Abstract
Purpose
Although direct oral anticoagulants are effective and safe in preventing stroke in atrial fibrillation (AF) patients with low body weight, data remain limited in AF patients with extremely low body weight (<50 kg). We aimed to investigate the association of this body weight category with clinical outcomes in elderly AF patients receiving apixaban.
Methods
The J-ELD AF Registry is a large-scale, multicenter prospective observational study of Japanese non-valvular AF patients aged ≥ 75 years taking on-label doses of apixaban. The entire cohort (3025 patients from 110 institutions) was divided into three body weight subgroups: >60 kg (n = 1019, 33.7%), 50–60 kg (n = 1126, 37.2%), and <50 kg (n = 880, 29.1%).
Results
The event incidence rates (/100 person years) were 1.69, 1.82, and 1.23 for stroke or systemic embolism (P = 0.60); 1.37, 1.73, and 2.73 for bleeding requiring hospitalization (P = 0.154); 2.02, 2.67, and 4.92 for total death (P = 0.003); and 0.73, 0.95, and 1.23 for cardiovascular death (P = 0.57), respectively. After adjusting for confounders by Cox regression analysis, body weight <50 kg was not an independent risk for stroke or systemic embolism, bleeding requiring hospitalization, total death, or cardiovascular death.
Conclusions
The incidence of events in each body weight group was comparable for stroke or systemic embolism and bleeding requiring hospitalization, and body weight <50 kg might not be an independent risk for death in Japanese non-valvular AF patients aged ≥ 75 years taking on-label doses of apixaban.
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Availability of Data and Material
The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.
Code Availability
Statistical analysis was performed using SAS Ver. 9.4 (SAS Institute Inc., Cray, NC).
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Acknowledgements
We would like to thank the J-ELD AF investigators for their support in patient registration and data collection. This study was conducted by the Cardiovascular Institute Academic Organization (CVI ARO), Tokyo, Japan, subsidized and funded by pharmaceutical and medical device companies.
Funding
Bristol-Myers Squibb K. K. provided monetary support for this study. This study was partially supported by the Practical Research Project for Life-Style related Diseases including Cardiovascular Diseases and Diabetes Mellitus from Japan Agency for Medical Research and Development (AMED) (15656344 and JP17ek0210082). However, there was no conflict of interest between the study center and sponsor concerning the conduct of the study or study outcomes.
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Contributions
Contributions by each author according to the Contributor Roles Taxonomy (CRediT; https://www.casrai.org/credit.html) are as follows:
Takahide Kadosaka: conceptualization, methodology, formal analysis, and writing—original draft
Toshiyuki Nagai: conceptualization, methodology, formal analysis, and writing—original draft
Shinya Suzuki: data curation, formal analysis, investigation, and writing—review and editing
Ichiro Sakuma: investigation and writing—review and editing
Masaharu Akao: investigation, project administration, and writing—review and editing
Takeshi Yamashita: funding acquisition, investigation, project administration, supervision, and writing—review and editing
Toshihisa Anzai: conceptualization, methodology, formal analysis, and writing—review and editing
Ken Okumura: funding acquisition, investigation, project administration, supervision, and writing—review and editing
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Ethics Approval
This study was performed in conformity to the ethical norms based on the Declaration of Helsinki (revised in 2008) and Ethical Guidelines for Medical and Health Research Involving Human Subjects (Public Notice of the Ministry of Education, Culture, Sports, Science and Technology, and the Ministry of Health, Labor and Welfare in Japan, issued in 2014).
Consent to Participate
Prior to enrolment, the contents of the study were explained to the patients using explanatory documents and consent documents, and written consent was obtained. If a patient withdrew consent during the observation period, all existing data collected from the patient were discarded.
Conflict of Interest
Dr. Kadosaka reports no conflict. Dr. Nagai received honoraria from Daiichi Sankyo Co., Ltd., a clinical research grant from JSPS KAKENHI Grant-in-Aid for Scientific Research, and research grants from the Takeda Science Foundation, the Japan Foundation for Aging and Health, and the Uehara Memorial Foundation. Dr. Suzuki received research funding from Daiichi-Sankyo and Mitsubishi-Tanabe. Dr. Sakuma reports no conflict. Dr. Akao received lecture fees from Pfizer, Bristol-Myers Squibb, Boehringer Ingelheim, Bayer Healthcare, and Daiichi-Sankyo. Dr. Yamashita received lecture fees from Bristol Myers Squibb, Daiichi-Sankyo, Bayer, Pfizer, Ono Pharmaceutical, and Toa Eiyo and research funding from Bayer and Daiichi Sankyo. Dr. Anzai received honoraria from Daiichi Sankyo Co., Ltd., Ono Pharmaceutical Co., Ltd., Boehringer Ingelheim Japan Co., Ltd., Bayer Pharmaceuticals Co., Ltd., and Bristol-Myers Squibb Co., Ltd.; clinical research grants from the Japan Agency for Medical Research and Development and Daiichi Sankyo Co., Ltd.; and scholarship funds from Biotronik Japan Co., Ltd., Medtronic Japan Co., Ltd., Win International Co., Ltd., Medical System Network Co., Ltd., and Hokuyaku Takeyama Holdings, Inc. Dr. Okumura received lecture fees from Daiichi-Sankyo, Boehringer Ingelheim, Bristol-Myers Squibb, Medtronic, and Johnson & Johnson.
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Supplementary Information
Supplement Fig. 1
Efficacy and safety outcomes stratified by body weight and apixaban dose. BW, body weight; CI, confidence interval. (PPTX 3085 kb)
Supplement Table S1
(DOCX 24 kb)
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Kadosaka, T., Nagai, T., Suzuki, S. et al. Association of Low Body Weight with Clinical Outcomes in Elderly Atrial Fibrillation Patients Receiving Apixaban—J-ELD AF Registry Subanalysis. Cardiovasc Drugs Ther 36, 691–703 (2022). https://doi.org/10.1007/s10557-021-07180-4
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DOI: https://doi.org/10.1007/s10557-021-07180-4