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Related Experiment Videos

Brain tissue acid-base changes during ischemia.

W E Hoffman1, F T Charbel, G Edelman

  • 1Department of Anesthesiology, University of Illinois at Chicago, Chicago, Illinois, USA. whoffman@uic.edu

Neurosurgical Focus
|May 15, 1997
PubMed
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Brain tissue acidosis during ischemia is linked to neuronal injury. Studies show extracellular acidosis may persist post-ischemia due to ion exchange, impacting brain recovery.

Area of Science:

  • Neuroscience
  • Biochemistry
  • Pathophysiology

Background:

  • Brain tissue acidosis is suspected to contribute to neuronal damage during ischemic events.
  • Understanding the dynamics of pH and gas concentrations in brain tissue during ischemia is crucial for neurological research.

Purpose of the Study:

  • To measure brain extracellular concentrations of hydrogen ions (H+), carbon dioxide (PCO2), and bicarbonate (HCO3-) during temporary cerebral ischemia.
  • To investigate the recovery of these parameters after the ischemic period.

Main Methods:

  • Cerebral ischemia was induced by temporary occlusion of middle or anterior cerebral arteries in patients undergoing cerebrovascular surgery.
  • A specialized probe measured tissue PCO2, pH, and temperature in real-time during occlusion and a 10-minute recovery period.

Related Experiment Videos

  • A control group experienced induced hypercapnia (increased PaCO2) to compare physiological responses.

    • Main Results:

    • Temporary ischemia led to a 100% increase in tissue H+ and a 60% increase in PCO2, with a 20% decrease in HCO3-.
    • Following ischemia, only PCO2 levels returned to baseline within 10 minutes; H+ and HCO3- remained altered.
    • Induced hypercapnia caused transient increases in H+, PCO2, and HCO3-, which normalized within 10 minutes.

    Conclusions:

    • Results suggest rapid equilibration of lactic acidosis across cell membranes during ischemia, reducing extracellular HCO3-.
    • Extracellular acidosis may be prolonged after ischemia due to the extrusion of H+ from cells via membrane ion exchange.
    • These findings highlight the complex acid-base balance shifts in brain tissue during and after ischemic events.