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Background: Posttraumatic stress disorder (PTSD) is common in patients with personality disorders. This comorbidity is accompanied by a lower quality of life, and a higher risk of suicide attempts than patients with only one of these diagnoses. Objective: The aim of this systematic review and meta-analysis was to evaluate the scientific evidence of the efficacy of PTSD treatments for this population. Method: A literature search was performed from 1946 through June 2020. Standardized mean effect sizes of psychotherapy for PTSD were computed. Results: The literature search revealed that psychotherapy was the only intervention that was systematically explored. Fourteen studies were included. In 12 of these studies solely patients with borderline personality disorder participated. Analysis of the four RCTs showed a significant, moderate to high standardized effect size for reducing PTSD symptom severity (Hedges’ g = 0.54), with effects being maintained at least 3 months (Hedges’ g = 0.82). Effect sizes for all studies were also significant, with moderate to high standardized values for symptoms of PTSD (Hedges’ g = 1.04). PTSD improvements were again maintained at 3-month follow-up and beyond (Hedges’ g = 0.98). In addition, a significant decrease in symptoms of depression, anxiety, borderline symptoms, and PTSD in patients with borderline personality disorder could be revealed for all studies (Hedges’ g 0.48–1.04). No increase in self-injurious behaviour, suicide attempts, or hospitalization was observed, while the mean weighted dropout rate during PTSD treatment was 17%. Conclusions: Psychotherapy for PTSD is efficacious and safe for patients with borderline personality disorder and should not be withheld from these vulnerable individuals.

Background: Trauma and posttraumatic stress disorder (PTSD) are prevalent in patients with personality disorders. Despite the established efficacy of eye movement desensitisation and reprocessing (EMDR) for PTSD, EMDR has barely been examined in patients with comorbid PTSD and personality disorders. Objective: The aim of this study was to explore what changes occur in symptom severity of PTSD, dissociative symptoms, insomnia, non-suicidal self-injurious behaviour and auditory verbal hallucinations in patients with personality disorders during treatment with EMDR. Method: This uncontrolled open feasibility study on EMDR for PTSD was an addition to treatment-as-usual for personality disorders. The outcome measures were the severity of PTSD symptoms, dissociation, insomnia, non-suicidal self-injury, and auditory verbal hallucinations. Results: Forty-seven participants (22 with a borderline personality disorder, 25 with other personality disorders) were included. A significant reduction in the severity of symptoms of PTSD, dissociation and insomnia was observed after EMDR treatment (median of four sessions), and 40% of the participants scored below the threshold for PTSD diagnosis. No differences in efficacy were found between patients with borderline personality disorder and other personality disorders. EMDR treatment was completed by 68% of the participants. Conclusions: The addition of EMDR techniques to treatment, as usual, may be beneficial in the treatment of PTSD in patients with personality disorders in order to reduce symptoms of PTSD, dissociation and insomnia. Although one-third of these patients did not complete the additional EMDR treatment, no severe complications (e.g. suicidal behaviour or hospitalisation) occurred. Controlled studies are needed to further investigate the validity of these findings.