Fig. 2From: Emergency cardiac surgery and heparin resistance in a patient with essential thrombocythemiaChanges in ACT and AT III. More heparin than expected was needed to carry out extracorporeal circulation. The patient’s AT III levels decreased during surgery, and administration of AT III was needed. Less protamine than expected was needed to neutralize the heparin effect. ACT activated coagulation time, AT III antithrombin III, CPB cardiopulmonary bypassBack to article page