Substance consumption and intoxication patterns in a medically supervised overdose prevention program for people...

Area of Science:

• Public Health
• Emergency Medicine
• Addiction Medicine

Background:

• Opioid overdose is a leading cause of death among homeless individuals.
• Co-ingestion of psychoactive substances, particularly sedatives, with opioids significantly elevates overdose risk.
• Understanding intoxication patterns is crucial for targeted harm reduction interventions.

Purpose of the Study:

• To characterize distinct intoxication patterns among individuals presenting to a drop-in center for overdose risk.
• To identify predictors of these intoxication patterns, focusing on substance use.
• To examine the association between intoxication patterns and clinical outcomes.

Main Methods:

• K-means cluster analysis of vital signs and sedation levels from 305 care episodes.
• Multinomial logistic regression to identify predictors of cluster membership.
• Regression models to assess outcomes associated with cluster membership.

Main Results:

• Three intoxication patterns were identified: mild sedation (Cluster A), sedation with bradycardia/hypotension (Cluster B), and sedation with hypoxia (Cluster C).
• Use of non-opioid sedatives predicted membership in Clusters B and C.
• Cluster C episodes were longer and more likely to require supplemental oxygen compared to Cluster A.

Conclusions:

• Non-opioid sedative use is a significant predictor of more severe intoxication requiring medical intervention.
• Low-threshold, ambulatory medical monitoring effectively manages most overdose risk episodes.
• Harm reduction programs incorporating medical monitoring can reduce severe outcomes and healthcare costs.