Peritoneal Fluid Transport rather than Peritoneal Solute Transport Associates with Dialysis Vintage and Age of Peritoneal Dialysis Patients

Table 1

Peritoneal transport characteristics (mean ± SD) from miniPET (after 1 h dwell) and PET (after 4 h dwell) and their correlations (expressed as Spearman correlation coefficient rho) with creatinine D/P, patient age, and dialysis vintage, for 33 prevalent peritoneal dialysis patients.

Parameters	Parameter value	Correlation with; creatinine D/P	Correlation with age	Correlation with; dialysis vintage
miniPET
Net ultrafiltration [mL]	375 ± 107	NS	−0.62	NS
Ultrafiltration through small pores [mL]	168 ± 107	NS	−0.36	−0.37
Free water transport [mL]	207 ± 62	NS	−0.41	NS
Free water fraction [%]	58 ± 20	NS	NS	0.37
D/P sodium	0.85 ± 0.03	0.57	0.38	NS
Dip D/P sodium	0.077 ± 0.028	NS	NS	NS
Albumin clearance	0.127 ± 0.049	0.68	NS	NS
PET
Net ultrafiltration [mL]	168 ± 168	−0.47	−0.53	NS
D/P creatinine	0.66 ± 0.10	1.00	NS	NS
D/D0 glucose	0.36 ± 0.07	−0.85	NS	NS
Albumin clearance	0.099 ± 0.038	0.78	NS	NS
IgM clearance	0.020 ± 0.013	0.58	NS	NS

Net ultrafiltration (netUF60) was defined as the difference between the weight of the effluent (Vend) and the weight of the infused peritoneal dialysis fluid (V0); ultrafiltration through small pores UFSP60 = RemNa/CBNa, where sodium removal RemNa = Vend CNaEnd − V0 CNa0; free water transport FWT = netUF60 − UFSP60; free water fraction FWF = FWT/netUF60.
D/P sodium, dialysate to plasma sodium concentration (D/PNa) at the end (D/PNa60) of miniPET; dip D/P sodium, sodium dip DipNa60 = D/PNa0 − D/PNa60; NS, not significant.