Dialyzer clearance of ampicillin/sulbactam in plasma of critically ill patients with AKI undergoing extended dialysis. Dialyzer clearance of ampicillin/sulbactam in plasma of critically ill patients with AKI undergoing extended dialysis. Predialyzer and postdialyzer blood samples were drawn 15 minutes after start of treatment with no net ultrafiltration. Data are visualized as box and whisker plots. Horizontal bars indicate median values. Johan M. Lorenzen et al. CJASN 2012;7:385-390 ©2012 by American Society of Nephrology