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Failure to achieve target values for both urea (Kt/V) and creatinine clearance has been associated with increased morbidity and mortality in continuous ambulatory peritoneal dialysis patients. The conventional continuous ambulatory peritoneal dialysis regimen, which uses four 2-L exchanges per day, has resulted in up to 40% of such patients failing to achieve proposed targets for weekly Kt/V of 1.7 and weekly creatinine clearance (WCC) of 50 L. In a prospective study, the impact of increasing prescribed volumes by 0.5 L per exchange was evaluated on attaining urea and creatinine clearance targets over a 1-yr period. At 1 yr, 17 patients remaining on the increased dialysis prescription were compared with 18 patients remaining on an unchanged regimen. The mean increase in daily prescribed volume was 1.5 L (22%). This resulted in a significant increase in both peritoneal dialysis Kt/V (1.59 to 1.78 L = 12%) and peritoneal dialysis WCC (45.8 to 50.1 L = 10%) by 1 yr. Because of loss of renal function, there was no significant increase in total clearance at 1 yr, but this loss of renal clearance was offset by the gain in peritoneal clearance. Residual renal function fell at a similar rate in both the increased dialysis and control groups. In the latter, although peritoneal clearance remained stable over the 1-yr period, loss of renal function resulted in reductions in both total Kt/V and WCC. In conclusion, exchange volume can be increased to compensate for loss of renal function over a 1-yr period. Progressive loss of renal clearance resulted in only a modest gain in total solute clearance. It was the larger patients who tolerated the increase in exchange volumes. However, such patients (by virtue of their size) tended not to achieve target values for solute clearance, and the modest gain in peritoneal clearance was insufficient to increase the number of patients in this group achieving such targets for dialysis adequacy.

Impact of increasing dialysis volume on adequacy targets