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Home > Articles > TRISS: Trauma - Injury Severity Score

Introduction

TRISS determines the probability of survival (Ps) of a patient from the ISS and RTS using the following formulae:

Where 'b' is calculated from:


The coefficients b0 - b3 are derived from multiple regression analysis of the Major Trauma Outcome Study (MTOS) database. AgeIndex is 0 if the patient is below 54 years of age or 1 if 55 years and over. b0 to b3 are coefficients which are different for blunt and penetrating trauma. If the patient is less than 15, the blunt coefficients are used regardless of mechanism.

 BluntPenetrating
b0-0.4499-2.5355
b10.80850.9934
b2-0.0835-0.0651
b3-1.7430-1.1360

TRISS Calculator

The TRISS calculator determines the probability of survival from the ISS, RTS and patient's age. ISS and RTS scores can be inputted independently or calculated from their base parameters.

ISS CALCULATOR
AIS Scores:
Head
Face
Chest
Abdomen
Extremity
External

 
ISS:

 
RTS CALCULATOR
 
Systolic BP
Resp. Rate
Coma Score

 
RTS:

 
TRISS
 
Age
 
 
Probability of Survival:
Blunt
Penetrating
 

The TRISS Calculator will open as a
standalone window on your desktop.

References

Boyd CR, Tolson MA, Copes WS: "Evaluating Trauma Care: The TRISS Method", J Trauma 27:370-378;1987

Trianalytics Inc: http://www.trianalytics.com

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