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Related Experiment Videos

Waning of panic sensations during prolonged hyperventilation.

M A van den Hout1, P De Jong, J Zandbergen

  • 1Department of Mental Health Sciences/Experimental Psychopathology, Limburg University, Maastricht, The Netherlands.

Behaviour Research and Therapy
|January 1, 1990
PubMed
Summary

Panic attacks may end because prolonged hyperventilation lessens bodily sensations. Even with continued hyperventilation, panic symptoms decreased in healthy subjects, suggesting a time-limited nature of panic due to reduced sensory input.

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Area of Science:

  • Psychology
  • Physiology

Background:

  • Panic theories often involve hyperventilatory positive feedback loops.
  • Existing models do not fully explain panic attack termination.

Purpose of the Study:

  • To investigate if prolonged hyperventilation leads to a decrease in panic symptom salience.
  • To test the hypothesis that panic attacks are time-limited due to reduced sensory perception.

Main Methods:

  • Twenty healthy subjects underwent forceful hyperventilation for 90 minutes, maintaining a 55% reduction in pCO2.
  • A control group (n=20) engaged in normal ventilation.
  • Panic symptoms were assessed using DSM-IIIR criteria.

Main Results:

  • Subjects undergoing prolonged hyperventilation reported a significant decline in both the intensity and number of panic symptoms.

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  • No panic symptoms were observed in the control group.
  • Panic symptoms waned despite sustained, pronounced hyperventilation.

    • Conclusions:

    • Panic attacks may be time-limited, even when hyperventilation persists, due to diminished sensory perception.
    • Prolonged hyperventilation may reduce the salience of bodily sensations, potentially through habituation or local physiological changes decreasing interoceptive input.