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Medline ® Abstracts for References 62,63

of 'Perioperative management of patients receiving anticoagulants'

62
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Conservative perioperative anticoagulation management in patients with chronic venous thromboembolic disease: a cohort study.
AU
Skeith L, Taylor J, Lazo-Langner A, Kovacs MJ
SO
J Thromb Haemost. 2012;10(11):2298.
 
Summary. Background: Guidelines for perioperative warfarin management in patients with venous thromboembolic disease (VTE) are largely based on expert opinion. Objectives: To assess the effectiveness and safety of a conservative perioperative anticoagulation strategy in patients with VTE on chronic warfarin therapy. Our center uses a conservative bridging approach for chronic VTE patients consisting of withholding warfarin for 5 days preoperatively, with prophylactic low-molecular-weight heparin (LMWH) post-procedure only if patients are admitted to hospital. Patients/Methods: We performed a single-center retrospective cohort study. During the study period (1997-2011) there were 634 procedures in 416 patients that were reviewed for postoperative outcomes at 30 and 90 days. Results: Of the 634 procedures, 156 procedures (24.6%) were completed as inpatients. Pre- and post-procedure LMWH bridging was used in 15 (2.4%) and 152 (24.0%) of all procedures, respectively. The 30-day VTE incidence was 0.32% (95% confidence interval [CI]0.087-1.14), all non-fatal DVTs. The 30-day incidence of major and total bleeding events was 1.26% (95% CI 0.64-2.47) and 3.00% (95% CI 1.93-4.63), respectively. The all-cause mortality rate was 0.32% (95% CI 0.087-1.14) at 30 days; two patients died from arterial thrombosis events. Conclusions: A randomized controlled trial is needed to provide definitive conclusions but a conservative bridging approach appears promising.
AD
Department of Medicine, Division of Hematology, London Health Sciences Centre, London, ON Department of Epidemiology and Biostatistics, University of Western Ontario, London, ON, Canada.
PMID
63
TI
Bleeding, Recurrent Venous Thromboembolism, and Mortality Risks During Warfarin Interruption for Invasive Procedures.
AU
Clark NP, Witt DM, Davies LE, Saito EM, McCool KH, Douketis JD, Metz KR, Delate T
SO
JAMA Intern Med. 2015 Jul;175(7):1163-8.
 
IMPORTANCE: The risk of bleeding and recurrent venous thromboembolism (VTE) among patients receiving long-term warfarin sodium therapy for secondary VTE prevention who require temporary interruption of anticoagulant therapy for surgery or invasive diagnostic procedures has not been adequately described.
OBJECTIVE: To describe the rates of clinically relevant bleeding and recurrent VTE among patients in whom warfarin therapy is interrupted for invasive procedures and compare these rates among patients who did and did not receive bridge therapy.
DESIGN, SETTING, AND PARTICIPANTS: A retrospective cohort study was conducted at Kaiser Permanente Colorado, an integrated health care delivery system. Patients in whom warfarin therapy was interrupted for invasive diagnostic or surgical procedures between January 1, 2006, and March 31, 2012, were identified via queries of administrative data sets. A total of 1812 procedures in 1178 patients met inclusion criteria. Data on outcomes and exposures were collected between June 1, 2005, and April 30, 2012.
EXPOSURES: Use of bridge therapy vs no bridge therapy during warfarin interruption.
MAIN OUTCOMES AND MEASURES: Thirty-day clinically relevant bleeding, recurrent VTE, and all-cause mortality. Outcomes were verified via manual review of medical records.
RESULTS: Among the 1178 patients, the mean (SD) age was 66.1 (12.7) years, 830 procedures (45.8%) were in men, and the most common indication for warfarin therapy was deep vein thrombosis (56.3%). Most patients were considered to be at low risk for VTE recurrence at the time of warfarin interruption (1431 procedures [79.0%]) according to the consensus guidelines of the American College of Chest Physicians. Clinically relevant bleeding within 30 days after the procedure in the bridge therapy and non-bridge therapy groups occurred in 15 patients (2.7%) and 2 patients (0.2%), respectively (hazard ratio, 17.2; 95% CI, 3.9-75.1). There was no significant difference in the rate of recurrent VTE between the bridge and non-bridge therapy groups (0 vs 3; P = .56). No deaths occurred in either group.
CONCLUSIONS AND RELEVANCE: Bridge therapy was associated with an increased risk of bleeding during warfarin therapy interruption for invasive procedures in patients receiving treatment for a history of VTE and is likely unnecessary for most of these patients. Further research is needed to identify patient- and procedure-related characteristics associated with a high risk of perioperative VTE recurrence during warfarin therapy interruption.
AD
Department of Pharmacy, Kaiser Permanente Colorado, Aurora2Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora.
PMID