Although formal treatments like antidepressants and psychotherapy may effectively reduce depression in nursing home residents, side effects and poor treatment adherence are common. To improve depression care, it is important to also learn from informal strategies already used successfully in daily practice, alongside or in absence of formal treatment. For example, although not prescribed as formal treatment, a care provider may seat a resident with depression at a table near the window. This may have antidepressant effects due to extra day light or pleasant views from the window.

To identify, categorize, and prioritize informal antidepressant strategies for residents already used in daily practice as reported by residents themselves, their relatives, and professional caregivers.

In the first Group Concept Mapping study, residents, relatives, and professional caregivers (N = 124) brainstormed on strategies to prevent or improve depression that may be performed by residents themselves. In the second study, the same participants (N = 110) reported on strategies others involved in residents’ lives could perform. In a second round of both studies, participants rated the expected effectiveness (N = 54, N = 51 respectively) and feasibility (N = 50 for both studies) of the strategies mentioned. In addition, strategies for both studies were sorted based on similarity in meaning by experts.

Six clusters appeared for actions to be undertaken by residents themselves, and five clusters for actions by others. The results showed that, for strategies by residents, the clusters ‘Being socially connected’ and ‘Participating in activities’, and for strategies by others, the cluster ‘Offering personal attention’ stand out the most in terms of high expected effectiveness. The cluster with strategies executed by residents that stood out as the most feasible was ‘Having a healthy living environment’. The most feasible clusters performed by others were ‘Offering personal attention’, ‘Using positive treatment/approach’, and ‘Using or adapting the physical environment’.

By using an innovative bottom-up participatory approach, this research shed light on various clusters of useful informal antidepressant strategies for daily practice. To test effectiveness and implementation, research is needed on these antidepressant strategies and their regular use in care.

Interpersonal trauma and post-traumatic stress disorder (PTSD) in patients with severe mental illness (SMI) negatively affect illness course. Narrative exposure therapy (NET) is effective in vulnerable patient groups, but its efficacy and applicability has not been studied in out-patients with SMI.

We aimed to evaluate the efficacy and applicability of NET in SMI on changes in PTSD, dissociation, SMI symptoms, care needs, quality of life, global functioning and care consumption.

The study had a single-group, pre-test–post-test, repeated-measures design and was registered in The Netherlands National Trial Register (identifier TR571). Primary outcomes were assessed at pre-treatment (T0), 1 month post-treatment (T1) and 7 months’ follow-up (T2), with a structured interview for PTSD and dissociation screening. Secondary outcomes followed routinely SMI measurements and medical data. Mixed models were used for data analysis.

The majority of the 23 participants was female (82%). Mean age was 49.9 years (s.d. 9.8) and mean PTSD duration was 24.1 years (s.d. 14.5). Mean PTSD severity decreased from 37.9 at T0 to 31.9 at T1 (−6.0 difference, 95%CI −10.0 to −2.0), and decreased further to 24.5 at T2 (−13.4 difference, 95%CI −17.4 to −9.4). Dissociation, SMI symptoms, duration of contacts, and medication decreased; global functioning increased; and quality of life and perceived needs did not change. Eleven participants were in remission for PTSD at T2, of which five were also in remission for major depression.

NET appeared efficacious and applicable to out-patients with SMI and PTSD, and was well tolerated.