Clearance of iopromide during haemodialysis with high- and low-flux membranes

Purpose. The present clinical trial addressed the clearance of the contrast medium iopromide, a middle-sized molecule, during dialysis with high- and low-flux membranes. Material and Methods. Twenty chronic haemodialysis patients without residual renal function were dialysed either with low-flux haemophan or high-flux polyamide directly after application of the contrast medium. Iodine concentrations were determined by radiofluorescence methods. Results. Plasma concentrations of iodine before dialysis ranged between 1.1 and 3.9 mg/ml. The mean clearance rates for both membranes were comparable (110+/-1.4 ml/min high-flux and 108+/-1.9 ml/min low-flux), the sieving-coefficient was 0.83 for both membranes. After three hours of dialysis, 58% (high-flux) and 62% (low-flux) of iopromide was removed, half time of elimination was reached after 140+/-16 min (high-flux) and 122+/-11 min (low-flux). Conclusion: Our results demonstrated that elimination of iopromide is not dependent on the pore size of the membrane during dialysis. Due to higher blood how rate, we found a higher elimination rate and a reduced half-time of elimination than prior investigations.