Literature Collection

IMPORTANCE: People experiencing homelessness have been disproportionately affected by the opioid overdose crisis. To mitigate morbidity and mortality, several office-based addiction treatment (OBAT) programs designed for this population have been established across the US, but studies have not yet evaluated their outcomes. OBJECTIVE: To evaluate treatment retention and mortality in an OBAT program designed specifically for individuals experiencing homelessness with opioid use disorder (OUD). DESIGN, SETTING, AND PARTICIPANTS: A retrospective cohort study was conducted in the Boston Health Care for the Homeless Program (BHCHP). Participants included all adult patients (N = 1467) who had 1 or more OBAT program encounter at BHCHP from January 1 through December 31, 2018. Data analysis was conducted from January 13 to December 14, 2020. EXPOSURES: Sociodemographic, clinical, and addiction treatment-related characteristics were abstracted from the BHCHP electronic health record. MAIN OUTCOMES AND MEASURES: The primary outcome was all-cause mortality, identified by linkage to the Massachusetts Department of Public Health vital records. Multivariable Cox proportional hazards regression analyses were performed to evaluate baseline and time-varying variables associated with all-cause mortality. Secondary addiction treatment-related outcomes were abstracted from the electronic health record and included (1) BHCHP OBAT program retention, (2) buprenorphine continuation and adherence verified by toxicology testing, and (3) opioid abstinence verified by toxicology testing. RESULTS: Of 1467 patients in the cohort, 1046 were men (71.3%) and 731 (49.8%) were non-Hispanic White; mean (SD) age was 42.2 (10.6) years. Continuous retention in the OBAT program was 45.2% at 1 month, 21.7% at 6 months, and 11.3% at 12 months. Continuous buprenorphine adherence was 41.5% at 1 month, 17.6% at 6 months, and 10.2% at 12 months, and continuous opioid abstinence was 28.3% at 1 month, 6.1% at 6 months, and 2.9% at 12 months. The all-cause mortality rate was 29.0 deaths per 1000 person-years, with 51.8% dying from drug overdose. Past-month OBAT program attendance was associated with lower mortality risk (adjusted hazard ratio, 0.34; 95% CI, 0.21-0.55). CONCLUSIONS AND RELEVANCE: Mortality rates were high in this cohort of addiction treatment-seeking homeless and unstably housed individuals with OUD. Although continuous OBAT program retention was low, past-month attendance in care was associated with reduced mortality risk. Future work should examine interventions to promote increased OBAT attendance to mitigate morbidity and mortality in this vulnerable population.

Opiate addiction is a serious global health issue that profoundly impacts the welfare of populations around the world. Opioid addiction affects an estimated 1.9 million individuals in the United States alone, stimulating a rise in treatment options such as medication-assisted treatment with buprenorphine. When combined with counseling and relapse prevention groups, medication-assisted treatment has proven to be an effective office-based opioid treatment for opiate dependence. Office-based opioid treatment has broadened access to treatment of opioid dependence, has decreased the risk for overdose, and is effective for reducing cravings and opioid use at proper dosing levels. However, treatment retention and relapse remain significant challenges. The purpose of this study was to identify characteristics predictive of retention in treatment time of opioid-dependent individuals receiving office-based buprenorphine treatment. The records of individuals enrolled in a public health office buprenorphine clinic (n = 350) were analyzed to determine retention time in treatment and whether retention time varied by selected individual variables. Participants in the study had a cumulative predicted retention time on buprenorphine of 65% at 30 days, 35% at 6 months, 25% at 12 months, and 18% at 18 months.

OBJECTIVE: The authors conducted a scoping review to survey the evidence landscape for studies that assessed outcomes of treating patients with opioid use disorder with methadone in office-based settings. METHODS: Ovid MEDLINE and the Cochrane Database of Systematic Reviews were searched, and reference lists were reviewed to identify additional studies. Studies were eligible if they focused on methadone treatment in office-based settings conducted in the United States or other highly developed countries and reported outcomes (e.g., retention in care). Randomized trials and controlled observational studies were prioritized; uncontrolled and descriptive studies were included when stronger evidence was unavailable. One investigator abstracted key information, and a second verified data. A scoping review approach broadly surveyed the evidence, and therefore study quality was not rated formally. RESULTS: Eighteen studies of patients treated with office-based methadone were identified, including six trials, eight observational studies, and four additional articles discussing use of pharmacies to dispense methadone. Studies on office-based methadone treatment, including primary care-based dispensing, were limited but consistently found that stable methadone patients valued office-based care and remained in care with low rates of drug use; outcomes were similar compared with stable patients in regular care. Office-based methadone treatment was associated with higher treatment satisfaction and quality of life. Limitations included underpowered comparisons and small samples. CONCLUSIONS: Limited research suggests that office-based methadone treatment and pharmacy dispensing could enhance access to methadone treatment for patients with opioid use disorder without adversely affecting patient outcomes and, potentially, inform modifications to federal regulations. Research should assess the feasibility of office-based care for less stable patients.