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Anticoagulant plus antiplatelet therapy for atrial fibrillation

Cost–utility of combination therapy with non-vitamin K oral anticoagulants vs. warfarin

Antikoagulation plus Thrombozytenaggregationshemmung bei Vorhofflimmern

Kosten-Nutzwert-Vergleich zwischen Nicht-Vitamin-K-abhängigen oralen Antikoagulanzien und Warfarin

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Abstract

Background

Emerging evidence indicates combination therapy with anticoagulants and antiplatelet agents for atrial fibrillation (AF) will be increasingly required. Numerous studies compare the efficacy and cost-effectiveness of anticoagulation alone in AF, i. e., non-vitamin K oral anticoagulants (NOACs) vs. warfarin. However, the addition of antiplatelet agents with their potential for decreasing thromboembolic stroke counter-balanced by an increased bleeding risk has received less attention. Thus, we evaluated the cost–utility of this combination therapy.

Method and results

We obtained event estimates from our recent meta-analysis of four randomized clinical trials designed to compare NOACs with warfarin in patients with AF. We examined patient subgroups within each trial that received antiplatelet therapy in addition to anticoagulation. Utilities were derived from the literature and cost estimates from the German health-care system. A decision tree was constructed and populated with these parameters. We used a 1-year time horizon because combination therapy is not recommended beyond this time. We calculated the incremental cost–effectiveness ratio (ICER) per quality-adjusted life-year (QALY). The derived ICER was 13,168.50 € per QALY. NOAC prices exerted considerable influence on the calculation. Nevertheless, there is potential for ICER shifts in favor of warfarin, e.g., if warfarin-mediated anticoagulation control is improved and thereby adverse events decrease. Conversely, if NOAC adherence decreases, adverse events could increase.

Conclusion

The derived ICER was 13,168.50 € per QALY, consistent with NOACs being cost-effective vs. warfarin when anticoagulation is used with antiplatelet agents.

Nevertheless, country-, practice-, and patient-related factors influence the ICER. Our cost–utility calculation should be used a starting point for decision-making.

Zusammenfassung

Hintergrund

Aktueller Evidenz zufolge ist die Kombinationstherapie aus Antikoagulanzien und Thrombozytenaggregationshemmern bei Vorhofflimmern (VHF) häufig und zunehmend. In zahlreichen Studien wird nur die Wirksamkeit und Wirtschaftlichkeit zwischen Nicht-Vitamin-K-abhängigen oralen Antikoagulanzien (NOAK) und Warfarin verglichen. Die Aufmerksamkeit richtet sich jedoch weniger auf die zusätzliche Gabe von Thrombozytenaggregationshemmern mit ihrem Potenzial eines verminderten Risikos für thromboembolisch bedingte Schlaganfälle bei gleichzeitig erhöhtem Blutungsrisiko. Daher untersuchten die Autoren das Kosten-Nutzen-Verhältnis dieser Kombinationstherapie.

Methoden und Ergebnisse

Aus der aktuellen Metaanalyse von 4 randomisierten klinischen Studien zum Vergleich von NOAK mit Warfarin bei VHF-Patienten wurden Ereignisschätzwerte der Patientensubgruppen mit zusätzlicher Thrombozytenaggregationshemmung ermittelt. Die Nutzwerte („utilities“) wurden der Literatur entnommen, die Kostenschätzwerte aus Daten des deutschen Gesundheitssystems. Ein Entscheidungsbaum wurde entwickelt und mit diesen Parametern bestückt. Die Autoren benutzten einen Ein-Jahres-Horizont, da die Kombinationstherapie darüber hinaus nicht empfohlen wird. Es wurde das inkrementelle Kosten-Effektivitäts-Verhältnis (ICER) pro qualitätskorrigiertem Lebensjahr („quality-adjusted life-year“, QALY) berechnet. Der ermittelte ICER-Wert betrug 13.168,50 € pro QALY. Die Preise für NOAKs beeinflussen den ICER beträchtlich. Trotzdem besteht ein Potenzial für Verschiebungen des ICERs zugunsten von Warfarin, z. B., wenn die Steuerung der Antikoagulation mittels Warfarin verbessert würde und somit weniger Komplikationen darunter aufträten bzw. wenn unter verminderter Compliance der NOAK-Therapie mehr Komplikationen aufträten.

Schlussfolgerung

Für die Kombinationstherapie eines Thrombozytenaggregationshemmers mit einem NOAK wurde ein ICER von 13.168,50 € pro QALY ermittelt, was als kosteneffizient angesehen werden kann, auch wenn in Deutschland keine festen Grenzwerte hierfür existieren. Dennoch beeinflussen landes-, praxis- und patientenbezogene Faktoren den ICER-Wert. Die vorliegende Kosten-Nutzwert-Berechnung sollte als Startpunkt für Entscheidungsfindungen dienen.

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Correspondence to K. Bode MD, MSc.

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K. Bode and P. Whittaker declare that they have no competing interests. J.M. ten Berg has received speaker’s fees from Astra Zeneca, BMS, Pfizer, the Medicines Company, Boehringer Ingelheim, and Lilly and has received a grant from Astra Zeneca and ZonMw. G. Hindricks reported grants for the Heart Center Leipzig from Abbott and Boston Scientific but has not received personal payments for his services.

This article does not contain any studies with human participants or animals performed by any of the authors.

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J.M. ten Berg and P. Whittaker shared senior authorship.

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Bode, K., Hindricks, G., ten Berg, J.M. et al. Anticoagulant plus antiplatelet therapy for atrial fibrillation. Herz 45, 564–571 (2020). https://doi.org/10.1007/s00059-018-4747-6

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