Association of Psychiatric Services Referral and Attendance Following Treatment for Deliberate Self-harm With Prospective Mortality in Norwegian Patients.

Importance: Psychiatric care following somatic treatment for deliberate self-harm (DSH) is pivotal in patients' lives both in the short and long term, but evidence to guide such care is limited. Objective: To examine follow-up psychiatric care for patients treated for DSH (ie, intentional self-injury or self-poisoning, irrespective of motivation) at hospital emergency departments and to assess the association of psychiatric referral and treatment attendance with risk of subsequent mortality in these patients. Design, Setting, and Participants: Retrospective data from several Norwegian registries were interlinked to follow up a national cohort of all patients with hospital-treated DSH for up to 11 years from 2008 through 2018. Data were analyzed from March to October 2021. Exposures: Socioeconomic characteristics, psychiatric history, and clinical features of DSH. Main Outcomes and Measures: Referral to psychiatric services, attendance in psychiatric treatment, and prospective mortality were the 3-stage outcomes during follow-up. Logistic regression with odds ratios and cause-specific survival analysis with hazard ratios were used to examine associations between exposures and outcomes. Results: The study identified 43 153 patients (24 286 [56.3%] female; median [IQR] age at index DSH, 39.0 [23.0-56.0] years) involving 69 569 DSH episodes. Of these patients, 6762 (15.7%) were referred to psychiatric services after somatic treatment for DSH, and 22 008 patients (51.0%) attended psychiatric treatment within 3 months of discharge following somatic treatment for DSH. Prior psychiatric history and psychiatric disorders comorbid with DSH were associated with both referral to and attendance in psychiatric care. During follow-up, 7041 patients died by suicide (n = 911) or other causes (n = 6130). While suicide risk was associated with male sex, age 35 to 64 years, and particularly prior and coexisting psychopathologies, other-cause mortality was associated with age 65 years and older and socioeconomic disadvantage. Patients with psychiatric referrals generally had an increased risk of suicide, but the risk was particularly high among patients who received a referral but did not subsequently attend psychiatric treatment (adjusted hazard ratio, 3.07; 95% CI, 2.28-4.12). The observed association was more pronounced during the first years of follow-up and in patients aged 10 to 34 years or 35 to 64 years and those with a clear intent of self-harm. Conclusions and Relevance: This national cohort study found an association between psychiatric care attendance following treatment for DSH and prospective mortality, highlighting the importance of patient engagement in psychiatric treatment.