A Systematic Review of Trauma and Substance Use in American Indian and Alaska Native Individuals: Incorporating Cultural Considerations.

INTRODUCTION:Disproportionate rates of psychiatric disorders, like substance use and posttraumatic stress disorders (SUD and PTSD), exist among American Indian and Alaska Native (AI/AN) individuals. This review examines substance use and trauma in existing AI/AN literature and utilizes an AI/AN-specific model to culturally inform the relationship between these factors and provide recommendations for future research. METHODS:We searched three databases through April 2021 for peer-reviewed articles that examined substance use and trauma in AI/AN individuals. RESULTS:The search identified 289 articles and of those, 42 were eligible for inclusion, including 36 quantitative and 6 qualitative studies. Rates of lifetime trauma exposure varied from 21 to 98% and were correlated with increased rates of SUDs. A dose response of traumatic events also increased the likelihood of an SUD among reservation-based AI populations. Factors from the Indigenist Stress Coping model included cultural buffers such as traditional healing and cultural identity, which aided in recovery from SUD and trauma, and social stressors like boarding school attendance, discrimination, and historical loss. CONCLUSIONS:SUD and trauma are highly correlated among AI/AN individuals though rates of PTSD are lower than might be expected suggesting resilience. However, this pattern may not be consistent across all AI/AN groups and further research is needed to better explain the existing relationship of SUD and PTSD and relevant historical and cultural factors. Further research is needed to culturally tailor, implement, and validate PTSD and SUD assessments and treatments to ameliorate these health inequities.