Heparin is routinely used for anticoagulation during cardiopulmonary bypass; it is fast acting, is easily monitored, and has an antidote. Heparin-induced thrombocytopenia (HIT) can be a life-threatening condition requiring an alternative anticoagulant (hirudin) if cardiac surgical intervention is considered. At full anticoagulant doses, the effects of hirudin are difficult to monitor; therefore, we present a case in which off-pump coronary artery bypass grafting was performed in an HIT patient in whom the lower doses of hirudin could safely be monitored with easily available tests.
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