Post-Traumatic Stress DisorderPhase 2NCT01031979
Prolonged Exposure for Post Traumatic Stress Disorder (PTSD) With/Without Yohimbine
A Phase 2 study testing Yohimbine in people with Post-Traumatic Stress Disorder, run by VA Office of Research and Development at 1 site in United States.
Trial summary
The proposed study has three distinct but related research objectives. The first goal is to measure physiological correlates of successful treatment with Prolonged Exposure (PE) therapy for posttraumatic stress disorder (PTSD) in veterans of the Iraq and Afghanistan wars. Read more about this study
- Who is it for?
- Ages 18 to 45 years, men only
- Conditions the study is for
- Post-Traumatic Stress Disorder
- What is being tested?
- Yohimbine
- Could I receive a placebo?
- Yes, some participants may receive a placebo
- How many people
- 26 participants
- Where
- 1 siteUnited States
- Study dates
- 1 Dec 2010to 7 Jul 2015
- Phase
- Phase 2
- Are there results?
- Yes, posted in the registrySummary in the doctors' view
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 45 years
- Men only
- No healthy volunteers
- Adult
Who may be able to join
- Subjects must be competent to provide informed consent for research participation.
- Subjects must be male veterans and post deployed active duty male personnel of OEF/OIF.
- Subjects must be between the ages of 18 and 45.
- Subjects must meet DSM-IV diagnostic criteria for PTSD on the CAPS.
- For subjects taking SSRI's, subjects must be stabilized on the current prescribed dose for a period of at least 14 days prior to the trial and remain at that dose for the remainder of the study. Subjects who change their SSRI status or dosage during the study will continue to receive services via the study resources but data generated will not be used in analyses. Subjects will be eligible for the study if they are willing to titrate off potentially confounding agents prior to yohimbine administration (for a period of five half-lives), given that such titration is also clinically appropriate and deemed to be in the patient's best interests.
Who cannot join
- Subjects with a recent (< 2 month) history of psychiatric hospitalization or suicide attempt. Recent work with veterans with severe mental illness suggests that a 2-month period of stabilization is sufficient to minimize risk and possible relapse (Frueh, 2005). Subjects with an existing diagnosis of schizophrenia or other Axis I serious mental illnesses (SMI, besides PTSD) will be excluded. SMI will include any severe and persistent mental illness.
- Subjects with a current diagnosis of drug dependence, due to potential interactions with study measurements and treatments. Alcohol use disorders will be allowed given that subjects can pass exclusion criterion 12 without withdrawal symptoms.
- Subjects with any acute illness or fever. Individuals who otherwise meet study criteria will be rescheduled for evaluation for participation.
- Subjects with evidence of or a history of clinically significant hematological, endocrine, cardiovascular, hepatic, pulmonary, renal, gastrointestinal, or neurological disease including diabetes, as these conditions may affect physiological/subjective responses.
- Subjects with SCID-diagnosed panic disorder, as yohimbine may precipitate panic attacks.
- Subjects with an abnormal ECG.
Show all 12Show fewer
- Subjects with a blood pressure of 140/90 or higher, as yohimbine has been shown to elevate blood pressure.
- Subjects taking Beta blockers, alpha-adrenergic agents, Beta-agonist inhalers, opiates or opiate antagonists and any psychotropic medications other than SSRI's because these may affect test response.
- Subjects who are unwilling or unable to maintain abstinence for three days prior to yohimbine administration from over-the-counter drugs with sympathomimetic properties, e.g., asthma medications, cold medicines with ephedrine, dietary supplements with ephedrine alkaloids, and illegal drugs, e.g., amphetamines, methamphetamine, cocaine, and MNDA as well as alcohol because these may exacerbate the action of yohimbine.
- Subjects taking alpha-adrenergic antagonists, e.g. prazosin for hypertension; and beta-adrenergic antagonists, e.g. propranolol. Because they may attenuate effects of yohimbine. Subjects will be eligible for the study if they are willing to titrate off potentially confounding agents prior to yohimbine administration (for a period of five half-lives), given that such titration is also clinically appropriate and deemed to be in the patient's best interests.
- Asthmatic subjects and subjects on medications for hypertension, due to criteria 9 and 10.
- These inclusion/exclusion criteria will allow the majority of veterans treated in the PCT to be study eligible. Accordingly, the sample will be likely generalizable to the population of interest.
