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Online ISSN 1827-1596
Ranucci M. 1, Romitti F. 1, Costa E. 2
1 Department of Cardiothoracic-Vascular Anesthesia and Intensive Care, Polyclinic Hospital S. Donato IRCCS, Milan, Italy;
2 Clinical Laboratory, Polyclinic Hospital S. Donato IRCCS, Milan, Italy
Hyperhomocysteinemia is a pathological condition that increases cardiovascular risk due to prothrombotic behaviour in the patient. This case report concerns a 61-year-old man undergoing surgical coronary revascularization for early thrombosis of the venous graft. The postoperative antithrombin activity was extremely low (33%), despite normal preoperative values (79%) and a short cardiopulmonary bypass. At a subsequent screening, the patient was diagnosed with hyperhomocysteinemia (18.4 µmol/L) due to a heterozygous C677T mutation of the enzyme methylenetetrahydrofolate reductase associated with a folate deficiency. Hyperhomocysteinemia and cardiac operation are both factors that induce increased thrombin formation, which may induce antithrombin consumption and a consequent thrombotic event. Further studies are needed to define hyperhomocysteinemia as an independent risk factor for thrombotic events after cardiac surgery.