- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03925987
Predicting Treatment Response to Exposure Therapy Using Carbon Dioxide
December 8, 2023 updated by: Laureate Institute for Brain Research, Inc.
Predicting Treatment Response to Exposure Therapy Using a CO2 Habituation Paradigm in Patients With High Levels of Anxiety Sensitivity
Anxiety disorders affect over a quarter of the population, yet very little is known about the variables that predict treatment outcome.
The planned study explores whether a patient's response to a physiological test involving inhalation of carbon dioxide predicts their response to exposure therapy.
Study Overview
Status
Completed
Intervention / Treatment
Detailed Description
Anxiety Sensitivity (AS) refers to an individual's fear of experiencing anxiety-related symptoms (e.g., dyspnea or heart palpitations) and is a core construct underlying the initiation and maintenance of pathological anxiety.
Recent evidence suggests that reducing AS may be critical for the prevention and treatment of anxiety across diagnostic categories.
Exposure therapy, an important component of cognitive behavioral therapy (CBT), is one of the most effective treatments for reducing AS, and has been shown to improve symptoms across a number of different anxiety disorders.
Meta-analyses reveal an approximately 50% treatment response rate, with the remaining half of patients showing either no response or dropping out of treatment early.
Unfortunately, there is a paucity of research exploring which variables predict treatment outcome and there are currently no tests for predicting which patients would benefit the most from exposure therapy.
In this study, participants will complete two sessions of a carbon dioxide (CO2) habituation paradigm, a safe and noninvasive physiological test that entails repeated exposures to single vital capacity inhalations of 20% CO2.
Both CO2 testing sessions will be completed within a 72-hour time period.
Patients then complete a 10-week group-based exposure therapy to determine whether an individual's degree of habituation to CO2 predicts treatment outcome.
Study Type
Interventional
Enrollment (Actual)
70
Phase
- Not Applicable
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
-
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Oklahoma
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Tulsa, Oklahoma, United States, 74136
- Laureate Institute for Brain Research
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Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
18 years to 55 years (Adult)
Accepts Healthy Volunteers
Yes
Description
Inclusion Criteria:
- DSM-V diagnosis of an Anxiety disorder (Generalized Anxiety Disorder, Social Anxiety Disorder, Panic Disorder, Agoraphobia)
- Anxiety Sensitivity Index (ASI-3) total score > 29
- Overall Anxiety Severity and Impairment Scale (OASIS) score > 8
- Between 18-55 years of age
- Subject must be "treatment-seeking" and willing to enroll in the 10-week group-based Exposure Therapy
Exclusion Criteria:
- Comorbid Bipolar Disorder, Schizophrenia, Anorexia or Bulimia Nervosa, or Obsessive-Compulsive Disorder
- Current Substance Use Disorder > moderate (within the past 6 months)
- Currently taking a psychotropic medication
- Currently receiving psychotherapy/counseling for anxiety
- Currently being treated as an inpatient
- Active suicidal ideation with intent or plan
- History of neurological, cardiovascular or respiratory problems (e.g., asthma, severe brain injury)
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: Basic Science
- Allocation: N/A
- Interventional Model: Single Group Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Exposure therapy
Participants complete 10 weekly sessions of a group-based exposure therapy class for anxiety disorders.
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10 weekly sessions of group-based exposure therapy
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Between-session habituation of self-reported anxiety
Time Frame: Across two days of CO2 testing within a 72-hour window
|
Maximum anxiety rating on a 10-point rating dial (0=no anxiety to 10=most anxiety ever) during day 1 of CO2 testing minus the maximum anxiety rating during day 2 of CO2 testing
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Across two days of CO2 testing within a 72-hour window
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Between-session habituation of self-reported dyspnea
Time Frame: Across two days of CO2 testing within a 72-hour window
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Dyspnea rating (difficulty breathing, shortness of breath or smothering) on a 100-point visual analogue scale (0=not at all to 100=extremely) during day 1 of CO2 testing minus the dyspnea rating during day 2 of CO2 testing
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Across two days of CO2 testing within a 72-hour window
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Between-session reduction in avoidance behavior
Time Frame: Across two days of CO2 testing within a 72-hour window
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Average response latency (in seconds) between vital capacity breaths of CO2 during day 1 of CO2 testing minus the average response latency during day 2 of CO2 testing
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Across two days of CO2 testing within a 72-hour window
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Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Investigators
- Principal Investigator: Justin Feinstein, PhD, Principal Investigator
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start (Actual)
June 7, 2018
Primary Completion (Actual)
January 31, 2020
Study Completion (Actual)
July 31, 2020
Study Registration Dates
First Submitted
April 22, 2019
First Submitted That Met QC Criteria
April 22, 2019
First Posted (Actual)
April 24, 2019
Study Record Updates
Last Update Posted (Estimated)
December 15, 2023
Last Update Submitted That Met QC Criteria
December 8, 2023
Last Verified
December 1, 2023
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- CoBRE CO2
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
NO
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
No
Studies a U.S. FDA-regulated device product
No
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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