Abstract
Objective
We studied prescription patterns for non-vitamin K oral anticoagulants (NOACs) in Norway between 2012 and 2015, and compared NOAC and warfarin patient characteristics such as age, gender and cardiovascular (CV) co-medications across reimbursed indications. Factors associated with NOAC prescribing in atrial fibrillation (AF) were also analysed.
Methods
All Norwegian patients (N = 156,124) who received at least one dispensed NOAC or warfarin prescription within the indications of AF, deep vein thrombosis and pulmonary embolism (DVT_PE) or prevention of venous thromboembolic events after a hip or knee surgery (VTE_surg) between 2012 and 2015 were included in the study. Descriptive statistics was applied to compare patient characteristics between NOACs and warfarin across indications and a logistic regression model was used to identify factors associated with NOAC prescribing in AF.
Results
NOACs and warfarin were most commonly prescribed in AF (83,729 patients in 2015), followed by DVT_PE (16,077 patients) and lastly in VTE_surg (4060 patients). In 2015, NOACs achieved a dominant (>50%) patient share over warfarin in AF and DVT_PE, and were prescribed in >80% of new oral anticoagulation (OAC) patients. Apixaban, despite its delayed market entry, emerged as the preferred NOAC in VTE_surg (46% share), whereas rivaroxaban captured a 43% patient share in DVT_PE. Warfarin patients were on average older and received more CV co-medication than NOAC patients in AF and DVT_PE. Age, gender and certain CV co-medications emerged as significant predictors of NOAC prescribing in AF. AF patients <70 years old had higher odds of NOAC prescribing (OR 1.19–1.29, depending on age category), in contrast to patients >74 years old (OR 0.51–0.77). Women had 32% higher odds of receiving a NOAC in AF.
Conclusion
NOACs achieved a dominant market share over warfarin within 3 years from receiving reimbursement in Norway. There were significant differences in patient characteristics between drugs and indications.
Similar content being viewed by others
References
Electronic Medicines Compendium (EMC). https://www.medicines.org.uk/emc/ Accessed Oct 2016.
Ruff CT, Giugliano RP, Braunwald E, Hoffman EB, Deenadayalu N, Ezekowitz MD, et al. Comparison of the efficacy and safety of new oral anticoagulants with warfarin in patients with atrial fibrillation: a meta-analysis of randomised trials. Lancet (London, England). 2014;383(9921):955–62. doi:10.1016/s0140-6736(13)62343-0.
Tereshchenko LG, Henrikson CA, Cigarroa J, Steinberg JS. Comparative effectiveness of interventions for stroke prevention in atrial fibrillation: a network meta-analysis. J Am Heart Assoc. 2016;5(5). doi:10.1161/jaha.116.003206.
Norwegian Medicines Agency. Reimbursement Reports. https://legemiddelverket.no/refusjon-og-pris/helseokonomiske-rapporter. Accessed Oct 2016.
Camm AJ, Accetta G, Ambrosio G, Atar D, Bassand JP, Berge E, et al. Evolving antithrombotic treatment patterns for patients with newly diagnosed atrial fibrillation. Heart (British Cardiac Society). 2016;. doi:10.1136/heartjnl-2016-309832.
Olesen JB, Sorensen R, Hansen ML, Lamberts M, Weeke P, Mikkelsen AP, et al. Non-vitamin K antagonist oral anticoagulation agents in anticoagulant naive atrial fibrillation patients: Danish nationwide descriptive data 2011–2013. Europace. 2015;17(2):187–93. doi:10.1093/europace/euu225.
Martinez C, Katholing A, Wallenhorst C, Freedman SB. Therapy persistence in newly diagnosed non-valvular atrial fibrillation treated with warfarin or NOAC. A cohort study. Thromb Haemost. 2016;115(1):31–9. doi:10.1160/th15-04-0350.
McNamee R. Regression modelling and other methods to control confounding. Occupational and environmental medicine. 2005;62(7):500–6, 472. doi:10.1136/oem.2002.001115.
