Rehospitalization and substance use disorder (SUD) treatment entry among patients seen by a hospital SUD consultation-liaison service

Background: Substance use disorders (SUD) are associated with non-adherence to medical care and high utilization of hospital services. This study characterized patterns and correlates of rehospitalization among patients seen by a hospital-based SUD consultation-liaison (CL) team. Methods: This study was a retrospective medical record review of patients in a large urban academic hospital who received SUD consultation and were diagnosed with opioid, cocaine, and/or alcohol use disorder (N = 267). Data were collected on patient characteristics, substance-specific SUD diagnoses (opioids, cocaine, and alcohol), opioid agonist treatment (OAT) with methadone or buprenorphine (treatment status at admission; in-hospital initiation of OAT), and rehospitalization through 180 days post-discharge. Associations with rehospitalization were examined using bivariate tests of independence and multivariate logistic regression, with patient background and medical characteristics, substance-specific SUD diagnoses, and OAT status (at admission and in-hospital initiation) as predictors. Results: Rehospitalization rates were higher among patients with current opioid (38% vs. 24%; p < .05) and cocaine use disorders (39% vs. 26%; p < .05) compared to patients without these diagnoses. In multivariate logistic regression analysis, the number of medical comorbidities [Adjusted Odds Ratio (AOR) = 1.2; p < .01] and opioid use disorder (AOR = 2.4, p < .05) were independently associated with rehospitalization. Conclusions: In this sample of hospital patients receiving SUD CL services, the risk of rehospitalization differed by type of SUD diagnosis. In -hospital initiation of OAT is promising for facilitating treatment linkage post discharge, but this small study did not show differences in rehospitalization based on OAT initiation. These findings could inform services for hospital patients with comorbid SUDs.