Cost effectiveness of rivaroxaban versus warfarin among nonvalvular atrial fibrillation patients in Saudi Arabia: A Single-Center retrospective cohort study

Cost-Consequence Analysis of Apixaban Versus Rivaroxaban for Managing Patients with Venous Thromboembolism in Saudi Arabia

BACKGROUND AND OBJECTIVE

Direct oral anticoagulants (DOACs) have been proven to be cost-effective for treating various conditions, including venous thromboembolism (VTE). Nevertheless, there are no studies assessing the cost-effectiveness of DOACs for VTE treatment in Saudi Arabia using real-world data. Hence, this study seeks to examine the costs and medical consequences of apixaban compared to rivaroxaban in treating VTE patients in Saudi Arabia.

METHODS

A retrospective cohort study was carried out in three tertiary care hospitals spanning from January 2016 to December 2020. The measure of effectiveness is defined as the likelihood of preventing the composite of VTE recurrence (rVTE), major bleeding (MB), or clinically relevant non-major bleeding (CRNMB) within 90 days of the indexed VTE event, and rehospitalization due to rVTE, MB, or CRNMB. The effectiveness was determined by calculating 1 minus the probability of experiencing the composite outcome. The incremental cost-effectiveness ratio (ICER) was computed from the perspective of the Saudi National Health System, therefore only direct costs were considered. The 95% confidence interval surrounding mean costs and effectiveness rates was calculated using the bootstrapping method. Sensitivity analyses were also carried out.

RESULTS

In the analysis, 367 patients were included, with 176 on apixaban and 191 on rivaroxaban. The average annual medication costs for apixaban and rivaroxaban were $547.05 and $577.77, respectively. The mean annual direct medical costs for apixaban and rivaroxaban were $6496.83 (95%CI 5748.86-7457.97) and $5528.58 (95%CI 4836.21-6024.52), respectively. Apixaban's and rivaroxaban's mean effectiveness rates were 0.91 (95%CI 0.87-0.96) and 0.77 (95%CI 0.71-0.83), respectively. This resulted in an ICER of $6916.07 for the prevention of an additional composite outcome when using apixaban instead of rivaroxaban. The use of apixaban for preventing composite outcomes has been found to be more effective but costlier in 94.81% of the bootstrap cost-effectiveness distributions compared to rivaroxaban. It was also found to be more effective and less costly in 5.19% of the bootstrap cost-effectiveness distributions.

CONCLUSION

Apixaban demonstrated superiority over rivaroxaban in preventing composite outcomes, encompassing rVTE, MB, CRNMB, and rehospitalization. Nevertheless, this was correlated with increased direct medical expenses. These findings emphasize the necessity of a well-rounded approach when choosing anticoagulants, considering both clinical effectiveness and economic considerations. This study's results are impactful for improving patient care and resource allocation, underscoring the pivotal role of cost-effectiveness in healthcare decision-making.

The Cost of Atrial Fibrillation: A Systematic Review

OBJECTIVES

Atrial fibrillation (AF) is the most common cardiac arrhythmia, with an increasing incidence and prevalence because of progressively aging populations. Costs related to AF are both direct and indirect. This systematic review aims to identify the main cost drivers of the illness, assess the potential economic impact resulting from changes in care strategies, and propose interventions where they are most needed.

METHODS

A systematic literature search of the PubMed and Scopus databases was performed to identify analytical observational studies defining the cost of illness in cases of AF. The search strategy was based on the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) 2020 recommendations.

RESULTS

Of the 944 articles retrieved, 24 met the inclusion criteria. These studies were conducted in several countries. All studies calculated the direct medical costs, whereas 8 of 24 studies assessed indirect costs. The median annual direct medical cost per patient, considering all studies, was €9409 (13 333 US dollars in purchasing power parities), with a very large variability due to the heterogeneity of different analyses. Hospitalization costs are generally the main cost drivers. Comorbidities and complications, such as stroke, considerably increase the average annual direct medical cost of AF.

CONCLUSIONS

In most of the analyzed studies, inpatient care cost represents the main component of the mean direct medical cost per patient. Stroke and heart failure are responsible for a large share of the total costs; therefore, implementing guidelines to manage comorbidities in AF is a necessary step to improve health and mitigate healthcare costs.