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  • Title: Sodium removal and peritoneal dialysis modalities: no differences with optimal prescription of icodextrin.
    Author: Fourtounas C, Dousdampanis P, Hardalias A, Vlachojannis JG.
    Journal: Artif Organs; 2013 Jul; 37(7):E107-13. PubMed ID: 23461737.
    Abstract:
    Continuous ambulatory peritoneal dialysis (CAPD) has been considered as a more efficient modality for sodium removal than automated peritoneal dialysis (APD), due to the longer dwell times and the sodium sieving phenomenon. However, because studies regarding sodium removal in peritoneal dialysis (PD) report rather controversial results and carry various methodological flaws, it remains uncertain whether they offer enough significant information regarding PD prescription and therapy. The aim of the present observational cross-sectional study was to evaluate the impact of the optimal prescription of CAPD and APD, regarding solute clearances and daily ultrafiltrate, on daily sodium removal. Forty-six (46) patients aged 52.3 ± 14 years were studied. Twenty-six (26) patients were subjected to CAPD, and 20 patients were subjected to APD. Ten (10) patients per group were prescribed icodextrin for the long dwell to achieve optimal adequacy and ultrafiltration (UF) targets. CAPD patients removed a higher, albeit not statistically significant, daily amount of sodium (131.7 ± 98.2 mmol) compared with APD patients (79.4 ± 129.2 mmol). Their Kt/V urea was lower (1.48 ± 0.3 vs. 2.17 ± 0.33, P < 0.05), and there were no differences on daily UF (1119 ± 533 vs. 1005 ± 517 mL). In both groups, icodextrin use for the long dwell resulted in equal sodium removal with that of patients not prescribed icodextrin. Our results, derived from an unselected PD population, indicate that although classic CAPD may be more efficient for sodium removal than APD, the use of icodextrin as an adjuvant for higher daily UF not only increases solute clearance but also removes more sodium for both modalities. In addition, calculations of sodium removal in PD do not seem to benefit the everyday clinical practice, provided that PD patients can achieve the adequacy targets and present optimal daily UF without signs of volume overload.
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