Abstract
Background
Pediatric patients on maintenance hemodialysis (HD) are at risk of both malnutrition and fluid overload. This pilot study aimed to assess correlates of normalized protein catabolic rate (nPCR) in adolescents on chronic HD, in particular fluid status markers.
Methods
All patients aged 10–18 years on chronic HD in our center between 2017 and 2019 were enrolled. For each patient, mean nPCR was calculated and correlations with the following parameters investigated: dry body weight change in subsequent 3 months in kg (∆BW) and percentage of BW (∆BW%), change in body mass index (∆BMI), preHD systolic and diastolic blood pressure (SBP, DBP), residual urine output, biochemistry, and blood volume monitoring–derived first hour refill index (RI), calculated as ratio between ultrafiltration rate and reduction in relative blood volume in first hour of dialysis.
Results
Seventy-nine nPCR determinations were collected in 23 patients, median age 14.8 years. nPCR significantly correlated with ∆BW, ∆BW%, ∆BMI, spKT/V, and preHD serum creatinine, and negatively correlated with age, DBP SDS (r=−0.466, p=0.025) and RI (r=−0.435, p=0.043). RI was significantly higher in patients with nPCR <1 than those with nPCR above this threshold: 3.2 (1.9–4.7) vs. 1.4 (0.7–1.8) ml/kg/h/% (p=0.021). At multivariable analysis, nPCR remained positively correlated with creatinine and spKt/V, and inversely correlated with RI.
Conclusions
nPCR is a significant predictor of weight change in adolescents on maintenance HD, and seems associated with creatinine and dialysis adequacy. Inverse correlation with RI suggests possible associations between malnutrition and fluid overload, but larger prospective studies are needed to confirm this.
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FP and SC contributed to the study conception and design. Data collection was performed by FP, SC, MA, and OC. Data analysis was performed by FP. The first draft of the manuscript was written by FP and revised by SC, MB, OC, MRG, and GM. Each author contributed important intellectual content during manuscript drafting or revision. All authors read and approved the final manuscript.
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The study was approved by the local Institutional Review Board and conformed to the Declaration of Helsinki.
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Paglialonga, F., Consolo, S., Brambilla, M. et al. Nutritional status and volume control in adolescents on chronic hemodialysis. Pediatr Nephrol 36, 3733–3740 (2021). https://doi.org/10.1007/s00467-021-05089-6
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DOI: https://doi.org/10.1007/s00467-021-05089-6