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Home All Specialties Cardiology

Warfarin beneficial in chronic kidney patients with atrial fibrillation

byRavi Shah
March 6, 2014
in Cardiology, Chronic Disease, Nephrology
Reading Time: 3 mins read
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1. Warfarin therapy in chronic kidney disease patients with atrial fibrillation decreased incidence of death, myocardial infarction and stroke at 1-year follow-up.

2. The severity of kidney disease did not correlate to the rate of these outcomes.

Evidence Rating Level: 1 (Excellent)      

Study Rundown: Patients presenting with atrial fibrillation (AF) following myocardial infarction are often prescribed warfarin as a preventative measure against thromboembolic events. A subset of these patients also have chronic kidney disease (CKD) potentially complicating their AF management. While patients with CKD and AF have increased risk of thromboembolic events, studies have yielded ambiguous results regarding complications with warfarin use. This study, conducted with Swedish patient data, provides evidence that warfarin therapy decreases 1-year risk of death, myocardial infarction, or ischemic stroke in AF patients at all stages of CKD. There was also no significant difference found in hemorrhagic events between the warfarin and non-warfarin populations. Of note, poor outcome rates were not associated with severity of CKD.

The study’s strengths lie in the large study population, relative completeness of patient information, and thorough control of confounders. Additionally patients in Scandinavian countries have demonstrated therapeutic INRs about 75% of their time on warfarin. Duration of AF, valvular replacement, pulmonary embolism, and deep venous thromboembolism, potentially confounding factors, were not controlled for in this analysis. Furthermore, the follow-up was limited to 1 year, which may be too short to detect complications. Nonetheless, this study supports warfarin use in patients with AF and CKD.

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Click to read the study in JAMA

Click to read an accompanying editorial in JAMA

Relevant reading: Anticoagulant and antiplatelet therapy in patients with chronic kidney disease: risks versus benefits review.

In-Depth [prospective, observational study]: This study analyzed the occurrence of complications in AF following cardiac events in patients with concomitant CKD. Patient information was collected from the National Inpatient Registry and the System for Enhancement and Development of Evidence Based Care in Heart Disease Evaluated According to Recommended Therapies (SWEDEHEART) registry in Sweden. A total of 24,317 patients were included in the study of which 5,292 were prescribed warfarin for AF treatment. CKD was stratified into four classes. Rates of death, myocardial infarction and stroke were significantly less at all stages of CKD; eGFR≥60 HR 0.73 (CI95%, 0.65-0.81), eGFR30-60 HR 0.73 (CI95%, 0.66-0.80), eGFR15-30 HR 0.84 (CI95%, 0.70-1.02), eGFR<15 HR 0.57 (CI95%, 0.37-0.86%) in the warfarin cohort. There were no significant differences among hemorrhagic outcome.

More from this author: Radiofrequency catheter ablation effective as first-line therapy for atrial fibrillation [RAAFT-2 trial], Vitamin E associated with slower functional decline in Alzheimer disease [TEAM-AD Trial], PET scans accurately identify amyloid deposition following traumatic brain injury, Bystander CPR positively associated with cardiac arrest survival, Terminal cancer patients hold misconceptions of the role of chemotherapy

©2012-2014 2minutemedicine.com. All rights reserved. No works may be reproduced without expressed written consent from 2minutemedicine.com. Disclaimer: We present factual information directly from peer reviewed medical journals. No post should be construed as medical advice and is not intended as such by the authors, editors, staff or by 2minutemedicine.com. PLEASE SEE A HEALTHCARE PROVIDER IN YOUR AREA IF YOU SEEK MEDICAL ADVICE OF ANY SORT. 

Tags: atrial fibrillationwarfarin
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