Innovative strategies and implementation science approaches for health delivery among migrants in humanitarian settings: A scoping review

Over 100 million displaced people rely on health services in humanitarian contexts, defined as unstable or transitory settings created in response to complex emergencies. While services are often described, there is a dearth of evidence on best practices for successful implementation to guide efforts to optimize health delivery. Implementation science is a promising but underutilized tool to address this gap. This scoping review evaluates implementation science in health services for forced migrants in humanitarian settings. We conducted a scoping review according to JBI methodologies. A search of eight databases yielded 7,795 articles, after removal of duplicates, that were screened using PRISMA-ScR guidelines. Data extraction assessed study descriptors, implementation objects, barriers, facilitators, implementation strategies, and use of implementation frameworks in service delivery. Data from 116 studies represented 37 countries and 11 topic areas. Methods were mainly cross-sectional with low-medium evidence rigor. Mental health programs (25%) and vaccination services (16%) were the most common objects of implementation. Thirty-eight unique barriers were identified including resource limitations (30%), health worker shortages (24%), and security risks (24%). Among 29 facilitators, the most common were health worker availability (25%), pre-existing partnerships (25%), and positive perceptions towards the intervention (20%). More than 90% of studies collectively identified 35 implementation strategies, the most common being capacity building (44%), stakeholder engagement (35%), information dissemination (38%), and feedback mechanisms (25%). Only 10 studies used formal implementation models, with RE-AIM (n = 3) and Intervention mapping (n = 2) being most frequent. In this scoping review, we found similar barriers, facilitators, and implementation strategies across diverse humanitarian migrant settings and services. However, the use of rigorous methods and formal implementation models was rare. Frameworks included RE-AIM, CFIR, and Precede-Proceed. Increased use of implementation science frameworks and methods will help humanitarians more rigorously and systematically evaluate and develop best practices for implementation of health services for migrants in humanitarian settings.