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Background Mental health crises cause significant disruption to individuals and families and can be life-threatening. The large number of community crisis services operating in an inter-agency landscape complicates access to help. It is unclear which underpinning mechanisms of crisis care work, for whom and in which circumstances. Aim The aim was to identify mechanisms to explain how, for whom and in what circumstances adult community crisis services work. Objectives The objectives were to develop, test and synthesise programme theories via (1) stakeholder expertise and current evidence; (2) a context, intervention, mechanism and outcome framework; (3) consultation with experts; (4) development of pen portraits; (5) synthesis and refinement of programme theories, including mid-range theory; and (6) identification and dissemination of mechanisms needed to trigger desired context-specific crisis outcomes. Design This study is a realist evidence synthesis, comprising (1) identification of initial programme theories; (2) prioritisation, testing and refinement of programme theories; (3) focused realist reviews of prioritised initial programme theories; and (4) synthesis to mid-range theory. Main outcome The main outcome was to explain context, mechanisms and outcomes in adult community mental health crisis care. Data sources Data were sourced via academic and grey literature searches, expert stakeholder group consultations and 20 individual realist interviews with experts. Review methods A realist evidence synthesis with primary data was conducted to test and refine three initial programme theories: (1) urgent and accessible crisis care, (2) compassionate and therapeutic crisis care and (3) inter-agency working. Results Community crisis services operate best within an inter-agency system. This requires compassionate leadership and shared values that enable staff to be supported; retain their compassion; and, in turn, facilitate compassionate interventions for people in crisis. The complex interface between agencies is best managed through greater clarity at the boundaries of services, making referral and transition seamless and timely. This would facilitate ease of access and guaranteed responses that are trusted by the communities they serve. Strengths and limitations Strengths include the identification of mechanisms for effective inter-agency community crisis care and meaningful stakeholder consultation that grounded the theories in real-life experience. Limitations include the evidence being heavily weighted towards England and the review scope excluding full analysis of ethnic and cultural diversity. Conclusions Multiple interpretations of crises and diverse population needs present challenges for improving the complex pathways to help in a crisis. Inter-agency working requires clear policy guidance with local commissioning. Seamless transitions between services generate trust through guaranteed responses and ease of navigation. This is best achieved where there is inter-agency affiliation that supports co-production. Compassionate leaders engender staff trust, and outcomes for people in crisis improve when staff are supported to retain their compassion. Future work Further work might explore inter-agency models of crisis delivery, particularly in rural communities. Future work could focus on evaluating outcomes across crisis care provider agencies and include evaluation of individual, as well as service-level, outcomes. The implementation and effect of mental health triage could be explored further, including via telehealth. Barriers to access for marginalised populations warrant a specific focus in future research. Study registration The study is registered as PROSPERO CRD42019141680. Funding This project was funded by the National Institute for Health and Care Research (NIHR) Health and Social Care Delivery Research programme and will be published in full in Health and Social Care Delivery Research; Vol. 11, No. 15. See the NIHR Journals Library website for further project information. Plain language summary The issue A mental health crisis can be traumatic for individuals and families. There are a lot of different agencies delivering crisis care. This can make getting the right help from services difficult, confusing and slow. It is not clear which services work best or who they work best for. What we did This research explored community mental health crisis services for adults. We focused on what is working, who it is working for and in what situations it is working. Service users, carers, mental health professionals and service managers formed an ‘expert stakeholder group’ to guide the project by helping the researchers make sense of what we learned. We gathered information from research reports, other documents and interviews with experts (i.e. service users, carers, professionals, managers). We focused on three questions: How can services make sure that people in crisis can get the right help, quickly? What makes crisis care compassionate? Does it help if different crisis services work together? What we learned Community crisis services are most compassionate and effective when staff from different organisations share information. When leaders of crisis care help staff to work together across services, they find better ways to help people. Close working across teams gives professionals a better understanding of what other services do and makes it easier for them to give people the right help at the right time. When leaders are kind and supportive to staff, they feel better at work and provide better crisis care. What future work can be done It would be useful to explore if the most effective crisis services are the same ones that service users like best. We need to know more about mental health triage, inter-agency working and telehealth. Our project did not explore diversity, but this is an important topic to investigate. Scientific summary Background Mental health