Limitations of the TRISS method for interhospital comparisons: a multihospital study

Area of Science:

• Traumatology
• Health Services Research

Background:

• The Trauma and Injury Severity Score (TRISS) is a widely used method for comparing trauma care outcomes across different institutions.
• Accurate interhospital comparisons are crucial for quality improvement initiatives in trauma care.

Purpose of the Study:

• To evaluate the utility of the TRISS method for interhospital comparisons of trauma care.
• To identify specific limitations of the TRISS method in diverse patient populations and injury patterns.

Main Methods:

• Analysis of data from 5,616 trauma patients across eight healthcare facilities (three trauma centers, five community hospitals).
• Utilized Z-scores to compare observed mortality rates against TRISS-predicted rates.
• Documented specific patient subgroups and injury types where TRISS demonstrated limitations.

Main Results:

• Identified three key limitations of the TRISS method: 1) lack of homogeneity in penetrating injuries (gunshot vs. stab wounds), 2) inability to accurately predict survival for low-fall injuries, and 3) failure to account for multiple severe injuries to a single body region.
• The first two limitations may be addressable with modifications within the existing TRISS framework.

Conclusions:

• The TRISS method requires refinement to enhance its accuracy for interhospital trauma care comparisons.
• Addressing limitations related to injury homogeneity and specific injury types is necessary.
• A novel methodology may be required to adequately account for multiple severe injuries to a single body part.