[Comment les services d'intervention précoce pour la psychose peuvent-ils mieux servir les migrants, les minorités ethniques et les populations autochtones ?]

Objectives To synthesize the available epidemiological and clinical evidence relevant to the mental health care of migrant, ethnic minority and Indigenous populations in the context of early psychosis. Methods This study provides a narrative review of the literature on psychosis in these populations, including issues related to the provision of early intervention services for psychosis. Results Migrant status has long been reported as a significant risk factor for psychosis in many geographic contexts. This increased risk among migrants seems to persist beyond the first generation and has been found to be higher in all migrant populations, but especially for black ethnic minorities and individuals migrating from economically developing countries to developed ones. Recent evidence suggests that this higher risk is at least in part due to migrants' and minorities' cumulative exposure to social adversities, such as racial discrimination, marginalization and socio-economic disadvantage. Systemic racism affects migrant and minority populations by creating bias in diagnostic practices and aggravating treatment disparities in addition to contributing to causation of psychosis. Furthermore, migrant and ethnic minority groups are known to seek mental healthcare after longer delays, to be more frequently forcibly hospitalized, to disengage from treatment prematurely and to be less satisfied with their treatment. The consideration of social and cultural context and factors is essential to the provision of good healthcare, especially in a culturally diverse society. Furthermore, acknowledging power relationships that stem from the societal context and shape institutions and models of care is a key step towards structural competence and safety in mental healthcare. Several strategies have been proposed to make mental healthcare services and systems more culturally and structurally competent. These include the use of interpreters and cultural brokers, tailored assessments and specialised cultural interventions. However, these strategies have yet to be adopted broadly in early intervention for psychosis. Conclusion Given its emphasis on meaningful engagement and person-centered care, early intervention should integrate inclusive, structurally competent and context-informed interventions as a priority. Efforts must be made to apply knowledge from and adapt the tools of social and cultural psychiatry to the field of early intervention in psychosis. Sociocultural considerations, hitherto inconsistently applied in psychosis research and service design in Quebec, are especially relevant to the province given its distinct linguistic context, its increasing cultural diversity, and its ongoing effort to systematize and expand the delivery of early intervention services.