crises cause significant disruption to the lives of individuals and families and can be life-threatening. The drive for community care alongside large reductions in hospital beds has led to a proliferation of community crisis services delivered by a diverse range of provider agencies, contributing to difficulties for people in navigating to timely crisis support. There is no single definition of a mental health crisis; people have diverse needs, resulting in a large variation in routes into and through mental health crisis care. Service users report unmet need. Services have diversified quickly in response to reported gaps and delayed responses, and continue to do so. Diversification has led to geographic differences in available crisis care and created a complex web of agencies with different values, referral processes, interventions and access thresholds. It is unclear, in this complex system, which underpinning mechanisms of crisis care are most effective, for whom and in which circumstances. Aim The aim was to identify mechanisms to explain how, for whom and in what circumstances mental health community crisis services for adults work to resolve crises, with a view to informing current and future intervention design and development. Objectives Use stakeholder expertise, current practice and research evidence to develop programme theories to explain how different crisis services work to produce the outcome of resolution of mental health crises. Use a context, intervention, mechanism and outcome (CIMO) framework to construct a sampling frame to identify subsets of literature within which to test programme theories. Iteratively consult, via an expert stakeholder group (ESG) and individual interviews, with diverse stakeholders to test and refine programme theories. Identify and describe pen portraits of UK crisis services that provide exemplars of the programme theories to explain how mental health crisis interventions work in order to explore and explain contextual variation. Synthesise, test and refine the programme theories, and, where possible, identify mid-range theory, to explain how crisis services work to produce the outcome of resolution of the crisis. Provide a framework for future empirical testing of theories in and for further intervention design and development. Produce dissemination materials that communicate the most important mechanisms needed to trigger desired context-specific crisis care outcomes, to inform current and future crisis care interventions and service designs. Design A four-phase realist evidence synthesis, reported in accordance with Realist And Meta-narrative Evidence Syntheses: Evolving Standards (RAMESES) reporting guidelines and comprising (1) identification of candidate programme theories from academic and grey literature; (2) iterative consultation with an ESG and individual interviews to prioritise, test and refine programme theories; (3) focused realist reviews of prioritised theory components; and (4) synthesis to mid-range theory. Main outcome measures The principal aim of the review was to generate and test programme theories, and then synthesise these with mid-range theory, to explain what works, for whom and in what circumstances in adult mental health community crisis care. Data sources The following were conducted: Google Scholar (Google Inc., Mountain View, CA, USA) searches to identify initial programme theories and logic models, focused searches of academic databases with backward citation searching, grey literature searches and hand-searches by the research team and expert stakeholders to test and refine three theory components. An ESG, with membership from lived experience, health professional, social care, policy expertise, health management and commissioning, was consulted on four occasions across the life of the research to test and refine theories and to connect them with real-world experience. Twenty individual realist interviews were conducted with 19 participants to further test, refine and sense-check theory components where there were gaps in topic expertise or theory; the 19 participants included service users; health, social care, ambulance and police professionals; and research and policy experts. Analysis A realist evidence synthesis with stakeholder primary data was used to test and refine three initial programme theories in adult mental health community crisis care: (1) urgent and accessible crisis care, (2) compassionate and therapeutic crisis care and (3) inter-agency working. Data analysis involved using realist logic to identify initial programme theories (objectives 1–3), and testing and refining the programme theories through a focused review of the literature, to extract and configure explanatory causal relationships between CIMO (objectives 3–5). Expert stakeholder consultations supported analysis through linking theories to real-world experience, enabling exploration and explanation of contextual variation as it related to putative mechanisms (objectives 3–5). Individual interviews with experts, who were purposively selected for their topic expertise related to the programme theory components, were deductively analysed according to the CIMO framework. An inductive process identified any new mechanisms not identified from other data sources (objective 3). Pen portraits were developed as illustrative exemplars of the link between CIMO and were refined in collaboration with expert stakeholders (objective 4). Findings from the focused review of the three theory components were synthesised with mid-range theories to produce a framework for any future empirical testing that may be developed (objective 5). Results The scope of the realist review was refined through an initial consultation and discussion between the ESG and the research team. A Diamond-9 prioritisation process was used to facilitate discussion between the ESG and the research team and to refine the scope of the review. This process resulted in three initial programme theories for testing, focused on (1) urgent and accessible crisis care, (2) compassionate and therapeutic crisis care and (3) inter-agency working. The findings from the three focused reviews were synthesised with mid-range theory. Mental health crisis care is provided by a complex array of agencies, each with different definitions of crises, different values about the nature of interventions and different approaches to prioritisation. This is further complicated by multiple overlapping service boundaries. What is apparent is that these differences can only be accommodated within an inter-agency system in which information and decisions are shared from commissioning through to front-line delivery. Inter-agency working provides mechanisms that trigger seamless service delivery through improved communication and collaboration. For this system to work, representation from all agencies and stakeholders is needed. National co-ordination at policy level ensures that investment is appropriately targeted and that important strategic aspirations are met. National co-ordination should steer, but not dictate, local configurations of the agencies needed. Local crisis services should be configured to meet the crisis care needs of local populations within their geography, taking account of any marginalised individuals or communities they serve. Commissioning for inter-agency working needs a focus on managing complex boundaries and transitions across agencies to avoid gaps and disputes. Attention is also needed on how the inter-agency crisis system engages with wider systems important to resolution of crises, including, for example housing, police, local authority, safeguarding and the justice system. The ultimate aim of inter-agency system should be that there is no wrong door through which to access mental health crisis care, and, once in a service, navigation should be facilitated via a single trusted point of liaison. Evaluation is not restricted by organisational boundaries and aims to provide data that take account of how the whole inter-agency system is operating. Conceptualisations of crises as single events or as the sole responsibility of statutory secondary mental health systems are unhelpful and generate fragmentation, leading to gaps and delays for those seeking crisis care and frustration for leaders and front-line staff. The perception of whether or not a service and service providers are accessible carries more of an inhibitive effect than the way that the service is actually organised. People experiencing a crisis choose to access services they perceive as providing a guaranteed response, that are easy to navigate to and that fit with their definition of the crisis. Although the timing of responses in relation to outcomes remains unclear, what is clear is that people feel safer and have a reduced sense of urgency when they trust services. Trust is established through compassionate interactions and proactive management of transitions and waiting. Involvement of the person and their family or support network in decisions supports a sense of trust and relational safety, which may help meet a need for continuity for some. To sustain compassion, front-line staff need access to support for themselves, as well as resources to deliver crisis care that meets their personal and professional ideals. Training in the knowledge, skills and values required for compassion can build confidence among front-line staff in all agencies. System leaders must provide resources and communicate an expectation for compassionate engagement so that it becomes the norm for staff to seek support. This is achieved in an inter-agency context when there is interpersonal contact between all levels of worker, from commissioning through to front-line delivery, that facilitates learning, communication and appreciation of different roles. Furthermore, co-production of crisis care can be facilitated within the inter-agency system, enabling crisis care to be recognised and valued by the community it serves. Service users perceive a crisis when they feel overwhelmed and anxious and when they perceive that they lack a sense of control. Familiar contacts and a safe environment, coupled with reassurance, can help to shape their perception of the service, but, more importantly, can help to reduce distress, thereby mitigating risk and making it more likely that a service user is able to respond to suggested strategies. With an emphasis on rapport and compassion, professionals are encouraged to exhibit positive behaviours that mitigate against the dehumanisation and stigma that service users may perceive when they encounter a service, and which may precipitate or exacerbate a crisis. Compassion shown to front-line staff by leaders leads to compassionate care. A tension between exerting control and providing support was evident at all levels. As integrated care systems are introduced, there is an aspiration that strategic partnerships will reduce competing priorities, which appear debilitating to organisations. Alongside these strategic partnerships, there is a need for coherent local strategies for compassionate and psychologically safe crisis care cognisant of the fact that high-quality care can coexist alongside the worst examples of care in the same organisation. Strategies should include how compassionate and psychologically safe crisis care is provided. Different values and definitions of crisis are accommodated, allowing challenge and debate to become accepted as an opportunity to drive quality improvement. Strengths and limitations Much of the literature was descriptive; therefore, the evidence base was limited. The programme theories identified outline the mechanisms needed to facilitate the best inter-agency community crisis care. Meaningful consultation with expert stakeholders grounded the theories in the reality of community crisis care, although UK evidence is heavily weighted towards England. Project delivery was affected by the COVID-19 pandemic, reducing the number of individual interviews