Un patient de 55 ans presentant une serologie VIH positive et une maladie de Vaquez a beneficie de pontages coronariens sous circulation extracorporelle en normothermie. Sous heparinisation correcte (ACT = 633 secondes), une thrombose d'oxygenateur survenait, precedee par une elevation des pressions sanguines a 350 mmHg en amont de l'oxygenateur et une diminution de la saturation en oxygene dans le sang arteriel et veineux mele au niveau de l'oxygenateur. Un changement rapide d'oxygenateur a permis de poursuivre la circulation extracorporelle et d'eviter d'autres complications. La microscopie electronique a montre des depots de fibrine et de plaquettes sur la membrane et l'echangeur thermique.
A 55-year-old male with a history of positive HIV serology and Polycytemia vera underwent coronary artery bypass graft surgery with normothermic extracorporeal circulation. Following heparin administration the activated clotting time (ACT) was 633 seconds (Hemocron ( R) with kaolin). Lower than expected arterial and venous oxygen partial pressures together with high pressure (350 mmHg) in the arterial line upstream of the oxygenator were observed. Because of these signs the oxygenator was changed during the procedure. The outcome was uneventful. Electronic microscopic examination of the oxygenator membrane and thermic exchanger revealed fibrin and platelet deposits.