The Journal of arthroplasty
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Warfarin provides effective prophylaxis against postoperative venous thromboembolic complications in adults undergoing elective hip surgery, but at the risk of increased bleeding complications. Although patients on this drug are routinely monitored by prothrombin time (PT), mild elevations of the partial thromboplastin time (PTT) have been reported with warfarin therapy. In a prospective study of 194 patients undergoing elective hip surgery, the authors assessed the incidence of elevation of the PTT above 50 seconds while the patient was receiving warfarin prophylaxis and the effect of this elevation on bleeding complications. ⋯ Major postoperative bleeding complications occurred in 26.3% of group 1 patients, versus 4.5% of group 2 (P less than .01). This subset of patients with an abnormal PTT elevation despite appropriate control of the PT is at a significantly increased risk of major postoperative bleeding. This observation may also prove valuable in reducing bleeding complications from warfarin use in nonsurgical patients.