and delaying stakeholder consultations. Stakeholder consultation did not reach as wide a group as originally intended. Conclusion Community crisis care is likely to continue to be delivered by a complex array of agencies responding to a heterogeneous population that presents with different mental health concerns and perceptions of crisis. Inter-agency working provides a platform for seamless transitions between services and timely responses. To deliver desired outcomes, inter-agency working requires continual systems of engagement locally and nationally involving all providers of crisis care through compassionate leadership, sharing of values and shared understanding of systems. Compassion is central and begins with leaders who can influence the culture of crisis organisations. Compassionate leadership is focused on people over systems, enabling front-line staff to retain their compassion and hope, and to work collaboratively across agencies, and it provides a platform for shared decision-making and co-production. All of this helps people in crisis to recognise the service as designed for them and to have trust in community crisis services. The study achieved its objectives, despite unexpected difficulties resulting from the effects of the COVID-19 pandemic, owing to an agile and committed research team, flexible and accommodating stakeholders and support from the funders. Project milestones were adjusted to accommodate the changing context of the study. Future work A framework of programme theories synthesised with mid-range theory developed from this study can inform future research that seeks to develop better mental health crisis care systems. Further work might explore how inter-agency service configurations work, including how telehealth interventions are perceived by service users and how these interventions produce optimal outcomes. Evaluation of crisis care for marginalised groups is needed. The implementation and effect of mental health triage could be explored further. Meaningful engagement with expert stakeholders could be incorporated routinely into research design and delivery. Mental health triage appears to be a promising approach, but has a limited evidence base. Future research could explore and test the implementation and effect of mental health triage systems. This work could focus on different values about prioritisation and how these can be accommodated within an inter-agency system. Further exploration of models of crisis care to mitigate barriers to access for those with substance use or alcohol use problems, personality disorders, physical health conditions and autistic spectrum disorders is needed. Inter-agency models of crisis care are causally linked to optimal crisis outcomes. A focused realist evaluation is needed to explore in more depth the factors influencing access to, and transition through, crisis care for these populations. These outcomes are at times theoretical and have been subjected to limited testing in primary research. UK inter-agency crisis service models provide an opportunity for mixed-method case study approaches to evaluation. A neglected area of focus for this research is the efficacy of models for rural populations. Crisis interventions involving police and mental health services have a growing body of evidence; however, there is a lack of evidence for co-response models involving ambulance paramedic staff or emergency control rooms. There is a lack of focus on individual recovery outcomes. This review highlights the importance of mechanisms such as psychological and relational safety, compassion and trust in producing optimal crisis outcomes. Research is needed to develop evaluation approaches to measure the presence and impact of these mechanisms in crisis care. Data from the literature and from engagement with stakeholders (via the ESG and individual interviews) were combined to refine the realist programme theory/ies to identify key mechanisms that might operate across multiple interventions to ‘trigger’ an appropriate treatment response, and contexts related to these key mechanisms that might enhance or detract from intervention success. Meaningful co-production with service users and other expert stakeholders enhances the relevance of research and should be incorporated routinely into research design and delivery. Study registration The study is registered as PROSPERO CRD42019141680. Funding This project was funded by the National Institute for Health and Care Research (NIHR) Health and Social Care Delivery Research programme (NIHR127709) and will be published in full in Health and Social Care Delivery Research; Vol. 11, No. 15. See the NIHR Journals Library website for further project information.

AT THE END of January 2004, a team of nurse researchers from the RCN Institute, London, and the school of nursing and midwifery at the University of Sheffield completed a [...]

We have developed 0.1- \mu \textm gate-length InAlN/GaN high electron-mobility transistors (HEMTs) for millimeter-wave (MMW) power applications, particularly at 71–76 and 81–86 GHz bands. The impacts of depth and width of the gate recess groove on electrical performance have been analyzed and compared. Competing passivation technologies, atomic layer deposition (ALD) aluminum oxide (Al2O3) and plasma-enhanced chemical vapor deposition (PECVD) SiN, have also been assessed in terms of dc, pulsed- $IV$ , and high-frequency characteristics. It has been found that while PECVD SiN-passivated HEMTs and the monolithic microwave integrated circuits slightly underperform their ALD Al2O3-passivated counterparts, their MMW power performance can be further boosted with the gate recess due to the improved aspect ratio and scaling characteristics. When biased at a drain voltage of 10 V, a first-pass two-stage power amplifier design based on recessed PECVD SiN-passivated 0.1- \mu \textm depletion-mode devices has demonstrated an output power of 1.63 W with a 15% power-added efficiency at 86 GHz. [ABSTRACT FROM PUBLISHER]