50% of the patients with a systolic blood pressure <90 mmHg at the time of presentation failed to be treated conservatively. Also, trauma due to motor vehicle accidentand the presence of associated injuries to other organs were significantpredictors in our study. When we analyzed the patients withisolated renal injury we found that all 33 patients (20 with grade IIIand 13 with grade IV) were successfully managed conservatively,and that only 8 (24.2%) patients, all with grade IV, required bloodtransfusion.
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