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Brief intensive EMDR therapy for PTSD in adults with mild intellectual disability or borderline intellectual functioning and behavioural problems: a multiple baseline design study

Versluis, Anne; de Jongh, Ad; Mevissen, Liesbeth; Schuengel, Carlo; Bakkum, Lianne; Didden, Robert

Brief intensive EMDR therapy for PTSD in adults with mild intellectual disability or borderline intellectual functioning and behavioural problems: a multiple baseline design study Thumbnail


Authors

Anne Versluis

Ad de Jongh

Liesbeth Mevissen

Carlo Schuengel

Lianne Bakkum

Robert Didden



Abstract

Background: Individuals with mild intellectual disability (MID; IQ 50–70) or borderline intellectual functioning (BIF; IQ 70–85) are at an elevated risk of post-traumatic stress disorder (PTSD), with PTSD symptoms possibly associated with behavioural problems. It is important to test the effectiveness of trauma-focused treatments, such as eye movement desensitisation and reprocessing (EMDR) therapy, for adults with MID–BIF, PTSD, and severe behavioural problems.

Objective: To determine the safety and effectiveness of brief intensive EMDR therapy carried out by a team of rotating therapists in adults with MID-BIF, PTSD, and severe behavioural problems.

Methods: Using a randomised non-concurrent multiple baseline between-subjects design, 11 adults with MID-BIF, PTSD, and severe behavioural problems received a maximum of 16 intensive EMDR sessions twice daily for a maximum of two weeks from six different EMDR therapists. Primary outcome measurements included severity of PTSD symptoms, PTSD diagnostic status, and adverse events. Secondary outcome measurements included the frequency and severity of behavioural problems, presence of adaptive behaviour, and the use of involuntary care. Outcome measurements were assessed at baseline, during the intervention and post-intervention phases, and at the follow-up phases, and subject to randomisation tests for statistical significance.

Results: Intensive EMDR therapy carried out by a team of rotating therapists resulted in significant decreases in PTSD symptoms (Mdifference = 15.84, p < .001) with nine of 11 participants no longer meeting the PTSD diagnostic criteria immediately following treatment and at the 9-week follow-up. Randomisation tests revealed no significant changes in adaptive behaviour, frequency, and severity of behavioural problems. Additionally, no decrease in the use of involuntary care measures was observed. One participant dropped out; no adverse events were observed.

Conclusions: Brief intensive EMDR therapy for individuals with MID-BIF and severe behavioural problems, conducted by a team of rotating therapists, can be done safely and effectively to reduce PTSD symptoms.

Journal Article Type Article
Acceptance Date Apr 14, 2025
Online Publication Date May 19, 2025
Publication Date May 19, 2025
Deposit Date Jun 13, 2025
Publicly Available Date Jun 13, 2025
Journal European Journal of Psychotraumatology
Electronic ISSN 2000-8066
Publisher Taylor & Francis Open
Peer Reviewed Peer Reviewed
Volume 16
Issue 1
Article Number 2495642
DOI https://doi.org/10.1080/20008066.2025.2495642

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