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Group schematherapy for patients with addiction and comorbid personality disorder. A mixed-methods pilot study of feasibility and clinical potential

Group schematherapy for patients with addiction and comorbid personality disorder. A mixed-methods pilot study of feasibility and clinical potential - Group schematherapy for patients with addiction and personality disorder.

Status
Recruiting
Phases
Phase 2
Study type
Interventional
Source
NL-OMON
Registry ID
NL-OMON56878
Enrollment
Unknown
Registered
2024-07-10
Start date
2024-09-03
Completion date
Unknown
Last updated
2026-03-09

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

stoornis in middelengebruik addiction substance abuse

Interventions

Prior to the group sessions, during the baseline phase, participants will have three weekly pre-sessions with one of the group therapists to develop a global case conceptualization, creating a model

Sponsors

De Grift (verslavingszorg, Arnhem)
Lead Sponsor

Eligibility

Age
18 Years to 99 Years

Inclusion criteria

Inclusion criteria: Participating patients, based on patients* record information: - Diagnosed with one or more substance use disorders according to DSM-5 criteria. - Active Substance Use Disorder treatment, at least during groupschematherapy - Personality Disorder according to DSM-5 criteria (or working hypotheses) - Age between 18 and 70 years - At least partial control over substance use; that is, participants can attend sessions sober. - Written informed consent.

Exclusion criteria

Exclusion criteria: based on information from the patients* record there is no evidence of: - Inadequate proficiency in the Dutch language. - Severe, untreated ADHD symptoms due to overlapping features with a personality disorder. - Psychotic disorder (except for brief reactive psychoses consistent with the Personality Disorder). - Neurocognitive functional impairments. - Bipolar disorder. - Significant substance use without a desire to achieve abstinence. - IQ lower than 80

Design outcomes

Primary

MeasureTime frame
Main study parameter/endpoint The feasibility of GST will be explored and expressed qualitatively in terms of: 1. Descriptions of the nature of obstacles and facilitators experienced by participants, as assessed at one-week post-intervention follow-up in a semi-structured interview based on the Patients Perceptions of Corrective Experiences in Individual Therapy interview protocol (PPCEIT). 2. Participating therapists' experiences regarding the treatment program, suggestions for improvement and recommendations for further implementation, as assessed during a focus group interview after the data collection in participating clients has been completed. If a participating therapist decides to stop participating in the study early, he/she will be contacted for an individual interview regarding his/her experiences with GST. The feasibility of GST will be explored and expressed quantitatively in terms of: 1. The average number (and SD + range) of ST and GST sessions missed. 2. The number of participants who dropout from treatment (absence of 30% or more of the GST sessions (nine or more of total GST sessions missed) is considered a treatment dropout. It is then assumed that a patient has missed too many and that this negatively affects the effect of therapy. 3. Protocol adherence: after each GST session, participating therapists are required to write down the extent to which they adhered to the treatment manual and, if not, how they deviated and the reason. The data from this will be used as talking points for the focus group interview

Secondary

MeasureTime frame
Changes in quantitative outcomes of weekly repeated measures (from baseline (T0), over the course of treatment (T1-T4)), with regard to the potential clinical efficacy of GST: -Average substance use (in grams (drugs) or units (alcohol)) in the past week, assessed with the MATE, section 1. -Average craving in the past week, assessed with the MATE-Q1. Changes in quantitative outcomes of periodic repeated measures (from baseline (T0), over the course of treatment (T1-T4) and follow up (T5)), with regard to the potential clinical efficacy of GST: -Severity and treatment needs of addiction, assessed with the MATE-1. -Quality of life, assessed with the WHOQoL-BREF . - Severity indices in personality problems, assessed with the SIPP-SF -The 16 core beliefs (early maladaptive schemas), assessed with the YSQ-S3. -Schema modes, assessed with the SMI. Other parameters in this study will be assessed in: The severity and type of childhood trauma experienced, assessed with the CTQ (baseline only).

Countries

Netherlands

Outcome results

None listed

Source: NL-OMON (via WHO ICTRP) · Data processed: Mar 14, 2026