Abstract
Clearance of solutes by artificial kidneys can be calculated using plasma flow and solute concentration, whole blood flow and plasma solute concentration, and midpoint of dialysis blood or plasma solute concentration and total amount of solute removed. Using these methods, the clearance of procainamide (PA) and N-acetylprocainamide (NAPA) was determined in 4 patients. In all but one case clearances using total amount recovered were greater than clearances using whole blood flow and plasma concentration. Without exception, clearance determined using amount recovered was substantially greater than clearance using plasma flow and plasma levels, suggesting that both PA and NAPA are removed not only from plasma but also from red blood cells. In vitro clearance of PA, NAPA, quinidine, and phenobarbital by 11 clinically available artificial kidneys and an XAD-4 hemoperfusion column was determined and differences were found.
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