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The purpose of this paper is to describe and discuss assessment of post-traumatic stress disorder (PTSD) in adults with intellectual disabilities. Existing research in this area encompasses case studies, and includes, for the most part, persons with mild intellectual disabilities.

The aim of this study is to investigate symptom presentation and subsequent identification of PTSD in persons with more severe intellectual disabilities; i.e. persons with moderate or severe intellectual disabilities. Five patients in a specialised psychiatric inpatient unit for patients with intellectual disabilities were included. Information about the patients was collected through case files and interviews with key informants: family, milieu therapists, and caregivers in community settings, and observations through inpatient admission. The authors of this paper followed a training programme for trauma therapists in addition to the inpatient treatment of the five patients. The five patients all met criteria for PTSD according to the Diagnostic Manual – Intellectual Disability.

Previously, it was not suspected that the five patients suffered from PTSD, although they had experienced terrifying incidents. All patients displayed severe changes in behaviour, which may have overshadowed symptoms of PTSD. PTSD in persons with more severe intellectual disabilities may be interpreted as challenging behaviour, or other psychiatric disorders such as psychosis.

The limitation of the study is the small number of participants.

Practical implication is linked to clinical practice related to identification of PTSD in persons with intellectual disabilities.

The paper may encourage more research into how PTSD can be identified in persons with moderate and severe intellectual disabilities. The case reports may help clinicians to look for traumatic experiences in persons with intellectual disabilities who have experienced terrifying incidents.