Identifying Optimal Thresholds for Early Opioid Use Frequency in Predicting Buprenorphine Outcomes

Area of Science:

• Addiction Medicine
• Pharmacotherapy
• Clinical Trials

Background:

• Early identification of nonresponse to buprenorphine treatment for opioid use disorder is crucial for improving patient outcomes.
• Opioid use within the initial weeks of treatment is a known predictor of later outcomes, but specific frequency thresholds remain unclear.

Purpose of the Study:

• To identify optimal thresholds for early opioid use frequency that predict sustained opioid use.
• To quantify the association between these early use thresholds and continuous treatment outcomes, including retention and opioid-free weeks.

Main Methods:

• Analysis of data from 562 participants across two clinical trials of buprenorphine treatment.
• Utilized receiver operating characteristic (ROC) curve analyses to determine optimal thresholds for opioid frequency in the first 4 weeks predicting sustained use (weeks 5-12).
• Employed negative binomial regressions to assess the relationship between early nonresponse indicators and opioid-free and retention weeks.

Main Results:

• Predicting sustained opioid use was optimized by identifying at least 1 day of opioid use in the first 2 weeks (PPV=0.524, NPV=0.856) or at least 2 days of use in the first 3 weeks (PPV=0.611, NPV=0.834).
• Both identified thresholds for early opioid use were significantly associated with fewer opioid-free weeks and lower treatment retention.

Conclusions:

• Very low levels of opioid use in the initial 2-3 weeks of buprenorphine treatment are significant indicators of potential poor long-term outcomes.
• Emphasizing early abstinence or near-abstinence may enhance long-term treatment stability for opioid use disorder.
• The identified thresholds can aid clinicians in identifying at-risk patients who may require adjusted treatment plans and closer monitoring.