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Sustained atrial fibrillation increases the risk of anticoagulation-related bleeding in heart failure

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Abstract

Background

Oral anticoagulation therapy in individuals with atrial fibrillation (AF) reduces the risk of thromboembolic events at cost of an increased bleeding risk. Whether anticoagulation-related outcomes differ between patients with paroxysmal and sustained AF receiving anticoagulation is controversially discussed.

Methods

In the present analysis of the prospective multi-center cohort study thrombEVAL, the incidence of anticoagulation-related adverse events was analyzed according to the AF phenotype. Information on outcome was centrally recorded over 3 years, validated via medical records and adjudicated by an independent review panel. Study monitoring was provided by an independent institution.

Results

Overall, the sample comprised 1089 AF individuals, of whom n = 398 had paroxysmal AF and n = 691 experienced sustained AF. In Cox regression analysis with adjustment for potential confounders, sustained AF indicated an independently elevated risk of clinically relevant bleeding compared to paroxysmal AF [hazard ratio (HR) 1.40 (1.02; 1.93); P = 0.038]. For clinically relevant bleeding, a significant interaction of the pattern of AF type with concomitant heart failure (HF) was detected: HRHF 2.45 (1.51, 3.98) vs. HRno HF 0.85 (0.55, 1.34); Pinteraction = 0.003. In HF patients, sustained AF indicated also an elevated risk of major bleeding [HR 2.25 (1.26, 4.20); P = 0.006]. A simplified HAS-BLED score incorporating only information on age (> 65 years), bleeding history, and HF with sustained AF demonstrated better discriminative performance for clinically relevant bleeding than the original version: AUCHAS-BLED: 0.583 vs. AUCsimplifiedHAS-BLED: 0.642 (P = 0.004).

Conclusions

In HF patients receiving oral anticoagulation, sustained AF indicates a substantially elevated risk of bleeding.

Clinical Trial Registration

https://clinicaltrials.gov, identifier: NCT01809015.

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Abbreviations

AF:

Atrial fibrillation

AUC:

Area under the curve

CI:

Confidence interval

CVRF:

Cardiovascular risk factor

HR:

Hazard ratio

IQR:

Interquartile range

TTR:

Time in therapeutic range

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Acknowledgements

We are indebted to all study participants of the thrombEVAL study and all co-workers of the Center for Thrombosis and Hemostasis of the University Medical Mainz. This work contains results that are a part of the doctoral thesis of Torben Knöpfler.

Funding

The thrombEVAL study was supported by the state initiative “health economy” of the Ministries of Health and Economics, Rhineland-Palatinate, Germany (Grant identifier: AZ.623-1), the Federal Ministry of Education and Research, Germany (Grant identifier: BMBF 10E01003), the Centre for Translational Vascular Biology (CTVB) of the University Medical Center Mainz, Boehringer Ingelheim Pharma GmbH & Co. KG, Bayer Vital GmbH, Daiichi Sankyo Europe GmbH, Sanofi-Aventis Germany GmbH, IMO Institute GmbH, Portavita BV and the German Heart Foundation. The sponsoring bodies played no role in the planning, conduct or analysis of this study.

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Correspondence to Jürgen H. Prochaska or Philipp S. Wild.

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Prochaska, J.H., Göbel, S., Nagler, M. et al. Sustained atrial fibrillation increases the risk of anticoagulation-related bleeding in heart failure. Clin Res Cardiol 107, 1170–1179 (2018). https://doi.org/10.1007/s00392-018-1293-4

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