Evaluating Success and Challenges of a Primary Care Youth Mental Health Programme Using Complexity, Implementation Science, and Appreciative Inquiry.

Background Using an innovative framework of complexity and implementation science, with underpinning core values of appreciative inquiry (CIS-A), this paper describes the evaluation of a pilot service in New Zealand aiming to deliver integrated psychological therapy services within primary care, to young people (aged 18-24) experiencing mild to moderate mental distress. Method Using mixed quantitative and qualitative methods and multiple data sources, there was a strong focus on local innovation and co-design with service users, young people and multiple care providers. Data is drawn from service users, stakeholders and providers of the service in three areas of the lower North Island of New Zealand.  Results The Piki pilot provided a significant and innovative enhancement of mental health care to this population. The service supported 5307 individuals with a range of therapy options, with the majority having between one and three therapy sessions. From 730 service users who completed a survey, 591 (81%) were 'very satisfied' with the service provided. The CIS-A framework was used successfully to provide rapid feedback and encourage adaptation to evolving issues. These included unexpected workload pressures, changes to therapy delivery, the integration of co-design and prioritising the needs of vulnerable groups. There was a successful incorporation of youth/service user input to co-design the programme, introduction of a peer-to-peer support service, and integration of a digital resource platform. The framework was also used to address challenges encountered and to support necessary adaptations in response to the COVID-19 pandemic.  Conclusions We describe the use of an embedded evaluation to support and inform the implementation of a novel and innovative youth mental health programme. Complexity and implementation science, underpinned by the core values of appreciative inquiry (CIS-A), were successfully utilised providing potential learning that can be applied locally, nationally and internationally. This study has a focus on youth mental health but the principles and utility of applying a complexity and implementation science approach have application in many different health care settings. The use of a framework such as CIS-A can support complex innovation and implementation and can be used to enable rapid course correction and turn 'hindsight to foresight'.