Defining Mild Traumatic Brain Injury: From Research Definition to Clinical Practice.

Area of Science:

• Trauma Surgery
• Neurology
• Emergency Medicine

Background:

• Mild traumatic brain injury (mTBI) accounts for 75% of TBIs, yet lacks a universal definition.
• Disparate definitions from CDC, ACRM, VA/DoD, EAST, and BIG hinder consistent treatment guidelines.
• This study addresses the need for a standardized mTBI definition in acute care.

Purpose of the Study:

• To compare the diagnostic performance of various mTBI definitions.
• To evaluate the ability of different guidelines to accurately classify mTBI patients.
• To assess the impact of mTBI definitions on patient classification and healthcare efficiency.

Main Methods:

• Retrospective cohort study of 596 blunt TBI patients (GCS 13-15) at a Level I trauma center.
• Comparison of mTBI definitions based on sensitivity, specificity, PPV, NPV, overtriage, and undertriage rates.
• Inclusion of a cost-savings analysis.

Main Results:

• CDC/ACRM definitions showed 100% sensitivity but 0% specificity, with high undertriage and mortality.
• The BIG definition identified more patients than EAST and VA/DoD, with better positive predictive value and lower undertriage.
• BIG demonstrated superior performance over CDC/ACRM in balancing sensitivity and specificity.

Conclusions:

• The BIG definition identifies more mTBI patients than VA/DoD and EAST, with improved overtriage/undertriage rates compared to CDC/ACRM.
• BIG enhances patient safety by reducing undertriage and improves healthcare efficiency by minimizing overtriage.
• Implementing the BIG definition could yield significant annual cost savings ($395K-$401K) at a Level 1 trauma facility without increasing mortality.