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Aims: Switching non-adherent patients prescribed anticoagulant treatment to a regime with less monitoring could lead to significant non-adherence. Health beliefs are known to influence medication adherence; however, the extent of this influence is unknown in patients switched from vitamin-K antagonists (VKAs) to direct oral anticoagulants (DOACs). This study aimed to determine adherence to long-term therapy in patients switched from VKAs to DOAC due to low time in therapeutic range (TTR) and if adherence is associated with health beliefs., Methods: The Switching Study is a longitudinal observational cohort study following patients for at least 1-year. 254 patients anticoagulated with VKAs for stroke prevention in atrial fibrillation (AF) or secondary prevention of venous thromboembolism (VTE) and TTR < 50% were recruited from anticoagulation clinics at King's College Hospital, London, UK. All participants were switched to DOAC and had health beliefs measured at baseline with VKA, 1-month and 12-months after switching., Results: Of the 220 patients who completed 12-month follow-up 39% had sub-optimal adherence measured by self-report. 23% were non-adherent according to prescriptions issued. Increasing concerns about anticoagulation over time relative to beliefs about necessity was associated with lower self-reported adherence (OR = 0.902 95%C.I: 0.836, 0.974; p = 0.008). At baseline, believing that medications in general were overused in healthcare was negatively associated with adherence to DOAC (β = -1.5, 95%C.I: -2.7, -0.3; p = 0.013)., Conclusions: Although many patients who switched were adherent to therapy long-term, between 23 and 39% of patients exhibited sub-optimal adherence: these patients can be identified through their modifiable health beliefs at the time of switching., (Copyright © 2021 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Background Current UK and European guidelines recommend anticoagulated patients prescribed warfarin with time in therapeutic range (TTR) < 65% be considered for DOAC therapy. There has been considerable concern that adherence with DOACs may be poor compared with warfarin. Little is known about the patient experience of switching from warfarin to DOAC and how patients manage their DOAC long term. Our aim was to conduct focus groups exploring patient's previous experiences with warfarin, their current experience with DOACs, their adherence to DOACs and the long-term service provision they envisage. Methods Patients enrolled on the Switching Study who had been switched from warfarin to a DOAC > 1 year previously were invited to participate in focus groups. Two focus groups for atrial fibrillation (AF) and two for secondary prevention of venous thromboembolism (VTE) patients were held at anticoagulation clinics in South London, UK. Data was analysed using framework analysis to extract dominant themes. Results Five VTE patients and 15 AF patients attended the focus groups. Dominant themes that emerged were: indication specific anticoagulation prioritisation, warfarin as a necessary inconvenience, DOACs as the anticoagulant of choice, concerns regarding DOAC monitoring, high adherence to DOACs and desire for long-term access to specialist anticoagulation services. Discussion VTE patients prioritised anticoagulation over other therapies whereas AF patients did not. All participants reported high levels of adherence to DOACs. Patients derived confidence from long-term management in specialist anticoagulation clinics stating a preference to be managed in such a service. [ABSTRACT FROM AUTHOR]