Obsessive-compulsive disorder (OCD) is a severe and debilitating anxiety disorder afflicting about 2% of the population. It is characterized by the presence of recurrent obsessions and/or compulsions that are time consuming and cause marked distress and/or impairment. Untreated, OCD runs a chronic and deteriorating course. According to the World Health Organization, OCD is among the top 10 leading causes of disability worldwide. Examination of non-medicinal treatments for OCD has focused on two distinct treatments: exposure and response prevention (ERP) and cognitive therapy (CT), often combined into an integrated cognitive-behavioural treatment (CBT). CBT is considered the first line psychological treatment for OCD, with estimates of response rates of between 70-80%. However, there are a significant number of treatment non-responders and the majority of responders are still left with impairing residual symptoms. One area of investigation that has shown potential benefit for general mood and anxiety disorders has been mindfulness-based interventions (MBIs), yet the potential benefits of MBIs in OCD has been largely unexamined, except for several small preliminary studies that show clinical promise. The purpose of this study is to examine the clinical benefits of a standardized MBI treatment for OCD in a large-scale, multi-site randomized controlled trial. The results of this study will directly determine whether Mindfulness can be considered an effective treatment for OCD. If this study can demonstrate that a short-term mindfulness intervention can significantly reduce the suffering associated with OCD, then the findings could easily be translated into routine clinical care in and out of hospital settings. Results of this study will also potentially add to our understanding of the mechanisms that drive OCD symptoms, improve our knowledge of psychological treatment mechanisms, and elucidate how biological factors influence psychological treatment outcomes.
Source : Importé depuis le centre
Cognitive Behavioural Therapy (CBT) is a first line psychological treatment for OCD with estimated response rates of between 70-80%. However, there are still a substantial number of treatment non-responders and the vast majority of responders are left with impairing residual symptoms. One new area of investigation that has shown potential benefit for the treatment of OCD has been mindfulness-based interventions (MBIs). This emerging literature provides proof of principle for the delivery and potential efficacy of MBIs for OCD, particularly as an adjunct to CBT, with all studies reporting large (d \> .80) treatment effects. To date, only our teams' small, non-controlled pilot study (N=19) has shown promise for a MBI as a stand-alone treatment for OCD separate from CBT (d = 1.10). However, all results to date for MBI treatments for OCD must be interpreted with caution as they have utilized small, underpowered sample sizes, have not included control groups, and failed to control for potentially confounding variables (e.g., medications, self-initiated exposures). The proposed four-year, two-site randomized controlled trial at two of Canada's leading OCD treatment centres (Sunnybrook Health Sciences Centre and St. Joseph's Healthcare Hamilton) that have been involved in developing and piloting MBI treatments for OCD will aim to test whether a structured, Mindfulness-Based Cognitive Therapy (MBCT) intervention for OCD is an efficacious treatment for a large, heterogeneous sample of DSM-5 (Diagnostic Statistical Manual of Mental Disorders 5th edition) diagnosed OCD participants. The primary aim of this proposed study is to examine whether a developed and piloted MBCT treatment for OCD is efficacious when compared to a waitlist condition and to explore its efficacy compared to CBT treatment for OCD. A secondary aim of the study is to examine the putative treatment mechanisms of MBCT. Past research examining treatment mechanisms in CBT for OCD have focused on the reduction of obsessional beliefs, anxiety sensitivity, and safety behaviours in producing better outcomes. In contrast, the hypothesized mechanisms in MBI treatments include the development of mindfulness skills such as acting with awareness, non-reactivity to and non-judging of inner experience, and reduction in mind wandering. The large-scale, powered RCT (randomized control trial) design will permit the examination of whether MBCT and CBT include overlapping or distinct treatment mechanisms. Treatment outcomes will be assessed with standardized measures of OCD symptomatology, general measures of mood and anxiety, a reliable and valid EEG measure to assess cognitive changes across treatment. If this study can demonstrate that a short-term mindfulness intervention can significantly reduce the suffering associated with OCD, then the findings could easily be translated into routine clinical care in and out of Canadian hospital settings. Results of this study will also potentially add to our understanding of the mechanisms that drive OCD symptoms, improve our knowledge of psychological treatment mechanisms, and elucidate how genetic/biological factors influence psychological treatment outcomes.
