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  • Title: Blunt renal trauma and the predictors of failure of non-operative management.
    Author: Simmons JD, Haraway AN, Schmieg RE, Duchesne JD.
    Journal: J Miss State Med Assoc; 2010 May; 51(5):131-3. PubMed ID: 20812437.
    Abstract:
    OBJECTIVES: While non-operative management of renal trauma in selected patients is now an accepted management option, predictors of failure of this treatment strategy are still unclear. METHODS: Five-year retrospective study of all patients with blunt renal injuries managed non-operatively at a Level I Trauma Center. Abstracted data included patient demographics, initial vital signs, base deficit, associated injuries, use of blood transfusion, management, and outcomes. Patients with successful non-operative management (S-NOM) and failure of non-operative management (F-NOM) were compared with two-tailed Student's t test, Fisher's exact test, or chi-square analysis as appropriate. RESULTS: Over five years, 271 patients out of 12,252 trauma cases (2.2%) had blunt renal injury; 239 (88%) were initially managed non-operatively, and ten (4.1%) of these patients later requiring operation or intervention. No differences in age, sex, initial vitals, or GCS were found between S-NOM and F-NOM. The F-NOM patients were more seriously injured than the S-NOM patients (ISS 31 vs. 21, p < 0.001); had worse acidosis (ABG base deficit of-9.1 vs. -4.5, p < 0.001); required more blood products (12 units PRBC vs. 2.6 units PRBC, p < 0.001); and had significantly longer hospital lengths of stay (37 days vs. 12 days, p < 0.001). Angiography was used more frequently in the F-NOM patients (40% vs. 8.7%, p < 0.02). In the F-NOM only 3 (30%) required direct kidney intervention: 1 nephrectomy, 1 open urinoma drainage and 1 open nephrostomy tube placement. All of these patients had grade V renal injuries. The rest of the F-NOM patients had operative interventions not directly related to their renal injuries: 1 splenectomy and 6 missed bowel injuries. CONCLUSION: Non-operative management of blunt renal injuries is successful in most cases. Patients with a high base deficit, ongoing transfusion requirements, and greater Injury Severity Scores have a higher likelihood of requiring operation, but these procedures most often are to address non-renal abdominal injuries. High-grade blunt renal injuries that are hemodynamically stable can be treated expectantly on an individual basis with close follow-up. Any patient with hemodynamic instability, renal pedicle injury, renal artery thrombosis, or urinary extravasation will likely require operative intervention.
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