PPC and UPC at various time-points during HP therapy. Prior to HP therapy (0 h): PPC, 3.50±2.493 mg/l; UPC, 6.66±5.25 mg/l (n=19)-; 3 h after HP therapy: PPC, 1.65±1.477 mg/l; UPC, 2.94±2.085 mg/l (n=17); 6 h after HP therapy: PPC, 1.48±1.228 mg/l; UPC, 1.98±2.362 mg/l (n=10); 9 h after HP therapy: PPC, 0.50 mg/l; UPC, 0.80 mg/l (n=3); 12 h after HP therapy: PPC, 0.40 mg/l; UPC, 0.60 mg/l (n=1); 15 h after HP therapy: PPC, 0.15 mg/l; UPC, 0.1 mg/l (n=1). *P<0.05 as indicated. UPC, urine paraquat concentration; PPC, plasma paraquat concentration; HP, charcoal hemoperfusion.