Trial locations and contacts
1 site in 1 country.
United States1 site
Ralph H. Johnson VA Medical Center, Charleston, SC
Charleston, South Carolina, 29401-5799
About this study
Official title: Psychophysiology of Prolonged Exposure for PTSD With/Without Yohimbine
The proposed study has three distinct but related research objectives. The first goal is to measure physiological correlates of successful treatment with Prolonged Exposure (PE) therapy for posttraumatic stress disorder (PTSD) in veterans of the Iraq and Afghanistan wars. Individuals with PTSD often experience elevated heart rates and other objectively measurable signs of anxiety when confronted with safe situations that remind them of past dangerous situations. We will measure physiological responses and compare the outcomes to patient's self reported subjective accounts of symptom improvement on traditional measures of PTSD. Developing a way to measure objective gains in symptoms improvement may help researchers who are studying ways to improve PTSD treatment. The second goal of the study is to investigate if yohimbine, a drug found to promote a specific type of learning, will improve treatment outcomes for veterans in PTSD treatment. The third goal is to investigate if ability to get used to loud startling audio tones correlates to baseline PTSD pathology and treatment outcomes for PE. This goal represents an important step forward in understanding characteristics of heritable traits that are related PTSD. It is significant because such research may one day lead to the development of individual responder policies that will assist patients by individualizing treatment plans based on personal characteristics.
Read the detailed description
The proposed study has three distinct but related research objectives. The first research goal is to measure psychophysiological correlates of treatment gains associated with Prolonged Exposure (PE) therapy for PTSD in veterans of Operations Enduring Freedom and Iraqi Freedom (OEF/OIF). Specifically, heart rate, heart rate variability, skin conductance, and facial electromyography, will be recorded before and after treatment during a three minute anxiety probe specific to the patient's index trauma. These measures will be compared to patient's self reported subjective accounts of symptom improvement on traditional measures of PTSD pathology (Subjective Units of Distress (SUDs), PTSD Checklist-Military Version (PCL), Clinician Administered PTSD Scale (CAPS), and the Beck Depression Inventory (BDI)). This goal is significant for veterans because currently no widely used objective criteria exist to measure treatment progress in PTSD. While the preponderance of existing evidence suggests that no one objective psychophysiological measurement will be a valid correlate for all individuals, even establishing a measurement paradigm that can show mean differences between groups will provide researchers with an objective tool to measure outcomes on clinical trials.
The second goal of the study is to investigate if the administration of yohimbine, a drug found to promote the extinction of conditioned fear in animal models, and more recently, in humans with claustrophobia, improves the facilitation of fear extinction in PE. Yohimbine is a safe drug that is already extensively used in human populations. Specifically, this goal will be investigated using a double blind placebo controlled randomized trial design. The hypothesis is that one 21mg oral dose of yohimbine given concurrently with a 40 minute imaginal exposure exercise in PE will lead to a greater reduction in cue-induced anxiety during the following weekly PE session than placebo. This goal is significant because current projections of PTSD in OEF/OIF veterans indicate that the need for psychological services will likely outpace the supply of such services. Accordingly, assisting treatments to be more efficient will likely translate into more veterans receiving much needed mental health services.
The 3rd goal is to investigate if ability to habituate to loud, 95db, audio tones correlates to baseline PTSD pathology and treatment outcomes for PE. This goal represents an important step forward in understanding characteristics of trait habituation, fear extinction, and learning in humans, which are all factors related to the successful treatment of PTSD. It is also significant because such research may lead to the development of individual responder policies that will assist veterans by individualizing treatment plans based on personal characteristics.
- Conditions
- Post-Traumatic Stress Disorder
- Being tested
- Yohimbine, Placebo
- Keywords
- PTSD, Prolonged Exposure, extinction, habituation, psychophysiology
- Medical subject headings
- Stress Disorders, Post-Traumatic, Substance-Related Disorders
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
YohimbineDrug
alpha-2 adrenergic receptor antagonist
PlaceboDrug
Placebo
| Study group | Role | What they receive |
|---|---|---|
| Yohimbime Group | Experimental | Patients will take one 21.6 mg. dose of yohimbine one hour before first imaginal exposure in PE. Receives: Drug: Yohimbine |
| Placebo Group | Placebo comparator | Patients will take a placebo one hour before first imaginal exposure in PE. Receives: Drug: Placebo |
What is being measured
The primary outcome is the main question the study is designed to answer.
