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SYSTEMATIC REVIEW article

Front. Cardiovasc. Med., 18 September 2023
Sec. Thrombosis and Haemostasis
This article is part of the Research Topic Novel Therapies and Emerging Technology in Haemostasis and Thrombosis View all 5 articles

The safety and efficacy of direct oral anticoagulants among chronic kidney disease patients on dialysis with non-valvular atrial fibrillation: a meta-analysis

\r\nJerahmeel Aleson L. Mapili
Jerahmeel Aleson L. Mapili*Lloyd Christopher S. LimLloyd Christopher S. LimBianca M. VelandoBianca M. VelandoJaime Alfonso M. Aherrera\r\nJaime Alfonso M. Aherrera
  • Division of Cardiovascular Medicine, Department of Medicine, University of the Philippines - Philippine General Hospital, Manila, Philippines

Background: Individuals with chronic kidney disease (CKD) on dialysis are at an increased risk of stroke and embolic events especially in the presence of atrial fibrillation (AF). Vitamin K antagonists (VKA), including warfarin, have been used for decades for anticoagulation among CKD patients on dialysis with AF but recent evidence has shown increased bleeding. Direct oral anticoagulants (DOAC) have been emerging as an alternative to VKA which, based on several observational cohort studies, are at least as efficacious and safe as VKA. This meta-analysis looked into the safety and efficacy of DOACs compared to VKA among CKD patients on dialysis with non-valvular AF.

Methodology: This study used a random-effects meta-analysis using RevMan 5.4. PubMed, EMBASE, Cochrane Central Register of Controlled Trials, Cochrane Database of Systematic Reviews, and ClinicalTrials.gov were searched from their dates of inception to June 2023. The risk of bias was assessed using Cochrane RoB2 and the certainty of evidence was assessed using GRADE.

Results: This meta-analysis showed that DOACs when compared to VKA have no significant difference in terms of risk for major bleeding (RR = 0.81, 95% CI 0.46–1.43), ischemic stroke (RR = 0.5, 95% CI 0.19–1.35), and cardiovascular death (RR = 1.34, 95% CI 0.69–2.60).

Discussion: This meta-analysis adds to the growing body of evidence supporting that the use of DOACs has similar efficacy and safety outcomes in CKD patients on dialysis with non-valvular AF patients compared to VKA. The findings need to be replicated in larger and more adequately powered clinical trials in order to ascertain its level of evidence.

Introduction

Patients with end-stage kidney disease (ESRD) are at higher risk of stroke or systemic thromboembolism (1). Among individuals with chronic kidney disease (CKD), atrial fibrillation (AF) is associated with a six-fold increase in stroke risk and is associated with accelerated progression of CKD which leads to increased mortality (2, 3). AF remains as a common indication for anticoagulation in patients with chronic kidney disease (CKD) (4).

Warfarin, a vitamin K antagonist (VKA), has been used for anticoagulation in ESRD for decades but recent evidence has shown that it has an increased bleeding risk compared to those without anticoagulation in this particular population (5, 6). Direct oral anticoagulants (DOAC) are emerging as alternatives to warfarin among patients requiring anticoagulation for AF as several trials have shown superior efficacy and safety compared to warfarin among patients with CKD who are not on dialysis (7). However, the efficacy and safety of DOAC among patients with CKD on dialysis remains understudied. A meta-analysis in 2022 on one randomized trial and five retrospective cohorts showed that DOACs had similar efficacy and safety among AF patients on dialysis compared to VKA (7). As a corollary, several recommendations discourage the use of DOAC among patients on maintenance dialysis. Hence there are several ambiguities regarding its use in CKD.

Two recent trials, the AXADIA-AF NET 8 and RENAL-AF, have shown that apixaban and VKA had similar efficacy and safety profiles while the VALKYRIE study showed that a reduced dose of rivaroxaban significantly decreased the composite outcome cardiovascular events with less major bleeding complications compared with VKA (810). These three trials however were underpowered and were inconclusive with regard to the efficacy and safety of direct oral anticoagulants among patients on dialysis. This meta-analysis looked into the safety and efficacy of DOACs among CKD patients on dialysis with non-valvular AF.

Objectives

This meta-analysis assessed the following:

(1) Safety of direct oral anticoagulants in terms of major bleeding among chronic kidney disease patients on dialysis with non-valvular atrial fibrillation

(2) Efficacy of direct oral anticoagulants in terms reduction in ischemic stroke and cardiovascular death among chronic kidney disease patients on dialysis with non-valvular atrial fibrillation

Methodology

Study eligibility criteria

Inclusion criteria

The meta-analysis included the studies which met the following criteria: (1) Randomized controlled trial as its study design, (2) Intervention includes direct oral anticoagulant (regardless of mechanism of action), (3) Population are adults with atrial fibrillation on anticoagulation for stroke prevention with chronic kidney disease on maintenance dialysis, (4) Efficacy outcome reported includes ischemic stroke prevention, and (5) safety outcome reported should include major bleeding using any standard criteria.

