Data availability
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.
References
Suzuki S, Yamashita T, Akao M, Okumura K and J-ELD (2020) AF Investigators. Clinical implications of assessment of apixaban levels in elderly atrial fibrillation patients: J-ELD AF registry sub-cohort analysis. Eur J Clin Pharmacol 76:1111–1124.
Okumura K, Yamashita T, Suzuki S, Akao M and J-ELD (2020) AF Investigators. A multicenter prospective cohort study to investigate the effectiveness and safety of apixaban in Japanese elderly atrial fibrillation patients (J-ELD AF Registry). Clin Cardiol 43:251–259.
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Acknowledgements
We would like to thank the J-ELD AF investigators for their support in patient registration and data collection in the main study used in this sub-cohort analysis. 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 by each author according to the Contributor Roles Taxonomy (CRediT):
SS: conceptualization, data curation, formal analysis, investigation, methodology, writing—original draft;
TY: conceptualization, funding acquisition, investigation, methodology, project administration, supervision, writing—review and editing;
MA: conceptualization, investigation, project administration, writing—review and editing;
KO: conceptualization, funding acquisition, investigation, project administration, supervision, writing—review and editing
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Compliance with ethical standards
Prior to the start of the main study, the investigators in charge received a review from the ethics committee of their main participating facility and acquired approval. Prior to enrollment, 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. The study plan and its design were registered in the UMIN Clinical Trials Registry (UMIN000017895).
Conflict of interest
SS received research funding from Daiichi-Sankyo and Mitsubishi-Tanabe. TY received lecture fees from Bristol Myers Squibb, Daiichi-Sankyo, Bayer, Pfizer, Ono Pharmaceutical, and Toa Eiyo, and research funding from Bayer and Daiichi Sankyo. MA received lecture fees from Pfizer, Bristol-Myers Squibb, Boehringer Ingelheim, Bayer Healthcare, and Daiichi-Sankyo. KO received lecture fees from Daiichi-Sankyo, Boehringer Ingelheim, and Johnson and Johnson.
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Suzuki, S., Yamashita, T., Akao, M. et al. Predictors for a high apixaban level in elderly patients with atrial fibrillation prescribed reduced dose of apixaban. Eur J Clin Pharmacol 77, 1757–1758 (2021). https://doi.org/10.1007/s00228-021-03135-8
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DOI: https://doi.org/10.1007/s00228-021-03135-8