• V Muedra, S Bonanad, M Gómez, V Villalonga, F Sánchez, and J E Llopis.
• Department of Anesthesia, Critical Care and Pain Therapy, La Ribera University Hospital, Alzira, Valencia, Spain. vmuedra@hospital-ribera.com
• Perfusion. 2011 Nov 1; 26 (6): 487-95.

IntroductionA study on 149 cardiopulmonary bypass (CPB) patients was performed to elucidate possible relationships between antithrombin (AT) activity and a subject's clinical profile or surgery characteristics.MethodsAn initial dose (300 IU/kg) of heparin was administered before CPB. Additional boluses (100 IU/kg) were administered if the activated clotting time (ACT)≤460 s. AT activity and hematological parameters were determined preoperatively, during and after CPB, and at 12, 24, 36, and 48 hours post-intervention.Results29.5% patients required an additional dose of heparin during CPB. Preoperative AT was 96.5 ± 13.9% in all but 4 patients. AT was significantly lower during CPB and upon leaving the operating room (59.7%-80.0%). A small, but significant, inverse correlation was observed between AT at the end of CPB and the patient's age, as well as between basal preoperative AT and total heparin administered.ConclusionsPatient's age could be a moderate indicator of AT activity drop and low preoperative AT activity could be a sign of reduced anticoagulant efficacy of heparin during CPB.

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