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Cost Effectiveness of Anticoagulation in Acute Coronary Syndromes

  • Systematic Review
  • Anticoagulation in Acute Coronary Syndromes
  • Published:
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Abstract

Background: The benefit of unfractionated heparin (UFH) added to aspirin in patients with acute coronary syndromes (ACS) was described more than 20 years ago. Ever since, a wide variety of anticoagulant drugs have become available for clinical use, including low-molecular-weight heparins (LMWH), direct thrombin inhibitors and selective factor Xa inhibitors.

Objective: The aim of this study was to critically review the available evidence on the cost and incremental cost effectiveness of anticoagulants in patients with ACS.

Methods: Studies were identified using specialist databases (UK NHS Economic Evaluation Database [NHS EED] and Cost-Effectiveness Analysis [CEA] Registry), PubMed and the reference lists of recovered articles. Only studies based on randomized controlled trials were considered for inclusion. Finally, 22 studies were included in the review.

Results: Enoxaparin is the only LMWHthat has been shown to reduce the risk of death or myocardial infarction in patients with non-ST-elevation ACS (NSTE-ACS). In economic studies based on the ESSENCE trial conducted in the late 1990s, enoxaparin was consistently associated with a lower risk of coronary events, a reduction in the number of revascularization procedures and a lower cost per patient thanUFH.However, these results refer to patients managed conservatively, with little use of thienopyridines and glycoprotein IIb/IIIa inhibitors, and the results are difficult to extrapolate to moderate-tohigh- risk patients managed with the present day early invasive strategy.

Available studies of LMWH in ACS with persistent elevation of ST-segment (STE-ACS) are limited to patients treated with thrombolysis. In this scenario, enoxaparin was shown to be a dominant alternative compared with UFH in a study based on the ASSENT-3 study and was considered an economically attractive alternative in three studies based on the ExTRACT-TIMI 25 study. However, these results should be interpreted cautiously due to the heterogeneity of the supportive randomized trials and the possible underestimation of bleeding costs.

The effectiveness and safety of bivalirudin, a direct thrombin inhibitor, were evaluated in the ACUITY study (NSTE-ACS patients managed invasively) and the HORIZONS-AMI study (STE acute myocardial infarction patients planned for primary percutaneous coronary intervention). Bivalirudin monotherapy was not inferior to heparin plus a glycoprotein IIb/IIIa inhibitor and reduced the risk of major bleeding. The economic evaluations based on these studies suggest that bivalirudin is an attractive alternative to heparin plus a glycoprotein-IIb/IIIa inhibitor.

In the OASIS-5 trial, compared with enoxaparin, fondaparinux reduced the mortality in patients with NSTE-ACS, probably because of a reduced risk of bleeding. In three economic evaluations of fondaparinux versus enoxaparin based on this trial, fondaparinux was the dominant strategy in two of them, and still economically attractive in a third.

Taken as a whole, the usefulness of economic studies of anticoagulants in patients with ACS is undermined by the quality of the evidence about their effectiveness and safety; the narrow spectrum of the analysed scenarios; the lack of economic evaluations based on systematic reviews; the limitations of sensitivity analyses reported by the available economic evaluations; and their substantial risk of commercial bias.

Conclusions: The available studies suggest that enoxaparin is an economically attractive alternative compared with UFH in patients with NSTE-ACS treated conservatively and STE-ACS patients treated with thrombolysis. Bivalirudin in patients with ACS treated invasively is cost effective compared with heparin plus a glycoprotein IIb/IIIa inhibitor. In patients with NSTEACS, fondaparinux is cost effective compared with enoxaparin. The usefulness of these results for decision making in contemporary clinical practice is limited due to problems of internal and external validity.

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Acknowledgements

This review was commissioned by the journal. The preparation of the manuscript was not supported by any external funding. The authors have no conflicts of interest that are directly relevant to the content of this review and the opinions expressed are those of the authors.

Dr Latour-Pérez contributed to the conception and design of the study; literature research; data extraction; data analysis and interpretation; and manuscript preparation and revision, and approved the final version of the manuscript.

Dra de-Miguel-Balsa contributed to the literature research; data extraction; data analysis and interpretation; and manuscript editing and revision, and approved the final version of the manuscript.

Dr Latour-Pérez is the guarantor of the overall content of this review.

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  1. Intensive Care Unit, Hospital General Universitario de Elche, Camí Vell de l’almàssera 11, 03203, Elche, Spain

    Jaime Latour-Pérez & Eva de -Miguel-Balsa

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Latour-Pérez, J., de -Miguel-Balsa, E. Cost Effectiveness of Anticoagulation in Acute Coronary Syndromes. PharmacoEconomics 30, 303–321 (2012). https://doi.org/10.2165/11589290-000000000-00000

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