Trauma-Cued Heart Rate Reactivity
The primary outcome was trauma-cued heart rate reactivity a week after the drug visit as measured by the PTSD Brief Reactivity (PBR) task. For each patient, a 3-minute trauma script was constructed containing vivid details of the target trauma and used in tandem with a standard neutral script for baseline measurement. Heart rate reactivity for each time point was the beats per minute (BPM) difference between the neutral and trauma scripts represented as a slope.
Measured: One week after drug visit
Secondary outcomes (3)
Change in Clinician Administered PTSD Scale (CAPS) Score
The CAPS is a structured interview for diagnosis of PTSD and is widely considered the gold-standard assessment. The CAPS produces a total score ranging from 0-136, with higher scores indicating more severe PTSD symptom severity. A 15-point decrease is considered clinically significant.
Measured: 0 Weeks, 15 weeks
Change in Post Traumatic Stress Disorder Checklist (PCL) Score
The PCL is a 17-item self-report measure of PTSD symptom severity based on the DSM-IV and has adequate psychometric properties. The PCL produces a score range between 17-85, with higher scores indicating more distress related to PTSD symptoms. A 10-point decrease on the PCL is considered clinically significant.
Measured: 0 weeks, 15 weeks
Change in Becks Depression Inventory (BDI-II) Score
The BDI-II is a 21-item self-report measure that assesses depressive behavioral symptoms. It has demonstrated adequate psychometric validity, and external validity and is used widely as the dependent variable in treatment outcomes research. The BDI-II produces score ranges from 0-63, with higher scores indicating more severe depression symptom severity. A 5-point decrease on the BDI-II is considered clinically significant.
Measured: 0 weeks, 15 weeks
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted15 Dec 2009 (estimated)
- Study start1 Dec 2010
- Primary completion1 Apr 2015
- Study completion7 Jul 2015
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Posted resultsParticipant flow, outcome measures and adverse events reported by the sponsor.
- Publications (2)Papers the sponsor has linked to this study.
- Other trials for Post-Traumatic Stress DisorderStudies of the same condition, open and under way.
- More trials run by VA Office of Research and DevelopmentThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 2
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Quadruple blind
- Who is masked
- Participant, Care provider, Investigator, Outcomes assessor
- Enrolment
- 26 participants (actual)
Sponsor and investigators
- Lead sponsor
- VA Office of Research and Development
- Sponsor type
- US federal agency
- Responsible party
- Sponsor
- Investigators
- Peter W. Tuerk, PhD MA BA, Principal investigator, Ralph H. Johnson VA Medical Center, Charleston, SC
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01031979
- Sponsor's protocol ID
- CDA-2-013-09F
- Status last verified
- Jan 2018
- First submitted
- 4 Dec 2009
- Last updated
- 7 Feb 2018
- Results posted
- Yes, on ClinicalTrials.gov
- Data monitoring committee
- No
- FDA-regulated drug
- Yes
- FDA-regulated device
- No
- Individual data sharing
- No
Publications
Keller SM, Tuerk PW. Evidence-based psychotherapy (EBP) non-initiation among veterans offered an EBP for posttraumatic stress disorder. Psychol Serv. 2016 Feb;13(1):42-8. doi: 10.1037/ser0000064. Epub 2015 Dec 14.
PubMed 26654474Yuen EK, Gros DF, Price M, Zeigler S, Tuerk PW, Foa EB, Acierno R. Randomized Controlled Trial of Home-Based Telehealth Versus In-Person Prolonged Exposure for Combat-Related PTSD in Veterans: Preliminary Results. J Clin Psychol. 2015 Jun;71(6):500-12. doi: 10.1002/jclp.22168. Epub 2015 Mar 25.
