• S Schulman, J S Healey, J D Douketis, J Delaney, and C A Morillo.
• Thrombosis and Atherosclerosis Research Institute, McMaster University, Hamilton, ON, Canada; Department of Medicine, Thrombosis Service, McMaster University, Hamilton, ON, Canada; Karolinska Institutet, Stockholm, Sweden. Electronic address: schulms@mcmaster.ca.
• Thromb. Res. 2014 Oct 1;134(4):814-8.

BackgroundPerioperative management with reduced-dose warfarin is of potential interest by eliminating the need for bridging while still maintaining a degree of anticoagulation. The outcomes of this regimen have not been well determined.MethodsIn a randomized controlled trial we compared two regimens for management of anticoagulation with warfarin in patients with implantation of a pacemaker or defibrillator. Half dose of warfarin for 3-6 days, depending on the baseline international normalized ratio (INR), before surgery aiming at an INR of ≤ 1.7 was compared with interrupted warfarin for 5 days with preoperative bridging with low-molecular-weight heparin (LMWH) at therapeutic dose for 2.5 days. Main safety outcome was pocket hematoma. Secondary outcomes were major bleeding, thromboembolism - all within 1 month, days of hospitalization and number of patients requiring correction of INR with vitamin K.ResultsThe study was planned for 450 patients but it was discontinued prematurely due to a change in practice. Pocket hematoma occurred in 4 of 85 patients (5%) randomized to the bridged regimen and in 3 of 86 patients (3%) randomized to reduced-dose warfarin. One pocket hematoma in each group was severe. There were no major hemorrhages or thromboembolism within the 1-month window. Duration of hospitalization was similar in the two groups. Correction of INR the day before surgery with vitamin K had to be used for significantly more patients in the reduced-dose warfarin group (41%) than in the bridged regimen group (6%).ConclusionThe reduced-dose warfarin regimen appeared to have similar safety after device implantation as interrupted warfarin with preoperative LMWH bridging. Due to premature discontinuation no firm conclusion can be drawn. The reduced-dose warfarin regimen often failed to achieve the intended preoperative INR. ClinicalTrials.gov Identifier: NCT 02094157.Copyright © 2014 Elsevier Ltd. All rights reserved.

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