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Factors effective on peritoneal phosphorus transport and clearance in peritoneal dialysis patients

Clinical Nephrology, ISSN: 0301-0430, Vol: 87, Issue: 2, Page: 76-83
2017
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Aims: Transport characteristics of phosphorus are different from other small solutes that are evaluated in routine peritoneal equilibration test (PET) in peritoneal dialysis (PD) patients. We aimed to evaluate peritoneal phosphorus clearance and permeability, and their relationship with peritoneal membrane transport type and creatinine clearance as well as factors affecting peritoneal phosphorus clearance. Methods: 70 adult patients on a PD program were included in our study. Phosphorus transport status was classified according to dialysate/ plasma (D/P) phosphorus at the 4 hour of PET as slow transporter (< 0.47), slow-average transporter (0.47 - 0.56), fast-average transporter (0.57 - 0.67), and fast transporter (> 0.67). We evaluated the relationship of peritoneal phosphorus clearance and transport type with PD regime, phosphorus level, and presence of residual renal function in addition to investigating factors that are effective on peritoneal phosphorus clearance. Results: D/P phosphorus and peritoneal phosphorus clearance were positively correlated with D/P creatinine and peritoneal creatinine clearance, respectively. Automated PD and continuous ambulatory PD patients were similar regarding phosphorus and creatinine clearances and transport status based on D/P phosphorus. The major determinant of peritoneal phosphorus clearance was anuria status. Anuric patients had higher dialysate volume (11.6 ± 3.0 L vs. 8.4 ± 2.1 L, p < 0.001) and therefore higher peritoneal phosphorus clearance (61.7 ± 15.1 L/week/1.73 m vs. 48.4 ± 14.0 L/week/1.73 m, p = 0.001). Hyperphosphatemia was present in 40% and 11% of anuric patients and those with residual re.

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