Sodium Removal per Ultrafiltration Volume in Automated Peritoneal Dialysis in Pediatric Patients

Abstract

Abstract Background The standard sodium removal in adult anuric patients on continuous ambulatory peritoneal dialysis (CAPD) is 7.5 g/L of ultrafiltration volume (UFV). Although automated PD (APD) is widely used in pediatric patients, no attempt has yet been made to estimate sodium removal in APD. Methods The present, retrospective cohort study included pediatric patients with APD who were managed at Tokyo Metropolitan Children’s Medical Center between July 2010 and November 2017. The patients underwent a peritoneal equilibrium test (PET) at our hospital. Sodium removal per UFV was calculated by peritoneal function and dwell time using samples from patients on APD with 1- and 2-hour dwell effluent within three months of PET and 4- and 10-hour dwell effluent at PET. Results In total, 217 samples from 18 patients were included, with 63, 81, and 73 of the samples corresponding to the High [H], High-average [HA], and Low-average [LA] PET category, respectively. Sodium removal per UFV (g/L in salt equivalent) for dwell times of 1-, 2-, 4-, and 10-hour was 5.2, 8.8, 8.0, and 11.5 for PET [H], 5.3, 5.8, 5.6, and 8.1 for PET [HA], and 4.6, 5.1, 5.1, and 7.1 for PET [LA], respectively. Conclusions Sodium removal per UFV in pediatric APD was less than the standard adult CAPD and tended to be lower with shorter dwell times, leading to sodium accumulation (Na sieving). Otherwise, salt intake should be restricted in combination with daytime CAPD, especially in anuric patients.