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RECRUTEMENT
Profil des participants
Limites d'âge
minimum : 18 ans
maximum : 65 ans
Sexe(s) des participants
ALL
Source : Importé depuis le centre
Condition médicale (spécialité visée)
Domaine de recherche
Donnée non disponible
Critères de sélection
Cohortes
Nom
Condition médicale
Traitement
État du recrutement
Cognitive Behaviour Therapy
This study arm will receive 12 weeks of cognitive behaviour therapy as an intervention.
Donnée non disponible
Inconnu
Mindfulness-based Cognitive Therapy
This study arm will receive 12 weeks of a mindfulness-based cognitive therapy intervention, along with open mindfulness sessions via an EEG headset.
Donnée non disponible
Inconnu
Waitlist
This study arm will not receive an intervention for 12 weeks.
Donnée non disponible
Inconnu
Cognitive Behaviour Therapy
État du recrutement
unknown
This study arm will receive 12 weeks of cognitive behaviour therapy as an intervention.
Mindfulness-based Cognitive Therapy
État du recrutement
unknown
This study arm will receive 12 weeks of a mindfulness-based cognitive therapy intervention, along with open mindfulness sessions via an EEG headset.
Waitlist
État du recrutement
unknown
This study arm will not receive an intervention for 12 weeks.
Données à jour depuis :
4 mars 2026
SITES ET CONTACTS
Centre principal
st. joseph's healthcare hamilton
HAMILTON, ONTARIO, CANADA
Recrutement local
—
FERMÉ
Aussi disponible à: TORONTO, (ONTARIO)
Dernière modification :
4 mars 2026
Données à jour depuis :
6 mars
Origine des données :
clinicaltrials.gov
* experiencing clinically significant obsessive-compulsive symptoms based on the Yale-Brown Obsessive Compulsive Scale (YBOCS; score \> 17)
* if on medications for OCD, must be stabilized, i.e. are currently receiving an adequate dose (equivalent of 40mg/day of fluoxetine) for an adequate duration (at least 8 weeks of treatment) prior to the initiation of the study.
Exclusion Criteria:
* concurrent diagnosis of a severe mood disorder, schizophrenia or other psychotic disorders, or substance abuse/dependence
* suspected organic pathology
* an active comorbid medical condition that may require urgent intervention during the treatment.
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Cohortes
Thérapie ou Intervention proposée
Cohortes
Nom
Condition médicale
Traitement
État du recrutement
Cognitive Behaviour Therapy
This study arm will receive 12 weeks of cognitive behaviour therapy as an intervention.
Donnée non disponible
Inconnu
Mindfulness-based Cognitive Therapy
This study arm will receive 12 weeks of a mindfulness-based cognitive therapy intervention, along with open mindfulness sessions via an EEG headset.
Donnée non disponible
Inconnu
Waitlist
This study arm will not receive an intervention for 12 weeks.
Donnée non disponible
Inconnu
Cognitive Behaviour Therapy
État du recrutement
unknown
This study arm will receive 12 weeks of cognitive behaviour therapy as an intervention.
Mindfulness-based Cognitive Therapy
État du recrutement
unknown
This study arm will receive 12 weeks of a mindfulness-based cognitive therapy intervention, along with open mindfulness sessions via an EEG headset.
Waitlist
État du recrutement
unknown
This study arm will not receive an intervention for 12 weeks.