PubMed 25809565
Study at a glance
From the registry record, last updated by the sponsor on 7 Feb 2018. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Psychophysiology of Prolonged Exposure for PTSD With/Without Yohimbine
- ClinicalTrials.gov ID
- NCT01031979
- Acronym / sponsor ID
- CDA-2-013-09F
- Conditions
- Post-Traumatic Stress Disorder
- Keywords
- PTSD, Prolonged Exposure, extinction, habituation, psychophysiology
- Phase
- Phase 2
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 26 participants (actual)
- Lead sponsor
- VA Office of Research and DevelopmentUS federal agency
- Study start
- 1 Dec 2010 (actual)
- Primary completion
- 1 Apr 2015 (actual)
- Study completion
- 7 Jul 2015 (actual)
- First posted
- 15 Dec 2009 (estimated)
- Results
- Posted 24 Feb 2017
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The proposed study has three distinct but related research objectives. The first goal is to measure physiological correlates of successful treatment with Prolonged Exposure (PE) therapy for posttraumatic stress disorder (PTSD) in veterans of the Iraq and Afghanistan wars. Individuals with PTSD often experience elevated heart rates and other objectively measurable signs of anxiety when confronted with safe situations that remind them of past dangerous situations. We will measure physiological responses and compare the outcomes to patient's self reported subjective accounts of symptom improvement on traditional measures of PTSD. Developing a way to measure objective gains in symptoms improvement may help researchers who are studying ways to improve PTSD treatment. The second goal of the study is to investigate if yohimbine, a drug found to promote a specific type of learning, will improve treatment outcomes for veterans in PTSD treatment. The third goal is to investigate if ability to get used to loud startling audio tones correlates to baseline PTSD pathology and treatment outcomes for PE. This goal represents an important step forward in understanding characteristics of heritable traits that are related PTSD. It is significant because such research may one day lead to the development of individual responder policies that will assist patients by individualizing treatment plans based on personal characteristics.
Detailed description
The proposed study has three distinct but related research objectives. The first research goal is to measure psychophysiological correlates of treatment gains associated with Prolonged Exposure (PE) therapy for PTSD in veterans of Operations Enduring Freedom and Iraqi Freedom (OEF/OIF). Specifically, heart rate, heart rate variability, skin conductance, and facial electromyography, will be recorded before and after treatment during a three minute anxiety probe specific to the patient's index trauma. These measures will be compared to patient's self reported subjective accounts of symptom improvement on traditional measures of PTSD pathology (Subjective Units of Distress (SUDs), PTSD Checklist-Military Version (PCL), Clinician Administered PTSD Scale (CAPS), and the Beck Depression Inventory (BDI)). This goal is significant for veterans because currently no widely used objective criteria exist to measure treatment progress in PTSD. While the preponderance of existing evidence suggests that no one objective psychophysiological measurement will be a valid correlate for all individuals, even establishing a measurement paradigm that can show mean differences between groups will provide researchers with an objective tool to measure outcomes on clinical trials.
The second goal of the study is to investigate if the administration of yohimbine, a drug found to promote the extinction of conditioned fear in animal models, and more recently, in humans with claustrophobia, improves the facilitation of fear extinction in PE. Yohimbine is a safe drug that is already extensively used in human populations. Specifically, this goal will be investigated using a double blind placebo controlled randomized trial design. The hypothesis is that one 21mg oral dose of yohimbine given concurrently with a 40 minute imaginal exposure exercise in PE will lead to a greater reduction in cue-induced anxiety during the following weekly PE session than placebo. This goal is significant because current projections of PTSD in OEF/OIF veterans indicate that the need for psychological services will likely outpace the supply of such services. Accordingly, assisting treatments to be more efficient will likely translate into more veterans receiving much needed mental health services.
The 3rd goal is to investigate if ability to habituate to loud, 95db, audio tones correlates to baseline PTSD pathology and treatment outcomes for PE. This goal represents an important step forward in understanding characteristics of trait habituation, fear extinction, and learning in humans, which are all factors related to the successful treatment of PTSD. It is also significant because such research may lead to the development of individual responder policies that will assist veterans by individualizing treatment plans based on personal characteristics.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Quadruple blind (participant, care provider, investigator, outcomes assessor)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Yohimbime Group | Experimental | Drug: YohimbinePatients will take one 21.6 mg. dose of yohimbine one hour before first imaginal exposure in PE. |
| Placebo Group | Placebo comparator | Drug: PlaceboPatients will take a placebo one hour before first imaginal exposure in PE. |
Who may qualify
- Ages
- 18 to 45 years
- Sex
- Male only
- Healthy volunteers
- Not accepted
- Age groups
- Adult
Key inclusion criteria (5 listed)
- Subjects must be competent to provide informed consent for research participation.
- Subjects must be male veterans and post deployed active duty male personnel of OEF/OIF.
