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Impact of Non-vitamin K Antagonist Oral Anticoagulant Withdrawal on Stroke Outcomes

 Joong Hyun Park  ;  Sang Won Han  ;  Kyung-Yul Lee  ;  Hye-Yeon Choi  ;  Kyeongyeol Cheon  ;  Han-Jin Cho  ;  Yo Han Jung  ;  Hyung Jong Park  ;  Hyo Suk Nam  ;  Ji Hoe Heo  ;  Hye Sun Lee  ;  Gustavo Saposnik  ;  Young Dae Kim 
 Frontiers in Neurology, Vol.9 : 1095, 2018 
Journal Title
 Frontiers in Neurology 
Issue Date
anticoagulation ; cardiac embolism ; non-valvular atrial fibrillation ; outcome ; stroke
Introduction: Discontinuation of oral anticoagulants such as non-vitamin K antagonist oral anticoagulants (NOACs) may induce a hypercoagulable state, leading to severe stroke and poor outcomes. This study aimed to compare stroke outcomes between NOACs withdrawal and other prior medication statuses in patients with non-valvular atrial fibrillation (NVAF). Methods: Consecutive patients who had pre-existing NVAF and were admitted for an acute ischemic stroke or transient ischemic attack- at five hospitals between January 2013 and December 2016 were included. Prior medication status was categorized into seven groups such as no antithrombotics, antiplatelet-only, warfarin with subtherapeutic intensity, warfarin with therapeutic intensity, NOAC, warfarin withdrawal, and NOAC withdrawal. We compared initial National Institute of Health Stroke Scale (NIHSS) scores between groups Results: Among 719 patients with NVAF, The median NIHSS score at admission was 5 (IQR 1-13). The NOAC withdrawal group had the highest median NIHSS scores at stroke onset [16, interquartile range, IQR (1-17)], followed by the warfarin withdrawal group [11, IQR (1-14, 18)], the no antithrombotic group [5, IQR (1-13, 18, 19)], and the warfarin with subtherapeutic intensity group [5, IQR (1-10, 18, 19)]. A Multivariable analysis demonstrated that NOAC withdrawal was independently associated with higher NIHSS scores at stroke onset (B 4.645, 95% confidence interval 0.384-8.906, P = 0.033). The median interval from drug withdrawal to ischemic stroke or TIA was 7 days (IQR 4-15) in the NOAC group. Conclusions: Stroke that occurred after stopping oral anticoagulants, especially NOAC, and was more severe at presentation and associated with poorer outcomes.
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1. College of Medicine (의과대학) > Dept. of Neurology (신경과학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Dept. of Radiology (영상의학교실) > 1. Journal Papers
1. College of Medicine (의과대학) > Yonsei Biomedical Research Center (연세의생명연구원) > 1. Journal Papers
Yonsei Authors
김영대(Kim, Young Dae) ORCID logo https://orcid.org/0000-0001-5750-2616
남효석(Nam, Hyo Suk) ORCID logo https://orcid.org/0000-0002-4415-3995
박형종(Park, Hyungjong)
이경열(Lee, Kyung Yul) ORCID logo https://orcid.org/0000-0001-5585-7739
이혜선(Lee, Hye Sun) ORCID logo https://orcid.org/0000-0001-6328-6948
허지회(Heo, Ji Hoe) ORCID logo https://orcid.org/0000-0001-9898-3321
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