The American Association for the Surgery of Trauma Organ Injury Scale for Spleen Does Not Equally Predict Interventions in Penetrating and Blunt Trauma.

Background: The American Association for the Surgery of Trauma (AAST) Organ Injury Scale (OIS) for the spleen (and other organs) was created in 1989. It has been validated to predict mortality, need for operation, length of stay (LOS), and intensive care unit (ICU) LOS.

Purpose: We aimed to determine if the Spleen OIS is applied equally to blunt and penetrating trauma.

Research Design/study Sample: We analyzed the Trauma Quality Improvement Program (TQIP) database from 2017-2019, including patients with spleen injuries.

Data Collection: Outcomes included the rates of mortality, operation, spleen-specific operation, splenectomy, and splenic embolization.

Results: 60900 patients had a spleen injury with an OIS grade. Mortality rates increased in Grades IV and V for both blunt and penetrating trauma. In blunt trauma, the odds for any operation, spleen-specific operation, and splenectomy increased, for each increase in grade. Penetrating trauma showed similar trends in grades up to grade IV, but were statistically similar between grade IV and V. Splenectomy was higher in penetrating trauma for all grades. Splenic embolization peaked at 25% of grade IV trauma before decreasing in grade V. Rates in penetrating trauma were significantly lower in all grades, peaking at 2.5% of Grade III injuries.

Conclusions: The mechanism of trauma is a significant factor for all outcomes, independent of AAST-OIS. Hemostasis is predominantly surgical in penetrating trauma, achieved with angioembolization more frequently in blunt trauma. Penetrating trauma management is influenced by the potential for injury to peri-splenic organs.