title: Low baseline pCO2 predicts poorer outcome from behavioral treatment: evidence from a mixed anxiety disorders sample.
abstract: Low levels of end-tidal partial pressure of carbon dioxide (pCO2)-the amount of carbon dioxide measured from expired air-are commonly found in individuals with anxiety disorders but have not been examined as predictors of outcome from anxiety treatment. The current study examined pre-treatment baseline pCO2 as a predictor of outcome from cognitive behavioral therapy (CBT) and acceptance and commitment therapy (ACT) for anxiety disorders. Sixty-one individuals with a Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) defined principal anxiety disorder diagnosis completed 12 sessions of either CBT or ACT. Baseline pCO2 was measured prior to entering treatment. Self-reported anxiety symptoms and quality of life were assessed at pre-treatment, post-treatment, and 6- and 12-month follow-up from baseline. Low baseline pCO2 was associated with higher anxiety symptoms and lower quality of life across follow-up timepoints, above and beyond baseline symptom severity. These results suggest that low baseline pCO2 predicts poorer outcome from CBT and ACT for anxiety and may warrant treatment that directly addresses respiratory dysregulation.
authors: Department of Psychology, University of California, Los Angeles (UCLA), 1285 Franz Hall, Box 951563, Los Angeles, CA 90095-1563, USA. Electronic address: cdavies@psych.ucla.edu.
authors: Carolyn D
authors: CD
authors: Davies
authors: Department of Psychology, University of California, Los Angeles (UCLA), 1285 Franz Hall, Box 951563, Los Angeles, CA 90095-1563, USA.
authors: Michelle G
authors: MG
authors: Craske
mesh_terms: D064869:Acceptance and Commitment Therapy / Q000379:methods*; D000328:Adult; D001008:Anxiety Disorders / Q000503:physiopathology* / Q000523:psychology / Q000628:therapy; D002245:Carbon Dioxide / Q000502:physiology*; D015928:Cognitive Behavioral Therapy / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D011788:Quality of Life; D057566:Self Report; D013990:Tidal Volume / Q000502:physiology; D016896:Treatment Outcome
chemical_list: D002245:Carbon Dioxide
keywords: Anxiety; Behavioral treatment; End-tidal pCO(2); Respiration