High Grade Renal Injuries: Application of Parkland Hospital Predictors of Intervention for Renal Hemorrhage

Purpose: Investigators from Parkland Hospital proposed substratification of the AAST (American Association for the Surgery of Trauma) grading scale based on 3 risk factors, including active vascular extravasation, a medial laceration and a perinephric hematoma of greater than 3.5 cm. We hypothesized that these characteristics would also be associated with intervention for renal hemorrhage in our large trauma series.Materials and Methods: From January 2005 to January 2011 we retrospectively reviewed the renal trauma records at adult level 1 trauma centers in Utah. AAST grade 3 and 4 injuries were characterized based on the mentioned 3 risk factors. Our primary outcome was intervention to control renal hemorrhage.Results: AAST grade 3 or greater injury was identified in 147 patients, including 115 who had grade 3 and 4 injuries as well as imaging available for review. There were 63 grade 3 (53%) and 52 grade 4 (43%) renal injuries. Eight patients (7%) underwent intervention for renal hemorrhage. Vascular ex...