'anesthésie-réanimation 3, CHU Pellegrin, 33076 Bordeaux, France. gery.boulard@chu-bordeaux.fr

Annales Francaises D'Anesthesie Et De Reanimation
|March 29, 2001
PubMed
Summary

The brain has an adaptive mechanism called cerebral osmoregulation that protects brain cells from changes in fluid osmolarity. This mechanism uses electrolytes and organic molecules to maintain brain volume, crucial for treating electrolyte disorders.

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Area of Science:

  • Neuroscience
  • Physiology
  • Nephrology

Context:

  • Extracellular fluid osmolarity and natremia are regulated by osmoreceptors and baroreceptors.
  • Brain extracellular fluid osmolarity is maintained by endothelial cells of brain capillaries, with isotonicity across the blood-brain barrier.
  • Systemic osmolarity disorders disrupt this balance, causing cerebral dehydration or edema.

Purpose:

  • To explain the physiological mechanisms of cerebral osmoregulation.
  • To highlight the role of electrolytes and organic osmoles in brain volume adaptation.
  • To discuss the implications for treating osmolarity and natremia disorders.

Summary:

  • Cerebral osmoregulation adapts to systemic osmolarity changes by modulating brain cell osmoactive molecule content (electrolytes and organic osmoles).
  • Acute experiments show brain water content variations are less than calculated, indicating an adaptive response.
  • Treatment of osmolarity disorders must consider the blood-brain barrier's osmotic gradient and the brain's adaptive capacity.

Impact:

  • Understanding cerebral osmoregulation is vital for managing conditions like hyponatremia and preventing complications such as pontine myelinolysis.
  • Informs treatment strategies for osmolarity disorders and neurosurgical fluid choices.
  • Emphasizes the risks of aggressive treatment for chronic hyponatremia due to decreased osmoregulation effectiveness.

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