Feasibility and Short-Term Effects of Low-Threshold Opioid Substitution Treatment during the COVID-19 Pandemic in Hamburg, Germany.

Introduction: After rapidly opening up a low-threshold clinic to support heavily opioid-dependent persons at the beginning of the COVID-19 pandemic in April 2020 in Hamburg (Germany), this non-interventional study evaluated the feasibility and short-term effects of opioid substitution treatment (OST). The low-threshold concept was customized for the pandemic situation and is the first of its kind in Germany.

Methods: Patients who had already begun treatment were questioned in two assessments, at T1 shortly after beginning treatment and at T2 6 months later. The primary outcome criterion was their quality of life using the OSTQOL. Secondary criteria included retention rate, their mental and physical health (measured by the BSI-18 and the OTI Health Scale), social situation, drug use, COVID-19 status, and satisfaction with treatment.

Results: Out of 84 patients included in the study, 51 participated in both assessments, resulting in a 6-month retention rate of 60.7%. 27.5% were females, and 72.5% were males. The feasibility question of the low-threshold OST clinic can clearly be answered positively. During the course of the study over 6 months, the situation mainly remained stable regarding quality of life, physical and mental health, and days of drug consumption. Patients significantly reduced the time they spent on the drug scene from 8.5 (SD = 7.56) to 6.1 (SD = 6.71) hours a day between the beginning of OST and T2 (p = 0.020). While 56.9% answered to be homeless at the beginning of OST, only 33.3% answered not to have found an accommodation by T2 (p = 0.012). The number of patients having contact to social workers increased from 51.0% to 74.5% (p = 0.004). Almost 2 fifths of the patients took part in PCR testing for COVID-19 (that only being done if they had symptoms), and none of the tests were positive.

Discussion/conclusions: Overall, the low-threshold OST clinic has been successfully implemented in order to help a vulnerable group of people navigate through a global pandemic and support the public health sector. Further conclusions on effects are limited by the short study period and the small number of patients, which calls for further research studies in a larger setting.