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Hyperventilation in panic disorder and social phobia.

A E Nardi1, A M Valença, I Nascimento

  • 1Laboratory of Panic and Respiration, Institute of Psychiatry, Federal University of Rio de Janeiro, Brazil. aenardi@novanet.com.br

Psychopathology
|April 24, 2001
PubMed
Summary

Hyperventilation reliably induced panic attacks in most panic disorder patients, but not social phobics, suggesting a useful diagnostic test for panic disorder.

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Area of Science:

  • Psychiatry
  • Clinical Psychology
  • Neuroscience

Background:

  • Panic disorder and social phobia are distinct anxiety disorders.
  • Hyperventilation is a known trigger for panic attacks in susceptible individuals.

Purpose of the Study:

  • To investigate the efficacy of hyperventilation in inducing panic attacks in patients with panic disorder and social phobia.
  • To compare the response to hyperventilation between anxiety disorder patients and healthy controls.

Main Methods:

  • Recruitment of 26 panic disorder patients, 22 social phobics, and 25 healthy volunteers, all drug-free for one week.
  • Induction of hyperventilation at 30 breaths/min for 3 minutes.
  • Administration of anxiety scales before and after the hyperventilation challenge.

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Main Results:

  • Panic attacks were induced in 61.5% of panic disorder patients, 22.7% of social phobics, and 4.0% of controls (p < 0.01 for panic disorder vs. control).
  • Panic disorder patients showed significantly higher panic attack rates compared to both social phobics (p < 0.05) and controls.
  • Both anxiety disorder groups exhibited greater sensitivity to hyperventilation than the control group.

Conclusions:

  • Voluntary hyperventilation is an effective method for inducing panic attacks in a significant proportion of panic disorder patients.
  • This hyperventilation challenge may serve as a simple and valuable diagnostic tool for specific panic disorder cases.
  • The findings highlight differential responses to hyperventilation between panic disorder and social phobia.