- Subjects must be between the ages of 18 and 45.
- Subjects must meet DSM-IV diagnostic criteria for PTSD on the CAPS.
- For subjects taking SSRI's, subjects must be stabilized on the current prescribed dose for a period of at least 14 days prior to the trial and remain at that dose for the remainder of the study. Subjects who change their SSRI status or dosage during the study will continue to receive services via the study resources but data generated will not be used in analyses. Subjects will be eligible for the study if they are willing to titrate off potentially confounding agents prior to yohimbine administration (for a period of five half-lives), given that such titration is also clinically appropriate and deemed to be in the patient's best interests.
Key exclusion criteria (12 listed)
- Subjects with a recent (< 2 month) history of psychiatric hospitalization or suicide attempt. Recent work with veterans with severe mental illness suggests that a 2-month period of stabilization is sufficient to minimize risk and possible relapse (Frueh, 2005). Subjects with an existing diagnosis of schizophrenia or other Axis I serious mental illnesses (SMI, besides PTSD) will be excluded. SMI will include any severe and persistent mental illness.
- Subjects with a current diagnosis of drug dependence, due to potential interactions with study measurements and treatments. Alcohol use disorders will be allowed given that subjects can pass exclusion criterion 12 without withdrawal symptoms.
- Subjects with any acute illness or fever. Individuals who otherwise meet study criteria will be rescheduled for evaluation for participation.
- Subjects with evidence of or a history of clinically significant hematological, endocrine, cardiovascular, hepatic, pulmonary, renal, gastrointestinal, or neurological disease including diabetes, as these conditions may affect physiological/subjective responses.
- Subjects with SCID-diagnosed panic disorder, as yohimbine may precipitate panic attacks.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Yohimbinealpha-2 adrenergic receptor antagonist | Drug | Yohimbime Group |
| PlaceboPlacebo | Drug | Placebo Group |
Primary outcome
Trauma-Cued Heart Rate Reactivity
Time frame: One week after drug visit
The primary outcome was trauma-cued heart rate reactivity a week after the drug visit as measured by the PTSD Brief Reactivity (PBR) task. For each patient, a 3-minute trauma script was constructed containing vivid details of the target trauma and used in tandem with a standard neutral script for baseline measurement. Heart rate reactivity for each time point was the beats per minute (BPM) difference between the neutral and trauma scripts represented as a slope.
3 secondary outcomes
Change in Clinician Administered PTSD Scale (CAPS) Score
Time frame: 0 Weeks, 15 weeks
Change in Post Traumatic Stress Disorder Checklist (PCL) Score
Time frame: 0 weeks, 15 weeks
Change in Becks Depression Inventory (BDI-II) Score
Time frame: 0 weeks, 15 weeks
Results and safety
Loading the posted results from ClinicalTrials.gov…
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 7 Feb 2018.
- Posted resultsParticipant flow, baseline, all outcome measures and adverse events.
- Derived from this study: PubMed 26654474Keller SM, Tuerk PW. Evidence-based psychotherapy (EBP) non-initiation among veterans offered an EBP for posttraumatic stress disorder. Psychol Serv. 2016 Feb;13(1):42-8. doi: 10.1037/ser0000064. Epub 2015 Dec 14.
- Derived from this study: PubMed 25809565Yuen EK, Gros DF, Price M, Zeigler S, Tuerk PW, Foa EB, Acierno R. Randomized Controlled Trial of Home-Based Telehealth Versus In-Person Prolonged Exposure for Combat-Related PTSD in Veterans: Preliminary Results. J Clin Psychol. 2015 Jun;71(6):500-12. doi: 10.1002/jclp.22168. Epub 2015 Mar 25.
- Individual participant dataSharing planned: No
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Peter W. Tuerk, PhD MA BA principal investigator
Ralph H. Johnson VA Medical Center, Charleston, SC
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 2 study testing Yohimbine in people with Post-Traumatic Stress Disorder, run by VA Office of Research and Development at 1 site in United States.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 5 inclusion and 12 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 7 Feb 2018. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in United States. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. Some participants in this study may receive a placebo. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
Yes. Results are posted in the registry (first posted 24 Feb 2017). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Trauma-Cued Heart Rate Reactivity (time frame: One week after drug visit). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT01031979, which also lists 2 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 7 Feb 2018.