Dohoo I, Martin W, Stryhn H. Methods in Epidemiologic Research, Chaper 16. VER Inc; 2012.
Strom BL, Kimmel SE, Hennessy S. Pharmacoepidemiology, Fifth Edition. Wiley; 2012.
Bjorck S, Palaszewski B, Friberg L, Bergfeldt L. Atrial fibrillation, stroke risk, and warfarin therapy revisited: a population-based study. Stroke. 2013;44(11):3103–8. doi:10.1161/strokeaha.113.002329.
Haim M, Hoshen M, Reges O, Rabi Y, Balicer R, Leibowitz M. Prospective national study of the prevalence, incidence, management and outcome of a large contemporary cohort of patients with incident non-valvular atrial fibrillation. J Am Heart Assoc. 2015;4(1):e001486. doi:10.1161/jaha.114.001486.
Prosthetics report by The Norwegian National Advisory Unit on Arthroplasty and Hip Fractures. 2016. http://nrlweb.ihelse.net/Rapporter/Report2016_english.pdf. Accessed Nov 2016.
Harenberg J, Marx S, Diener HC, Lip GY, Marder VJ, Wehling M, et al. Comparison of efficacy and safety of dabigatran, rivaroxaban and apixaban in patients with atrial fibrillation using network meta-analysis. Int Angiol. 2012;31(4):330–9.
Yao X, Abraham NS, Sangaralingham LR, Bellolio MF, McBane RD, Shah ND, et al. Effectiveness and safety of dabigatran, rivaroxaban, and apixaban versus warfarin in nonvalvular atrial fibrillation. J Am Heart Assoc. 2016;5(6). doi:10.1161/jaha.116.003725.
Coyle D, Coyle K, Cameron C, Lee K, Kelly S, Steiner S, et al. Cost-effectiveness of new oral anticoagulants compared with warfarin in preventing stroke and other cardiovascular events in patients with atrial fibrillation. Value Health. 2013;16(4):498–506. doi:10.1016/j.jval.2013.01.009.
Lip GY, Kongnakorn T, Phatak H, Kuznik A, Lanitis T, Liu LZ, et al. Cost-effectiveness of apixaban versus other new oral anticoagulants for stroke prevention in atrial fibrillation. Clin Ther. 2014;36(2):192–210.e20. doi:10.1016/j.clinthera.2013.12.011.
Pinyol C, Cepeda JM, Roldan I, Roldan V, Jimenez S, Gonzalez P, et al. A systematic literature review on the cost-effectiveness of apixaban for stroke prevention in non-valvular atrial fibrillation. Cardiol Ther. 2016;5(2):171–86. doi:10.1007/s40119-016-0066-2.
Zheng Y, Sorensen SV, Gonschior AK, Noack H, Heinrich-Nols J, Sunderland T, et al. Comparison of the cost-effectiveness of new oral anticoagulants for the prevention of stroke and systemic embolism in atrial fibrillation in a UK setting. Clin Ther. 2014;36(12):2015–28.e2. doi:10.1016/j.clinthera.2014.09.015.
Halvorsen S, Ghanima W, Fride Tvete I, Hoxmark C, Falck P, Solli O, et al. A nationwide registry study to compare bleeding rates in patients with atrial fibrillation being prescribed oral anticoagulants. Eur Heart J. 2016;. doi:10.1093/ehjcvp/pvw031.
Friberg L, Rosenqvist M, Lip GY. Evaluation of risk stratification schemes for ischaemic stroke and bleeding in 182,678 patients with atrial fibrillation: the Swedish Atrial Fibrillation cohort study. Eur Heart J. 2012;33(12):1500–10. doi:10.1093/eurheartj/ehr488.
Pancholy SB, Sharma PS, Pancholy DS, Patel TM, Callans DJ, Marchlinski FE. Meta-analysis of gender differences in residual stroke risk and major bleeding in patients with nonvalvular atrial fibrillation treated with oral anticoagulants. Am J Cardiol. 2014;113(3):485–90. doi:10.1016/j.amjcard.2013.10.035.
