How does marijuana affect outcomes after trauma in ICU patients? A propensity-matched analysis

Area of Science:

• Trauma Care
• Toxicology
• Critical Care Medicine

Background:

• Marijuana abuse is increasing in adult and adolescent trauma patients.
• Previous studies focused on marijuana's effects on disease outcomes, not trauma-specific mortality.
• This study investigates the link between marijuana use and mortality in trauma patients.

Purpose of the Study:

• To assess the relationship between positive marijuana toxicology screens and mortality in adult trauma patients.
• To analyze differences in outcomes such as ventilator days, ICU, and hospital length of stay.
• To control for confounding factors using propensity score matching.

Main Methods:

• Analysis of adult trauma patients (2008-2012) from the Arizona State Trauma Registry.
• Inclusion of intensive care unit (ICU) patients with positive marijuana screens, excluding other substance use.
• Propensity score matching (1:1) of marijuana-positive to marijuana-negative patients, controlling for age, injury severity, and Glasgow Coma Scale.

Main Results:

• A total of 2,678 matched patients (1,339 marijuana-positive, 1,339 marijuana-negative) were analyzed.
• Marijuana-positive patients had significantly higher rates of mechanical ventilation (55.3% vs. 32%).
• Among ventilated patients, marijuana-positive individuals showed increased ventilator days but a significantly lower mortality rate (7.3% vs. 16.1%).

Conclusions:

• Positive marijuana screening is associated with decreased mortality in adult ICU trauma patients.
• The findings suggest a potential protective effect of marijuana in this population.
• Further investigation into the physiological effects of marijuana in trauma is warranted.