Données à jour depuis :
4 mars 2026
Description de l'étude
Description de l'étude
Résumé de l'étude
Obsessive-compulsive disorder (OCD) is a severe and debilitating anxiety disorder afflicting about 2% of the population. It is characterized by the presence of recurrent obsessions and/or compulsions that are time consuming and cause marked distress and/or impairment. Untreated, OCD runs a chronic and deteriorating course. According to the World Health Organization, OCD is among the top 10 leading causes of disability worldwide. Examination of non-medicinal treatments for OCD has focused on two distinct treatments: exposure and response prevention (ERP) and cognitive therapy (CT), often combined into an integrated cognitive-behavioural treatment (CBT). CBT is considered the first line psychological treatment for OCD, with estimates of response rates of between 70-80%. However, there are a significant number of treatment non-responders and the majority of responders are still left with impairing residual symptoms. One area of investigation that has shown potential benefit for general mood and anxiety disorders has been mindfulness-based interventions (MBIs), yet the potential benefits of MBIs in OCD has been largely unexamined, except for several small preliminary studies that show clinical promise. The purpose of this study is to examine the clinical benefits of a standardized MBI treatment for OCD in a large-scale, multi-site randomized controlled trial. The results of this study will directly determine whether Mindfulness can be considered an effective treatment for OCD. If this study can demonstrate that a short-term mindfulness intervention can significantly reduce the suffering associated with OCD, then the findings could easily be translated into routine clinical care in and out of hospital settings. Results of this study will also potentially add to our understanding of the mechanisms that drive OCD symptoms, improve our knowledge of psychological treatment mechanisms, and elucidate how biological factors influence psychological treatment outcomes.
Source : Importé depuis le centre
Cognitive Behavioural Therapy (CBT) is a first line psychological treatment for OCD with estimated response rates of between 70-80%. However, there are still a substantial number of treatment non-responders and the vast majority of responders are left with impairing residual symptoms. One new area of investigation that has shown potential benefit for the treatment of OCD has been mindfulness-based interventions (MBIs). This emerging literature provides proof of principle for the delivery and potential efficacy of MBIs for OCD, particularly as an adjunct to CBT, with all studies reporting large (d \> .80) treatment effects. To date, only our teams' small, non-controlled pilot study (N=19) has shown promise for a MBI as a stand-alone treatment for OCD separate from CBT (d = 1.10). However, all results to date for MBI treatments for OCD must be interpreted with caution as they have utilized small, underpowered sample sizes, have not included control groups, and failed to control for potentially confounding variables (e.g., medications, self-initiated exposures). The proposed four-year, two-site randomized controlled trial at two of Canada's leading OCD treatment centres (Sunnybrook Health Sciences Centre and St. Joseph's Healthcare Hamilton) that have been involved in developing and piloting MBI treatments for OCD will aim to test whether a structured, Mindfulness-Based Cognitive Therapy (MBCT) intervention for OCD is an efficacious treatment for a large, heterogeneous sample of DSM-5 (Diagnostic Statistical Manual of Mental Disorders 5th edition) diagnosed OCD participants. The primary aim of this proposed study is to examine whether a developed and piloted MBCT treatment for OCD is efficacious when compared to a waitlist condition and to explore its efficacy compared to CBT treatment for OCD. A secondary aim of the study is to examine the putative treatment mechanisms of MBCT. Past research examining treatment mechanisms in CBT for OCD have focused on the reduction of obsessional beliefs, anxiety sensitivity, and safety behaviours in producing better outcomes. In contrast, the hypothesized mechanisms in MBI treatments include the development of mindfulness skills such as acting with awareness, non-reactivity to and non-judging of inner experience, and reduction in mind wandering. The large-scale, powered RCT (randomized control trial) design will permit the examination of whether MBCT and CBT include overlapping or distinct treatment mechanisms. Treatment outcomes will be assessed with standardized measures of OCD symptomatology, general measures of mood and anxiety, a reliable and valid EEG measure to assess cognitive changes across treatment. If this study can demonstrate that a short-term mindfulness intervention can significantly reduce the suffering associated with OCD, then the findings could easily be translated into routine clinical care in and out of Canadian hospital settings. Results of this study will also potentially add to our understanding of the mechanisms that drive OCD symptoms, improve our knowledge of psychological treatment mechanisms, and elucidate how genetic/biological factors influence psychological treatment outcomes.
Source : Importé depuis le centre
Centres participants
Sites
Centres participants
2
centres
ST. JOSEPH'S HEALTHCARE HAMILTON
Hamilton
ONTARIO, CANADA
Recrutement local
État du recrutement:
FERMÉ
UNIVERSITY OF TORONTO, SUNNYBROOK HEALTH SCIENCES CENTRE - TIER 2 SITE
Toronto
ONTARIO, CANADA
Recrutement local
État du recrutement:
FERMÉ
Source d'information
Dernière modification :
4 mars 2026
Données à jour depuis :
6 mars
Origine des données :
clinicaltrials.gov
