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Testing adaptations to contingency management for alcohol use disorders: A randomized controlled trial.

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Contingency management (CM) modifications did not improve alcohol use outcomes for adults with alcohol use disorder (AUD). However, participants showed reduced alcohol consumption during CM compared to baseline, with heavy drinkers responding less favorably.

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Area of Science:

  • Addiction Medicine
  • Behavioral Psychology
  • Clinical Trials

Background:

  • Alcohol Use Disorder (AUD) is a chronic relapsing condition.
  • Contingency Management (CM) is an evidence-based behavioral intervention for AUD.
  • Predicting nonresponse to CM is crucial for tailoring treatment.

Purpose of the Study:

  • To evaluate modified CM interventions for adults with AUD and high baseline urine ethyl glucuronide (uEtG) levels.
  • To assess if intervention modifications improve response rates in non-responders to standard CM.
  • To investigate the impact of pre-intervention heavy drinking on CM effectiveness.

Main Methods:

  • 158 adults with AUD and serious mental illness were randomized to usual, high-magnitude, or shaping CM.
  • Urine ethyl glucuronide (uEtG) levels were used to monitor alcohol abstinence and define heavy drinking (≥500 ng/mL).
  • Primary outcome was the proportion of uEtG-negative samples during the intervention period.

Main Results:

  • No significant differences in CM effectiveness were found across the three intervention groups.
  • Participants demonstrated reduced alcohol use during CM compared to the induction period (4.2 times more likely to submit uEtG-negative samples).
  • Individuals with pre-intervention heavy drinking (uEtG ≥500 ng/mL) were less likely to achieve abstinence during CM.

Conclusions:

  • Modified CM interventions did not enhance alcohol use reduction in this high-risk AUD population.
  • CM, in general, led to reduced alcohol consumption compared to baseline.
  • Pre-intervention heavy drinking patterns identified distinct response trajectories to CM.