Purpose
One criticism of the existing renal trauma research is the limited outpatient follow-up after index hospitalization. We assessed readmission rates following treatment for AAST grade 3 and 4 renal injury using the Comprehensive Hospital Abstract Reporting System (CHARS).
Materials and Methods
We evaluated all patients with AAST grade 3 and 4 renal injuries admitted to Harborview Medical Center (HMC) between 1998–2010, the only level 1 trauma center in Washington state. Grade 4 renal injuries were stratified by collecting system laceration (CSL) or segmental vascular injury (SVI). Data was abstracted from the CHARS database for readmissions to any Washington State hospital within six months of renal injury. Clinical variables, diagnoses, and procedures were queried based on ICD-9 codes.
Results
477 grade 3 and 159 grade 4 renal injuries were initially treated at HMC. On admission, 111 patients required intervention: 75/477 (16%) grade 3 and 36/159 (23%) grade 4 injuries. Within six months of index hospitalization, 86/477 (18%) grade 3 and 38/159 (24%) grade 4 patients were readmitted to any WA state hospital. 80% of grade 3 injuries and 66% of grade 4 injuries returned to HMC compared to secondary hospitals (p=0.08). At readmission, 19/86 grade 3 (22%) and 16/38 grade 4 (42%) injuries had a urologic diagnosis. Subsequent procedural intervention was required on readmission in 6/86 (7%) of grade 3 and 5/38 (13%) of grade 4 renal injuries (all CSL injuries).
Conclusions
A subset of patients treated for grade 3 and 4 renal trauma will be readmitted for further management. While urologic diagnoses and additional procedures may be low overall, readmission to outside hospitals may preclude accurate determination of renal trauma outcomes. Based on these data, patients with grade 4 CSL injuries appear to be at the highest risk for readmission and to require a subsequent urologic procedure.