Psychotropic drug use following venous thromboembolism versus diabetes mellitus in adolescence or young adulthood: a Danish nationwide cohort study.

Objectives Critical and chronic illness in youth such as diabetes can lead to impaired mental health. Despite the potentially traumatic and life-threatening nature of venous thromboembolism (VTE), the long-term mental health of adolescents and young adults with VTE is unclear. We compared the long-term mental health of adolescents and young adults with VTE versus adolescents and young adults with insulin-dependent diabetes mellitus (IDDM) using psychotropic drug purchase as proxy for mental health. Design Nationwide registry-based cohort study. Setting Denmark 1997-2015. Participants All patients aged 13-33 years with an incident diagnosis of VTE (n=5065) or IDDM (n=6609). Exposure First time primary hospital diagnosis of VTE or IDDM. Primary and secondary outcome measures Adjusted absolute risk and risk difference at 1 and 5 years follow-up for first psychotropic drug purchase comparing patients with VTE and patients with IDDM. Results The absolute 1 year risk of psychotropic drug use was 6.2% among VTE patients versus 3.6% among patients with IDDM, at 5 years this was 19.3%-14.7%, respectively. After adjusting for the effect of sex, age and risk factors for VTE this corresponded to a 1 year risk differences of 1.9% (95 % CI 0.1% to 3.3%). At 5 years follow-up the risk difference was 1.9% (95% CI 0.5% to 3.3%). Conclusion One-fifth of adolescents and young adults with incident VTE had claimed a prescription for a psychotropic drug within 5 years, a risk comparable to that of young patients with IDDM.