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Acute kidney injury (AKI) is common after hematopoietic cell transplant (HCT). The etiology of AKI is unknown because biopsies are rarely performed. The pathophysiology of injury is inferred from clinical data. Thrombotic microangiopathy (TMA) is often invoked as the cause of renal injury. Patients &gt;2 years old undergoing their first HCT at Fred Hutchinson Cancer Research Center participated in this study. We prospectively measured plasma markers of coagulation activation, (PAI-1 and tPA) and fibrinolyis (D-dimer) weekly in 149 patients during the first 100 days post transplant. Cox proportional hazards modeling was used to determine associations between these markers and AKI (doubling of baseline serum creatinine). Kruskal-Wallis test was used to determine the associations between day 100 urinary albumin to creatinine ratios and these markers. Thirty one percent of patients developed AKI. Though elevations in these markers occurred frequently, neither PAI-1 nor tPA were associated with the development of AKI. D-dimer was associated with a slightly increased risk of AKI (relative risk=1.76; P-value 0.04). None of these markers were associated with micro- or macroalbuminuria at day 100. The lack of an association with AKI suggests that endothelial injury in the form of TMA is not a common cause of AKI early after transplant.

Markers of coagulation activation and acute kidney injury in patients after hematopoietic cell transplantation