Granger CB, Alexander JH, McMurray JJV, Lopes RD, Hylek EM, Hanna M, et al. Apixaban versus warfarin in patients with atrial fibrillation. N Engl J Med. 2011;365(11):981–92. doi:10.1056/NEJMoa1107039.
Bruins Slot KM, Berge E. Factor Xa inhibitors versus vitamin K antagonists for preventing cerebral or systemic embolism in patients with atrial fibrillation. Cochrane Database Syst Rev. 2013(8):Cd008980. doi:10.1002/14651858.CD008980.pub2.
Connolly SJ, Ezekowitz MD, Yusuf S, Eikelboom J, Oldgren J, Parekh A, et al. Dabigatran versus warfarin in patients with atrial fibrillation. N Engl J Med. 2009;361(12):1139–51. doi:10.1056/NEJMoa0905561.
Hansen ML, Sørensen R, Clausen MT, et al. Risk of bleeding with single, dual, or triple therapy with warfarin, aspirin, and clopidogrel in patients with atrial fibrillation. Arch Intern Med. 2010;170(16):1433–41. doi:10.1001/archinternmed.2010.271.
Kirchhof P, Benussi S, Kotecha D, Ahlsson A, Atar D, Casadei B, et al. 2016 ESC Guidelines for the management of atrial fibrillation developed in collaboration with EACTS. Eur Heart J. 2016;37(38):2893–962. doi:10.1093/eurheartj/ehw210.
Fauchier L, Grimard C, Pierre B, Nonin E, Gorin L, Rauzy B, et al. Comparison of beta blocker and digoxin alone and in combination for management of patients with atrial fibrillation and heart failure. Am J Cardiol. 2009;103(2):248–54. doi:10.1016/j.amjcard.2008.09.064.
Turakhia MP, Santangeli P, Winkelmayer WC, Xu X, Ullal AJ, Than CT, et al. Increased mortality associated with digoxin in contemporary patients with atrial fibrillation: findings from the TREAT-AF study. J Am Coll Cardiol. 2014;64(7):660–8. doi:10.1016/j.jacc.2014.03.060.
National Institute for Health and Care Excellence (NICE). Atrial fibrillation: management 2014. https://www.nice.org.uk/guidance/CG180. Accessed Nov 2016.
Macle L, Cairns J, Leblanc K, Tsang T, Skanes A, Cox JL, et al. 2016 focused update of the Canadian cardiovascular society guidelines for the management of atrial fibrillation. Can J Cardiol. 2016;32(10):1170–85. doi:10.1016/j.cjca.2016.07.591.
Norwegian Medicines Agency. Reimbursement Codes. 2017. https://legemiddelverket.no/Documents/Refusjon%20og%20pris/Refusjon/Refkoder_individuell_refusjon_3a_februar_2017.pdf.
Acknowledgements
We thank Dr Karsten Bruins Slot of the Committee for Medicinal Products for Human Use (CHMP) and NOMA for his medical feedback and Sunil Modi of the University College London for his editorial assistance.
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Funding
No funding was used in the conduct of this study or preparation of the manuscript.
Conflict of interest
A.M. Urbaniak, B.O. Strøm, R. Krontveit and K.H. Svanqvist declare that they have no conflict of interest.
Electronic supplementary material
Below is the link to the electronic supplementary material.
Rights and permissions
About this article
Cite this article
Urbaniak, A.M., Strøm, B.O., Krontveit, R. et al. Prescription Patterns of Non-Vitamin K Oral Anticoagulants Across Indications and Factors Associated with Their Increased Prescribing in Atrial Fibrillation Between 2012–2015: A Study from the Norwegian Prescription Database. Drugs Aging 34, 635–645 (2017). https://doi.org/10.1007/s40266-017-0476-4
Published:
Issue Date:
DOI: https://doi.org/10.1007/s40266-017-0476-4