Changes in peritoneal dialysis sodium dialysate/plasma ratio over time

Sodium D/P (dialysate/plasma) ratios versus time as measured in 1985 (5/23/85, white curve) and 1992 (7/06/92, black curve) in a patient with progressive loss of ultrafiltration. Values are superimposed upon the standard curves. The initial curve is normal, displaying an initial drop of the ratio; the second curve is abnormal with no decrease at the beginning of dwell. The curve rises steadily after a one hour dwell.