• David Hui, Zoe M Weinstein, Debbie M Cheng, Emily Quinn, Hyunjoong Kim, Colleen Labelle, and Jeffrey H Samet.
• Boston University School of Medicine, 72 East Concord St., Boston, MA 02118, United States. Electronic address: davidhui@bu.edu.
• J Subst Abuse Treat. 2017 Aug 1; 79: 12-19.

IntroductionPatients with opioid use disorder often require multiple treatment attempts before achieving stable recovery. Rates of disengagement from buprenorphine are highest in the first month of treatment and termination of buprenorphine therapy results in return to use rates as high as 90%. To better characterize these at-risk patients, this study aims to describe: 1) the frequency and characteristics of patients with very early disengagement (≤1month) from Office Based Opioid Treatment (OBOT) with buprenorphine and 2) the frequency and characteristics of patients who re-engage in care at this same OBOT clinic within 2years, among the subset of very early disengagers.MethodsThis is a retrospective cohort study of adult patients enrolled in a large urban OBOT program. Descriptive statistics were used to characterize the sample and the proportion of patients with very early (≤1month) disengagement and their re-engagement. Multivariable logistic regression models were used to identify patient characteristics associated with the outcomes of very early disengagement and re-engagement. Potential predictors included: sex, age, race/ethnicity, education, employment, opioid use history, prior substance use treatments, urine drug testing, and psychiatric diagnoses.ResultsOverall, very early disengagement was unusual, with only 8.4% (104/1234) of patients disengaging within the first month. Among the subset of very early disengagers with 2years of follow-up, the proportion who re-engaged with this OBOT program in the subsequent 2years was 11.9% (10/84). Urine drug test positive for opiates within the first month (AOR: 2.01, 95% CI: 1.02-3.93) was associated with increased odds of very early disengagement. Transferring from another buprenorphine prescriber (AOR: 0.09, 95% CI: 0.01-0.70) was associated with decreased odds of very early disengagement. No characteristics were significantly associated with re-engagement.ConclusionsEarly disengagement is uncommon; however, continued opioid use appeared to be associated with higher odds of treatment disengagement and these patients may warrant additional support. Re-engagement was uncommon, suggesting the need for a more formal explicit system to encourage and facilitate re-engagement among patients who disengage.Copyright © 2017 Elsevier Inc. All rights reserved.

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