Protein loss and glucose absorption in children with AKI treated with peritoneal dialysis

Background: Protein loss and glucose absorption in children on acute peritoneal dialysis (PD) is important to inform dietary prescription, yet data are lacking in this regard. This study was a secondary analysis of a previously published crossover randomised controlled trial, aiming to describe glucose uptake and protein loss into dialysate among children with acute kidney injury (AKI) receiving PD. Methods: This secondary analysis described and compared dialysate albumin loss and glucose absorption in 15 children with AKI receiving PD or continuous flow peritoneal dialysis (CFPD). In addition, correlations between albumin loss, glucose absorption and other patient and dialysis factors were analysed. Results: Median (range) age and weight of participants were 6.0 (0.2-14) months and 5.8 (2.3-14.0) kg, respectively. Patients received approximately 8 h of dialysis on each modality; however, results were extrapolated and expressed per day. The mean SD albumin loss on conventional PD and CFPD was 0.3 +/- 0.19 g/kg/day and 0.56 +/- 0.5 g/kg/day, respectively, and the mean +/- SD glucose absorption was 4.67 +/- 2.87 g/kg/day and 3.85 +/- 4.1 g/kg/day, respectively. There was a moderate correlation between ultrafiltration and albumin loss during CFPD only (Pearson's R = 0.61; p = 0.02). There were no significant differences between PD and CFPD for either glucose absorption or albumin loss; however, the study was not powered for this outcome. Conclusions: Protein losses and glucose absorption in children on PD with AKI are significant and should be considered when prescribing nutritional content. Protein losses on CFPD were twice as high as on conventional PD.