Exclusion criteria

The meta-analysis excluded the studies if they met any of the following: (1) Study design is not a randomized controlled trial, (2) not in the English language or published in recognized international journals, (3) population includes patients with non-dialytic chronic kidney disease, (4) outcomes do not included those specified as key objective variables.

Literature search strategy

The PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines was used for the conduct of the literature search (11). An independent electronic search was performed by three investigators (JAM, LCL, and BMV) using PubMed, EMBASE, Cochrane databases, and ClinicalTrials.gov from their dates of inception to June 2023. The following search terms were used: “direct oral anticoagulant”, “novel oral anticoagulant”, “chronic kidney disease”, “dialysis”, “end-stage renal disease” as free text and/or as MeSH terms. Additionally, a maximally sensitive search was sought by using the search terms for randomized and clinical trials (12, 13). Furthermore, an independent review of reference lists was done to identify additional potentially relevant studies.

An independent review for duplicates were done by the three investigators (JAM, LCL, and BMV) after the initial electronic search to complete the identification phase. A review of abstracts alone was done for the screening phase. Studies which did not meet the inclusion criteria were outright ineligible for review. After screening the abstracts, a full-text review of eligible studies was done. Hence, studies which met the inclusion were included in the final meta-analysis.

In the event of discrepancy in the independent literature search, a consensus was made via a discussion and consultation with the fourth investigator (JMA).

Data extraction and critical appraisal

An independent review of each article by three investigators (JAM, LCL, and BMV) was done for data extraction of the variables for analysis. The study design, intervention, control, and outcomes were extracted from the full text articles including their appendices and supplementary files (if available).

The Revised Cochrane Risk-of-Bias Tool for Randomized Trials (RoB2) tool was used to assess the risk of bias in each study. This was independently assessed by three investigators (JAM, LCL, and BMV) (14). The risk of bias table is color coded as follows: green for low risk, orange for unknown risk, and red for high risk; an explanation for the risk of bias will also be provided in the tabulation.

Overall quality of evidence for each outcome were independently assessed by three investigators (JAM, LCL, and BMV) based on the Grades of Recommendation, Assessment, Development and Evaluation (GRADE) Working Group system (15).

Data synthesis and statistical analysis

Cochrane Review Manager version 5.4 was used for the data analysis (16). The relative risk (RR) was used as a summary statistic for dichotomous outcomes and was represented in the Forest plots with the 95% confidence interval.

For the overall summary statistic, the composite relative risk and 95% confidence interval is presented and is represented by the middle and width of the diamond, respectively. To assess heterogeneity, we used the I2 statistic with values greater than 50% considered as substantial heterogeneity. In the event of substantial heterogeneity, a subgroup analysis was done.

Results

Literature search

The consensus electronic literature search yielded a total of 344 studies. After the removal of 20 duplications, the remaining studies underwent primary screening of their abstracts. Following removal of 321 studies upon screening, three (3) studies underwent full-text review, and these three (3) were included in the final meta-analysis based on inclusion and exclusion criteria (Figure 1).

FIGURE 1
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Figure 1. PRISMA summary of literature search.

Description of selected studies

The three selected trials (Table 1) were similar in terms of their control arm (VKA to target INR 2-3) and pre-specified outcomes of interest but they differed in their respective intervention arms. The VALKYRIE and AXADIA-AFNET 8 trials utilized a reduced dose DOAC while the RENAL-AF trial utilized the standard dose DOAC with weight and age adjustments as needed.

TABLE 1
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Table 1. Comparison of selected trials.

Baseline characteristics

The baseline characteristics (Table 2) of each of the studies were similar between treatment and control groups individually but have slight differences when compared to each other. The mean age for each trial varied by around 5 years from each other but nonetheless the mean ranged from 68 to 80 years old. There was no difference in terms of baseline average CHADSVASC and HASBLED scores between and among the trials.

TABLE 2
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Table 2. Baseline characteristics of selected trials.

Safety outcomes

Major bleeding

In terms of safety, this meta-analysis showed that among patients on dialysis with atrial fibrillation there was no significant difference in terms of major bleeding (RR = 0.81, 95% CI 0.46–1.43). There was no noted heterogeneity (Figure 2A).

FIGURE 2
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Figure 2. Forest plots summarizing the effects of intervention.

Efficacy outcomes

Ischemic stroke

In terms of efficacy, there was also no noted significant difference in terms of reduction in ischemic stroke (RR = 0.5, 95% CI 0.19–1.35) (Figure 2B).

Cardiovascular death

Similarly, it was noted that there was also no significant difference between the two treatment groups (RR = 1.34, 95% CI 0.69–2.60) (Figure 2C).

