Nephrol Dial Transplant (2000) 15: 1189-1193
© 2000 European Renal Association-European Dialysis and Transplant Association
Extended daily veno-venous high-flux haemodialysis in patients with acute renal failure and multiple organ dysfunction syndrome using a single path batch dialysis system
1 Medizinische Hochschule Hannover, Abteilung Nephrologie, 2 Klinik für Nieren-, Hochdruck-und Gefäßkrankheiten, Klinikum Hannover Oststadt, 3 Medizinische Klinik II, RWTH Aachen, and 4 Gemeinschaftspraxis für Nephrologie/Dialyse, Langenhagen, Germany
Background. In the treatment of acute renal failure in patients with multiple organ dysfunction syndrome (MODS), continuous renal replacement therapies (CRRT) are increasingly used because of excellent volume control in the presence of improved cardiovascular stability. Patients with MODS, however, are frequently catabolic and have a high urea generation rate requiring either cost-intensive high-volume CRRT or additional intermittent haemodialysis to provide adequate clearance of small-molecular waste products. We tested the closed-loop batch haemodialysis system (called Genius®) for the treatment of acute renal failure in patients with MODS in the intensive care unit.
Methods. Blood flow and countercurrent dialysate flow were reduced to 70 ml/min. Thus the 75 l dialysate tank of the Genius® system lasts for 18 h of extended single-path high-flux haemodialysis (18 h-HFD) using polysulphous F60 S® dialysers. Blood pressure, body temperature, and venous blood temperature in the extracorporeal circuit (no heating of the dialysate), ultrafiltration rate, serum urea levels, dialyser urea clearance, and total urea removal were monitored. In addition we tested the bacteriological quality of the spent dialysate at the end of 18-h treatments.
Results. Twenty patients with acute renal failure and MODS were investigated. Averaged dialyser urea clearance was 59.8 ml/min (equal to 3.6 l/h or 64.8 l/day). Total removal of urea was 14.1±6.5 g/day keeping serum levels of urea below 13 mmol/l. Mean arterial pressure remained stable during the 18-h treatments with a mean ultrafiltration rate of 120 ml/h. The temperature in the venous blood tubing dropped by 5±0.5°C during the 18-h treatment (0.28°C/h) in the presence of unchanged core temperature in the patients. There was no bacterial growth in 2.5 l of spent dialysate (<0.0004 colony forming units/ml).
Conclusions. Extended high-flux dialysis using the Genius® system combines the benefits of CRRT (good cardiovascular stability, sterile dialysate) with the advantages of intermittent dialysis (high urea clearance, low treatment costs). High efficiency, simplicity and flexibility of the system offers the unique opportunity to use the same dialysis machine for extended time periods (18 h) as well as for shorter intermittent renal replacement therapy in critically ill patients.
Keywords: acute renal failure; cardiovascular stability; dialysate temperature; extended daily high-flux haemodialysis; multiple organ dysfunction syndrome; sterile dialysate
Correspondence and offprint requests to: PD Dr med. Gerhard Lonnemann, Gemeinschaftspraxis für Nephrologie/Dialyse, Eickenhof 15, D-30851 Langenhagen, Germany.
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