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  • Title: Bioimpedance Spectroscopy-Based Fluid Status in Combined Dialysis Compared With Hemodialysis and Peritoneal Dialysis: A Cross-Sectional Study.
    Author: Tanaka M, Ishibashi Y, Hamasaki Y, Kamijo Y, Idei M, Nishi T, Takeda M, Nonaka H, Nangaku M, Mise N.
    Journal: Ther Apher Dial; 2020 Aug; 24(4):373-379. PubMed ID: 31626730.
    Abstract:
    Combination therapy with peritoneal dialysis and hemodialysis (PD+HD) is widely used in Japan for PD patients with decreased residual renal function. However, fluid status in PD+HD patients has not been well studied. In this cross-sectional study, we compared fluid status in 41 PD+HD patients with that in 103 HD and 92 PD patients using the bioimpedance spectroscopy. Extracellular water normalized to patient height (NECW, kg/m) was the highest in pre-HD (8.3 ± 1.6) followed by PD (7.9 ± 2.7), PD+HD (7.5 ± 2.5), and post-HD patients (6.9 ± 1.5) (P < 0.01). By multiple linear regression analysis, PD+HD was associated with a significantly lower NECW than pre-HD (β = -0.8, P = 0.03) and similar to PD (β = -0.5, P = 0.24) and post-HD (β = 0.6, P = 0.08) after adjustment for age, sex, diabetic nephropathy, ischemic heart disease, dialysis period, and daily urine volume. There was no correlation between NECW and daily urine volume in all dialysis groups. Average daily fluid removal (a sum of urine volume and ultrafiltration volume by dialysis) was positively correlated with NECW in PD+HD and pre-HD, but not in PD and post-HD patients. Our results suggest that fluid status in PD+HD patients with decreased residual renal function is acceptable as compared with that in HD and PD patients.
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