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Aims and Objectives To explore the process of change within the clinical practice of nurses in mental health inpatient units in the context of a participatory process to improve the nurse–patient therapeutic relationship. Design Participatory Action Research. Methods Ninety‐six nurses from 18 mental health units participated. Data were collected through focus groups and reflective diaries between March 2018 and January 2020. Data were analysed using inductive content analysis. The COREQ guidelines were used. Results The research process was carried out through two cycles of four stages each in which the nurses were able to identify the facilitating and limiting elements of their practice in relation to the therapeutic relationship. They then proposed two consensual improvement strategies for all the units, which they called reserved therapeutic space and postincident analysis. Finally, they implemented and evaluated the two strategies for change. Conclusions This study has shown that, despite the different cultural and structural realities of the participating units, it is possible to implement a collaborative process of change, provided the needs and expectations of both the participants and the organisations are similar. Relevance to Clinical Practice The results obtained through Participatory Action Research were directly transferred to clinical practice, thus having an impact on individual nurses and patients, as well as on the collective dynamics of the teams and aspects related to the management of the units. No Patient or Public Contribution Patient or public input is not directly applicable to this study. Patients were recipients of the changes that were occurring in the nurses as part of their daily clinical practice.

BACKGROUND: The practice environment influences the quality of care and the nursing outcomes achieved in their workplaces. OBJECTIVE: To examine the perception of the clinical practice environment among nurses working in mental health units in the context of their participation in an action research study aimed at improving the nurse–patient relationship. METHOD: An explanatory sequential mixed methods study was designed. The data were collected in three phases in 18 mental health units ( n = 95 nurses). Quantitative data were collected through the Practice Environment Scale of the Nursing Work Index, and qualitative data were collected through reflective diaries and focus groups in the context of participatory action research. RESULTS: The nurses’ assessment of their practice environment shifted from positive to negative. Nurse manager leadership was the aspect that worsened the most. In addition, the perception of their participation in the affairs of the center and nursing foundations for quality of care decreased. The nurses considered it essential to be able to influence decision-making bodies and that the institution should promote a model of care that upholds the therapeutic relationship in actual clinical practice. CONCLUSIONS: Nurses perceived that they should be involved in organizational decisions and required more presence and understanding from managers. Furthermore, nurses stated that institutions should promote nursing foundations for quality of care. This study contributes to understanding how nurses in mental health units perceive their work environment and how it affects the improvement of the nurse–patient relationship in clinical practice.

Aims:To identify and synthesize evidence on the use of action research methods in mental health nursing care.Design: Systematic review.Data Sources: CINAHL, Web of Science, PubMed and Scopus databases were searched in January 2021.Review Methods: Data were selected using the updated Preferred Reporting Items for Systematic Reviews and Meta-Analysis framework. Two reviewers independently conducted the study selection, and quality appraisal using Joanna Briggs Institute Critical Appraisal Checklist for Q ualitative Research, data extraction and data analysis procedures.Results: Sixteen studies, half of which used participatory action research, were included in this review. Nurses, along with other stakeholders, were an active part of the action research process. The main topics of interest addressed were categorized as improving the adoption of a person-centred approach to care and improving decisionmaking procedures. The use of action research helped the participants to identify the meaning they attached to the topic of interest to be improved. Moreover, this method helped to identify needs and strategies for improving care. The studies concurred that the use of action research enabled participants to gain awareness, improve attitudes and acquire knowledge. In addition, it enabled participants to gain confidence and security in the group context, as key aspects of their empowerment. Conclusion:This review shows the usefulness of action research in any mental health nursing context, contributing to the improvement of care at both the individual and collective levels.Impact: This paper demonstrates the use of the action research method in the field of mental health nursing. Its use has improved the clinical practice of nurses as well as that of teams in both community and hospital settings, addressing issues of the person-centred approach to care and decision-making procedures.