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Course: Analysis of Outcomes in Ischemic vs Nonischemic Cardiomyopathy in Patients With Atrial Fibrillation: A Report From the GARFIELD-AF Registry

CME Credits: 1.00

Released: 2019-05-08

Key Points

Question What are the management strategies and outcomes of patients with nonvalvular atrial fibrillation and concomitant congestive heart failure (ischemic or nonischemic cardiomyopathy)?
Findings In this cohort study of a registry that included 52,014 patients, patients with ischemic cardiomyopathy were less likely to receive oral anticoagulants with or without antiplatelet drugs and more likely to receive antiplatelet drugs alone than patients with nonischemic cardiomyopathy and had a worse outcome in terms of all-cause and cardiovascular death.
Meaning There is a need for physicians to opt for improved adherence to guidelines-directed treatment of both atrial fibrillation and concomitant congestive heart failure, particularly in patients with ischemic cardiomyopathy.

Abstract

Importance Congestive heart failure (CHF) is commonly associated with nonvalvular atrial fibrillation (AF), and their combination may affect treatment strategies and outcomes.
Objective To assess the treatment strategies and 1-year clinical outcomes of antithrombotic and CHF therapies for patients with newly diagnosed AF with concomitant CHF stratified by etiology (ischemic cardiomyopathy [ICM] vs nonischemic cardiomyopathy [NICM]).
Design, Setting, and Participants The GARFIELD-AF registry is a prospective, noninterventional registry. A total of 52,014 patients with AF were enrolled between March 2010 and August 2016. A total of 11,738 patients 18 years and older with newly diagnosed AF (-6 weeks’ duration) and at least 1 investigator-determined stroke risk factor were included. Data were analyzed from December 2017 to September 2018.
Exposures One-year follow-up rates of death, stroke/systemic embolism, and major bleeding were assessed.
Main Outcomes and Measures Event rates per 100 person-years were estimated from the Poisson model and Cox hazard ratios (HRs) and 95% confidence intervals.
Results The median age of the population was 71.0 years, 22,987 of 52,013 were women (44.2%) and 31,958 of 52,014 were white (61.4%). Of 11,738 patients with CHF, 4717 (40.2%) had ICM and 7021 (59.8%) had NICM. Prescription of oral anticoagulant and antiplatelet drugs was not balanced between groups. Oral anticoagulants with or without antiplatelet drugs were used in 2753 patients with ICM (60.1%) and 5082 patients with NICM (73.7%). Antiplatelets were prescribed alone in 1576 patients with ICM (34.4%) and 1071 patients with NICM (15.5%). Compared with patients with NICM, use of angiotensin-converting enzyme inhibitors/angiotensin receptor blockers (72.6% [3439] vs 60.3% [4236]) and of ? blockers (63.3% [2988] vs 53.2% [3737]) was higher in patients with ICM. Rates of all-cause and cardiovascular death per 100 patient-years were significantly higher in the ICM group (all-cause death: ICM, 10.2; 95% CI, 9.2-11.1; NICM, 7.0; 95% CI, 6.4-7.6; cardiovascular death: ICM, 5.1; 95% CI, 4.5-5.9; NICM, 2.9; 95% CI, 2.5-3.4). Stroke/systemic embolism rates tended to be higher in ICM groups compared with NICM groups (ICM, 2.0; 95% CI, 1.6-2.5; NICM, 1.5; 95% CI, 1.3-1.9). Major bleeding rates were significantly higher in the ICM group (1.1; 95% CI, 0.8-1.4) compared with the NICM group (0.7; 95% CI, 0.5-0.9).
Conclusions and Relevance Patients with ICM received oral anticoagulants with or without antiplatelet drugs less frequently and antiplatelets alone more frequently than patients with NICM, but they received angiotensin-converting enzyme inhibitors/angiotensin receptor blockers more often than patients with NICM. All-cause and cardiovascular death rates were higher in patients with ICM than patients with NICM.
Trial Registration ClinicalTrials.gov Identifier:


Educational Objective
To understand which management strategies improve outcomes of those with cardiomyopathy and atrial fibrillation.


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