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Related Experiment Videos

Nocturnal panic: response to hyperventilation and carbon dioxide challenges.

M G Craske1, D H Barlow

  • 1Center for Stress and Anxiety Disorders, University at Albany, State University of New York.

Journal of Abnormal Psychology
|August 1, 1990
PubMed
Summary

This study found no significant differences in breathing patterns or CO2 sensitivity between nocturnal panic and daytime panic attack groups. These findings challenge theories linking chronic hyperventilation to nocturnal panic attacks.

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Area of Science:

  • Psychiatry
  • Respiratory Medicine
  • Sleep Medicine

Background:

  • Nocturnal panic attacks are a distinct phenomenon from daytime panic attacks.
  • The role of respiratory factors, specifically CO2 hypersensitivity and chronic hyperventilation, in nocturnal panic remains unclear.
  • Existing models suggest these respiratory mechanisms may underlie nocturnal panic.

Purpose of the Study:

  • To investigate the role of ventilatory response in nocturnal panic.
  • To compare respiratory measures (chronic hyperventilation and CO2 hypersensitivity) between individuals with nocturnal panic and those with only daytime panic attacks.
  • To determine if differences in CO2 sensitivity or baseline pCO2 explain nocturnal panic.

Main Methods:

  • A comparative study design was employed.

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  • Participants with nocturnal panic were compared to those with only daytime panic attacks.
  • Standardized laboratory assessment included baseline pCO2 (chronic hyperventilation measure) and response to ventilatory challenges (CO2 hypersensitivity), alongside subjective and psychophysiological measures during hyperventilation and CO2 inhalation.

    • Main Results:

    • No significant differences were observed between the nocturnal panic and daytime panic groups in subjective measures.
    • No significant differences were found in physiological measures, including baseline pCO2 and response to CO2 challenges.
    • The frequency of panic occurring during the laboratory assessment did not differ between the groups.

    Conclusions:

    • The findings do not support models that identify central CO2 hypersensitivity and chronic hyperventilation as primary mechanisms for nocturnal panic.
    • Respiratory factors like CO2 hypersensitivity and chronic hyperventilation may not be key drivers of nocturnal panic attacks.
    • Further research is needed to explore alternative mechanisms underlying nocturnal panic.