Predictors of hospital admission for patients presenting with psychiatric emergencies: A retrospective, cohort study

Background: Rising psychiatric visits represent a significant and growing burden for emergency departments (EDs) across Canada. For individual psychiatric conditions, there are likely a variety of demographic and social variables that may increase risk of resource intensive hospital admission. Methods: We conducted a retrospective cohort study of all patients admitted into inpatient psychiatric units from two EDs in Kingston, Ontario, Canada from 2015 to 2018. We collected demographic and social variables from an electronic ED information system inclusive of all patients presenting to the ED with a mental health or addictions-related chief complaint. We used multivariate logistic regression models to identify predictors of psychiatric admission. Results: A total of 23,814 patients (49.1% male, median age 33) were identified. Admitted patients (n=1838) tended to be older (49 vs. 31 years), have lower Canadian Triage Acuity Scale scores (2.6 vs. 3.0), arrive by ambulance (51% vs. 35%) or police (18% vs. 9%), and have longer lengths of stay (8.4 vs. 4.9 hours). Individuals with mood and psychotic disorders were more likely to require a hospital admission. Conclusion: A variety of clinical and demographic variables increased the risk of hospital admissions for individuals with a variety of psychiatric disorders.