Figure 1From: Clinical review: Patency of the circuit in continuous renal replacement therapyMechanism of contact activation by hemofilter membranes. ADP, adenosine diphosphate; C, complement factor; GP, glycoprotein; HMWK, high molecular weight kininogens; PAF, platelet activating factor released by polymorphonuclear cells; plt., platelets; RBC, red blood cells; TF, tissue factor expressed by adhering monocytes; TXA, thromboxane A2.Back to article page