Risk of obstructive acute kidney injury: derivation and internal validation of a risk stratification tree

The authors aimed to develop and validate a predictive model, the Kidney Injury Tree For Identification of obSTructive Origin (KIT-FISTO), for identifying obstructive acute kidney injury (AKI) in patients presenting to the emergency department. Through a retrospective study, they classified patients into high, moderate, and low-risk categories based on clinical symptoms and history, achieving high sensitivity for low-risk classification. The model shows promise but requires further external and prospective validation before clinical implementation.