Objectives
To identify factors associated with adolescent emergency department (ED) visits for substance abuse, including those complicated by mental health (dual diagnosis), and to analyze their effect on ED length of stay (LOS) and disposition.
Methods
We performed a secondary analysis of ED visits by adolescents (aged 11-24) using the National Hospital Ambulatory Medical Care Survey (1997-2010), identifying visits for mental health, substance use, and dual diagnosis. Univariate and multivariate statistics were used to analyze demographic and visit-level factors, factors associated with substance use and dual diagnosis visits, and the effects of substance use and mental health conditions on emergency department LOS and disposition.
Results
Substance use and mental health accounted for 2.1% and 4.3% of all adolescent visits, respectively, with 20.9% (95% confidence interval [CI] 18.3-23.5%) of substance abuse visits complicated by mental health. Factors significantly associated with substance use include: male gender, urban location, West region, ambulance arrival, night and weekend shift, anxiety disorders, mood disorders, and psychotic disorders. Additional LOS was 89.77 minutes for mental health, 71.33 minutes for substance use, and 139.97 minutes for dual diagnosis visits, as compared to visits where these conditions were not present. Both mental health and substance use were associated with admission/transfer as compared to other dispositions: mental health, odds ratio (OR) 5.93 (95% CI 5.14-6.84), illicit drug use, OR 3.56 (95% CI 2.72-4.64), and dual diagnosis, OR 6.86 (95% 4.67-10.09).
Conclusions
Substance abuse and dual diagnosis are common among adolescent ED visits and are strongly associated with increased use of prehospital resources, emergency department length of stay, and need for hospitalization.