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RED-CELL SURVIVAL IN PATIENTS ON CONTINUOUS AMBULATORY PERITONEAL DIALYSIS

From the University Hospital, Renal Division, De Pintelaan, 185, B.9000 Ghent, Belgium and ^* Laboratory for Isotopes and Radiotherapy, University Hospital, De Pintelaan, 185, B.9000 Ghent, Belgium.

An early rise in hematocrit due to an increase in red cell mass (RCM) and a decrease in plasma volume (PV) has been noted after six months of continuous ambulatory peritoneal dialysis (CAPD). The present study measured red-cell survival (RCS) together with RCM and PV at the beginning and after six months of CAPD in paired observations in 15 patients.

RCM increased from 890 &plusmn; 98 to 1089 &plusmn; 142 ml (p < 0.05) and plasma volume decreased from 3026 &plusmn; 295 to 2936 &plusmn; 178 ml. Mean red-cellsurvival half life at the start was 22.3 &plusmn; 1.06 days and rose to 25.2 &plusmn; 1.15 days after six months (p < 0.05). The same results were observed in four diabetic patients on a non-glucose, glycerol-containing dialysate.

This study demonstrates that, after six months of CAPD, not only do hematocrit and red cell mass improve but also the red-cell survival is prolonged. However, a correlation could not be demonstrated between the increase in red-cell mass and prolongation of red-cell survival.

KEY WORDS: Anemia in CAPD; Red cell surv'ival; Red cell mass; Plasma volume.

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