Acute kidney injury (AKI) is a condition that affects a very high percentage of people worldwide, and late detection of the condition increases mortality. Utilizing current AKI biomarkers in LMICs is difficult. New data suggests that renin may function as a kidney damage biomarker that can overcome the constraints of creatinine-based diagnostics.
Methods: In Uganda, two study populations were evaluated. 600 children with severe malaria (SM) were included in Cohort #1, a prospective cohort research conducted over two sites. A prospective cohort study called Cohort #2 enrolled 185 sickle cell disease (SCD) patients who were hospitalized for a vasoocclusive crisis.When the children in both cohorts were admitted to the hospital, the quantities of plasma or serum renin were determined using Luminex® (Luminex Corporation, Austin, Texas, United States) or an enzyme-linked immunosorbent assay (ELISA), respectively. Using receiver operating characteristic curves, we evaluated the ability of renin to distinguish between children with or without AKI as well as between children who survived and those who died.
Results: Renin concentrations were significantly correlated with mortality and AKI in both groups. With an area under the curve (AUC) of 0.70 (95%CI, 0.65-0.74) in children with SM and 0.72 (95%CI, 0.6co3-0.81) in children with SCD, Renin was able to distinguish between children with and without AKI.Renin and urine neutrophil gelatinase-associated lipocalin (NGAL), the primary biomarker of AKI used in Cohort #2, performed similarly in terms of differentiating AKI and predicting mortality.
Conclusions: Renin was highly related with AKI and mortality in two different populations of children at risk of AKI, with important differences in the etiology of kidney injury. Renin also showed a moderate to good diagnostic performance to predict mortality.