Evaluation of studies

The risk of bias of the studies assessed using the Revised Cochrane Risk-of-Bias 2 tool for Randomized Trials (RoB2) showed that there was no risk of bias among all the studies included in this meta-analysis (Table 3). Hence overall, this meta-analysis had low risk of bias.

TABLE 3
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Table 3. Risk of bias table.

Using the GRADE approach to assess quality of evidence (Table 4), major bleeding and ischemic stroke had moderate quality of evidence based mainly on the insignificant treatment effect. The quality of evidence on cardiovascular death was deemed low due to insignificant results and the heterogeneity in the results between apixaban and rivaroxaban.

TABLE 4
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Table 4. Summary of findings.

Discussion

There is a huge debate regarding the anticoagulation strategy among patients with atrial fibrillation on chronic dialysis. There is a lack of consensus between the international guidelines (KDIGO 2012, ESC 2020, AHA/HRS 2019, CCS 2020, CHEST 2018), and most would either recommend a VKA or no anticoagulation while some guidelines state that standard or reduced dose apixaban may be used with caution (17) (Table 5). In general, NOACs are NOT recommended among patients with advanced CKD (CrCl < 15 ml/min), more so those on hemodialysis. In 2018, apixaban (at 5 mg BID) use has been approved by US FDA for AF in ESRD but has only been supported by pharmacokinetic studies. Hence this clinical scenario had to be elucidated even further. Based on the available evidence, this is the first meta-analysis which investigates the efficacy and safety profiles of DOACs vs. VKA in patients with AF undergoing dialysis which only analyzed randomized controlled trials.

TABLE 5
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Table 5. Comparison of current guidelines.

This meta-analysis showed that direct oral anticoagulants have no significant difference in terms of risk for major bleeding, ischemic stroke, and cardiovascular death. As previously mentioned, the three randomized controlled trials were rather underpowered individually and the confidence interval of each of the studies were rather wide. It can be noted however that in our pooled analysis, with more power from the increase in the sample size to a total of 341, the confidence interval invariably narrows for each of the respective outcomes of interest. A recent meta-analysis done in 2022, which included the VALKYRIE trial and five other observational studies, showed that the use of DOAC, especially rivaroxaban or apixaban, showed at least similar efficacy and safety among AF patients on dialysis (7).

In terms of bleeding risk, the pooled analysis showed no significant difference but it should be noted that the AXADIA-AFNET 8 and VALKYRIE trials showed a trend towards less major bleeding while the RENAL-AF trial showed a trend towards increased risk of bleeding. This can be due to the differences in dosing used in the trials and the time in therapeutic range (TTR) achieved in each trial. It should be noted that the two trials which showed a trends towards less bleeding utilized a reduced dose DOAC with apixaban 2.5 mg BID and rivaroxaban 10 mg OD respectively while the RENAL-AF trial utilized a standard dose apixaban 5 mg BID. It should also be noted that the TTR for patients in the VKA arm was low at 44.3% in the RENAL-AF trial indicating that the estimate for bleeding events may be underestimated in the VKA arm. In contrast, the VALKYRIE Trial had a larger TTR of 48% at 6 months, was steady at 55%–69% from month 6 to 54, and increased to 87% at 54–60 months. Meanwhile, the AXADIA-AF NET 8 had a TTR of 50.7% in the VKA group. These differences in TTR in the VKA arm may be a key factor explaining why the RENAL-AF trial trended towards an increased risk of bleeding with DOAC use. Indeed, achieving an acceptable TTR is also a difficulty several trials face when comparing DOAC and VKA. Currently, there is an ongoing trial, the SAFE-D Trial, which seeks to compare standard dose apixaban vs. reduced dose apixaban vs. VKA among AF patients on dialysis with a potential to further elucidate on these dose discrepancies (18).

Our meta-analysis suggests that rivaroxaban has a lower risk of bleeding when compared to apixaban but, in a retrospective cohort study of the Danish nationwide cohort in 2020, it was shown that rivaroxaban is associated with a higher risk of bleeding compared to apixaban (19). In another retrospective study in 2018, the ARISTOPHANES Study, the rates of major bleeding are also higher in the rivaroxaban group compared to the apixaban group (20). However, these studies did not indicate the percentage of the population with CKD on dialysis and hence cannot be generalized in this population. Indeed further studies need to be done in order to ascertain the safety profiles of each of the DOACs especially when compared against each other and especially in the context of CKD on chronic dialysis.

In terms of ischemic stroke risk reduction, it can be noted that all three trials showed a trend towards reduction of events and when taken as a whole, the confidence interval narrows even further. In the previously mentioned meta-analysis done in 2022, it was shown that there was no significant risk reduction for ischemic stroke with DOAC compared to VKA but was leaning toward the side of benefit (7). Based on these, there are indeed signals that DOACs, particularly the factor Xa inhibitors, are particularly more efficacious than VKA in preventing ischemic stroke in dialysis patients with AF.

