Abstract
The USA has some of the highest utilization rates of the Emergency Department (ED) worldwide, leading to increased healthcare costs, constrained resources, and fragmented care. Many of the highest ED utilizers are persons experiencing homelessness (PEH) and those with mental health conditions, with even higher use by those with comorbid social challenges. This study reviewed the literature assessing interventional approaches in the ED to minimize the burden of ED utilization by PEH with associated mental health conditions. We first conducted an informal literature review of high ED utilizers and their most common presenting symptoms. We then conducted a scoping review of articles according to the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) guidelines; we used PubMed and Web of Science databases as well as Google Scholar. We screened the titles and abstracts of studies that evaluated programs that aimed to reduce ED usage by patients with mental illness who were also experiencing homelessness. Of the 1574 titles and abstracts screened, 49 full texts were examined for eligibility. Of those, 35 articles were excluded for a final count of 14 included studies. We found that the studies fell under two main interventional categories: housing support and care management. There were various approaches to reduce ED visits from PEH with mental illness around the world. Overall, these studies found varying degrees of success in reducing ED visits for both housing intervention and care management strategies. Comparison of these studies reveals that the success of related strategies like housing support often have different outcomes which can be attributed to the differences between the populations studied, previously available community resources, and other psychosocial factors affecting study participants. Overall, the most successful studies found that a tailored approach that addresses the unique needs of participants had the greatest impact on reducing ED visits and hospitalizations. Further research is needed to determine the best strategies for specific populations and how to promote health equity among PEH with associated mental health conditions.