ABSTRACT Background Managing patients' mental state deterioration in acute hospital settings is a critical challenge, requiring prompt specialised intervention to mitigate adverse outcomes. Current responses vary widely across health systems. Integrating rapid response systems that incorporate mental health expertise offers a promising approach to reduce risks and adverse outcomes. Aims To evaluate how a response system manages patient mental state deterioration in acute hospital settings, focusing on the mechanisms driving system effectiveness, for whom it works and under what circumstances, using a realist‐informed theory‐testing approach with field observation. Methods We conducted non‐participant field observations in one trauma and one surgical unit over 4 months to examine the contexts, mechanisms and outcomes shaping a mental state deterioration response system. Observations captured multidisciplinary interactions, escalation processes and decision‐making. Structured field notes were thematically coded using a realist framework to refine program theories and identify key factors influencing timely intervention. Results Twenty responses were observed, most in the trauma unit. The system worked best when bedside nurses escalated early signs of deterioration, prompting timely intervention. Multidisciplinary collaboration involving nurse unit managers, liaison psychiatry, doctors and allied health professionals activated mechanisms of integrated assessment and coordinated care, enabling both medical and mental health needs to be addressed. Competing medical acuity demands at times reduced system availability. Teleconferencing supported specialist input when in‐person attendance was not possible, ensuring person‐centred care. Conclusion System functioning depended on early risk communication by bedside nurses and proactive multidisciplinary collaboration. Organisational support and staff training are essential to address operational challenges. Findings provide evidence for strengthening response systems to deliver timely, comprehensive interventions that improve physical and mental health outcomes. Implications for the Profession and/or Patient Care DIvERT (De‐escalation, Intervention, Early, Response, Team) is a proactive rapid response model of care piloted to improve the management and outcomes of patients experiencing mental state deterioration in acute hospital settings. The model achieves this through structured escalation pathways, proactive interventions and coordinated multidisciplinary collaboration to integrate medical and mental health care. Strengthening organisational support and staff training further reduces reliance on restrictive practices and promotes safer, person‐centred care. Impact What problem did the study address? Acute hospitals face persistent challenges in responding to patient mental state deterioration alongside medical acuity, with existing rapid response systems often insufficiently integrated with mental health expertise. What were the main findings? Field observations of the DIvERT model demonstrated that proactive integration of mental health expertise, supported by organisational investment in training, clear escalation protocols and multidisciplinary collaboration, enabled earlier intervention and more coordinated responses. Where and on whom will the research have an impact? These findings have implications for acute hospital services, informing system‐level improvements to rapid response models that support patient safety, reduce adverse events and improve staff wellbeing. Reporting Method This study adhered to the relevant EQUATOR guidelines. Specifically, reporting followed the RAMESES II (Realist And Meta‐narrative Evidence Syntheses: Evolving Standards II) reporting standards, which provide criteria for transparent and rigorous reporting of realist evaluation methodology. Patient or Public Contribution No patient or public contribution.
Dziruni et al. (Tue,) studied this question.