medical decision support medical decision support
Sign In

Base Deficit Modification of Kroezen et al for the TRISS (Base Excess Injury Severity Scale, BISS)

Purpose: To evaluate a trauma patient using the Base Excess Injury Severity Scale (BISS).

Description

Kroetzen et al modified the TRISS to incorporate the base deficit. This resulted in the BISS (Base Excess Injury Severity Scale). The authors are from St. Elisabeth Hospital (Tilburg) and the University of Utrecht.


Parameters from the TRISS:

(1) age

(2) AIS

 

Parameter dropped from the TRISS:

(1) RTS

 

Parameter added:

(1) delta base deficit (on a sample drawn within 1 hour after admission to the hospital)

 

Measured Base Deficit

Delta Base Deficit

< -2 mmol/L

ABS((base deficit) + 2)

-2 to +2 (normal range)

0

> +2 mmol/L

(base deficit) - 2

 

Using data from the Tilburg database:

 

Parameter

Coefficient or Value

age

-0.046

AIS

-0.082

delta base deficit

-0.096

constant

5.78

 

 

X =

= (-0.046 * (age)) - (0.082 * (AIS)) - (0.096 * (delta base deficit)) + 5.78

 

probability of survival =

= 1 / (1 + EXP((-1) * X)

 

where:

• Age is a continuous variable (page 909) rather than the dichotomous variable in the TRISS.

• The constant in the TRISS is a negative number.

• There do not appear to be different coefficients for penetrating vs blunt trauma.


To read more or access our algorithms and calculators, please log in or register.

Specialty

Objective

ICD-10