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Physiologic parameters of the Cushing reflex.

P A Grady1, O R Blaumanis

  • 1Department of Neurology, University of Maryland School of Medicine, Baltimore 21201.

Surgical Neurology
|June 1, 1988
PubMed
Summary
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Increased intracranial pressure in dogs elevates carbon dioxide, triggering increased respiration, blood pressure, and heart rate. These physiological responses aim to stabilize local cerebral carbon dioxide tension.

Area of Science:

  • Neuroscience
  • Physiology

Background:

  • Intracranial pressure (ICP) regulation is crucial for brain health.
  • Understanding the systemic effects of elevated ICP is vital for clinical management.

Purpose of the Study:

  • To investigate the relationship between increased intracranial pressure and systemic blood pressure.
  • To determine the role of blood gas tensions in mediating these cardiovascular responses.

Main Methods:

  • Anesthetized dogs were subjected to hydrostatic increases in intracranial pressure.
  • Continuous monitoring of blood gas tensions, systemic blood pressure, and respiration was performed.

Main Results:

  • Gradual ICP increases led to elevated cerebral venous carbon dioxide tension.

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  • This was followed by increased respiration, a rise in blood pressure, and elevated heart rate.
  • Blood pressure changes were strongly correlated with alterations in carbon dioxide tension.

    • Conclusions:

    • Systemic blood pressure responses to increased ICP are primarily mediated by changes in carbon dioxide tension.
    • Physiological responses aim to maintain stable local cerebral carbon dioxide levels.
    • These findings offer insights into the body's compensatory mechanisms under elevated ICP.