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Respiratory, autonomic, and experiential responses to repeated inhalations of 20% CO2 enriched air in panic disorder, social phobia, and healthy controls |
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| Authors: | Jens Blechert Frank H. Wilhelm Alicia E. Meuret Walton T. Roth |
| Affiliation: | a Department of Clinical Psychology and Psychotherapy, Institute for Psychology, University of Freiburg, Germany b Department of Clinical Psychology and Psychotherapy, Faculty of Psychology, University of Basel, Missionsstrasse 60/62, CH-4055 Basel, Switzerland c Department of Psychology, Southern Methodist University, Dallas, TX, USA d Department of Psychiatry and Behavioral Sciences, Stanford University, Stanford, CA, USA e Department of Veterans Affairs Health Care System, Palo Alto, CA, USA |
| Abstract: | Inhalation of carbon dioxide (CO2) enriched air triggers anxiety in panic disorder (PD) patients, which is often interpreted as a sign of biological vulnerability. However, most studies have not measured respiration in these tasks. We compared patients with PD (n = 20) and social phobia (SP, n = 19) to healthy controls (n = 18) during eight inhalations of 20% CO2, preceded and followed by two inhalations of room air, while continuously measuring subjective anxiety and dyspnea as well as autonomic and respiratory variables. PD patients showed increased reactivity and delayed recovery during CO2 inhalations for most measures. Unlike both other groups, the PD group's tidal volume responses did not habituate across CO2 inhalations. However, PD patients did not differ from SP patients on most other measures, supporting a continuum model of CO2 sensitivity across anxiety disorders. Both patient groups showed continued reactivity during the last air inhalations, which is unlikely to be due to a biological sensitivity. |
| Keywords: | Anxiety disorder Carbon dioxide Habituation Sensitization Psychophysiology Biological challenge |
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