In a retrospective study in 2018, standard-dose apixaban (5 mg BID) was associated with significantly lower rates of ischemic stroke compared to either warfarin or low-dose apixaban (2.5 mg BID). In addition, apixaban, irrespective of the dose used, was associated with lower major bleeding rates than warfarin further supporting the fact that apixaban may well be a safe alternative among AF patients on dialysis (21).

The findings on cardiovascular death outcomes are inconsistent and based on the Forest plots it seems that a reduced dose rivaroxaban is associated with a decreased risk of cardiovascular death when compared to apixaban at either dose. Among the DOACs, it has been shown that a low dose rivaroxaban (5 mg daily) on top of antiplatelet therapy is associated with a reduction in cardiovascular events among those with atherosclerotic cardiovascular disease on antiplatelet therapy (22). In addition, the AFIRE trial has shown that rivaroxaban at reduced dose of 10 mg OD was non-inferior to rivaroxaban plus antiplatelet therapy among patients with AF and stable ischemic heart disease in terms of reduction of cardiovascular events and was likewise associated with a decreased risk of bleeding (23). These observations seen with rivaroxaban have not been replicated with the other DOACs and suggests that rivaroxaban may be the DOAC of choice in terms of cardiovascular risk reduction. These studies however failed to include patients with CKD on dialysis and hence cannot be totally applicable to this subgroup.

It should also be noted that randomized trials utilizing edoxaban and dabigatran were not retrieved from the literature search and currently there are no trials on patients on hemodialysis with AF using these two agents. It can be noted that all DOACs are eliminated by the kidneys in varying degrees wherein dabigatran is 80% renally excreted and edoxaban is 50% renally excreted rivaroxaban and apixaban are renally excreted at rates of 35% and 27% respectively based on pharmacokinetic studies. This may shed light as to why rivaroxaban and apixaban are the two main DOACs used in the retrieved trials in this meta-analysis and is also what is reflected in real-world clinical practice.

Based on the results of this meta-analysis and the current evidence from several observational cohort studies, there is still a large gap in our understanding of the use of DOACs among patients with AF on chronic dialysis. Our meta-analysis has its limitations mainly from the inclusion of only three studies and having a pooled population of 341. Nonetheless, the results of our pooled analysis show promising results which need to be replicated in larger and more adequately powered randomized clinical trials with population sizes approximating the pooled analysis of 350 or more in order to ascertain the level of evidence. However, due to the ambiguity in the evidence available at present, there is still hesitancy regarding the enrollment of patients into these types of trials and thus poses challenges to present and future investigators.

Conclusion

In conclusion, our meta-analysis adds to the growing body of evidence regarding the use of DOACs in AF patients on chronic dialysis. As already highlighted in previous observational cohort studies and meta-analyses of these cohort studies, DOACs are at least as efficacious and safe among patients with CKD on dialysis needing anticoagulation for non-valvular AF. Being a pooled analysis of smaller trials, our meta-analysis likewise provides more power and higher level of certainty to their individual findings. To shed more light on the topic, we recommend that larger scale multi-center randomized clinical trials be pursued.

Data availability statement

The original contributions presented in the study are included in the article/Supplementary Material, further inquiries can be directed to the corresponding author.

Author contributions

JM: Conceptualization, Data curation, Formal Analysis, Methodology, Resources, Writing – original draft, Writing – review & editing. LL: Conceptualization, Writing – original draft, Writing – review & editing. BV: Conceptualization, Writing – original draft, Writing – review & editing. JA: Conceptualization, Methodology, Supervision, Validation, Writing – original draft, Writing – review & editing.

Funding

The author(s) declare that no financial support was received for the research, authorship, and/or publication of this article.

Conflict of interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Publisher's note

All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.

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Keywords: atrial fibrillation, direct oral anticoagulant, chronic kidney disease, dialysis, end-stage renal disease (ESRD)

Citation: Mapili JAL, Lim LCS, Velando BM and Aherrera JAM (2023) The safety and efficacy of direct oral anticoagulants among chronic kidney disease patients on dialysis with non-valvular atrial fibrillation: a meta-analysis. Front. Cardiovasc. Med. 10:1261183. doi: 10.3389/fcvm.2023.1261183

Received: 19 July 2023; Accepted: 4 September 2023;
Published: 18 September 2023.

Edited by:

Claire S. Whyte, University of Aberdeen, United Kingdom

Reviewed by:

Mohammed Faisaluddin, Rochester General Hospital, United States
Bartosz Krzowski, Medical University of Warsaw, Poland

© 2023 Mapili, Lim, Velando and Aherrera. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Jerahmeel Aleson L. Mapili jlmapili@up.edu.ph

Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.