Controlled Ultrafiltration During Single‐Pass Dialysis with the RP‐6 Dialyzer and Evaluation of Its Time‐Dependent Ultrafiltration Index

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Abstract
A simple and inexpensive method is described for controlling ultrafiltration when using the high flux RP-6 dialyzer. When the RP-6 is operated in the co-current mode with single-pass dialysate delivery, PBc[valve adjusted hydrostatic pressure of blood]-PDo [valve adjusted hydrostatic pressue of dialysate] can be used to accurately and safely control ultrafiltration. Combined results from 10 dialyses indicate a pressure-dependent concentration polarization which affects ultrafiltration and a time-dependent effect indicating a more complex dialyzer/blood interaction. The ultrafiltration index decreases linearly with time. An equation is proposed for the adequate prediction of ultrafiltration.