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Psychosomatic Medicine, Vol 59, Issue 3 224-230, Copyright © 1997 by American Psychosomatic Society

ORIGINAL ARTICLES

Psychophysiological assessment of respiratory function in panic disorder: evidence for a hyperventilation subtype

MT Hegel and RJ Ferguson
Department of Psychiatry, Dartmouth Medical School, Lebanon, New Hampshire, USA.

OBJECTIVE: Previous research has found differences in respiratory function between panic disorder and other anxiety disorder populations. These differences have been explained as reflecting either a) a specific feature of panic disorder, b) merely a sign of increased general arousal, or c) a result of population sampling error. The current study addressed the question of such differences by using improved methodology over previous research. A preliminary evaluation of respiratory symptoms during panic attacks was undertaken as a means of identifying a respiratory-sensitive subtype of the panic patient. METHOD: Seventeen panic disorder patients (PD), 18 patients with generalized anxiety disorder (GAD), and 20 normal control (NC) subjects were administered a psychophysiological evaluation composed of baseline, stressor, and recovery phases. Panic patients were measured for the severity of respiratory symptoms during panic attacks. End-tidal CO2 (EtCO2) and respiration rate were measured throughout the psychophysiological evaluation. RESULTS: PDs demonstrated significantly lower baseline EtCO2 levels than the GADs and NCs, in spite of being equivalent to GADs on baseline anxiety levels. Moreover, panic patients reporting a high level of respiratory symptoms during panic attacks seemed to account for the bulk of observed differences. CONCLUSIONS: These findings lend support to a group of studies showing differences in respiratory function between panic disorder and other anxiety disorder populations. In addition, this study provides preliminary support for the presence of a distinct "hyperventilation subtype" of panic disorder. The implications of these findings for future research and treatment are discussed.


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