- Department of Cardiology, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
Background: Existing studies have shown that sacubitril-valsartan ameliorated atrial remodeling in atrial fibrillation (AF) and favored maintenance of sinus rhythm in patients with AF and heart failure. However, the effect of sacubitril-valsartan in patients with persistent AF is yet unknown. We aimed to evaluate the effect of sacubitril-valsartan on restoration and maintenance of sinus rhythm in patients with persistent AF who underwent electrical cardioversion (ECV).
Method: Consecutive patients with persistent AF who underwent ECV between 1 January 2016 and 30 September 2020 were investigated in this retrospective cohort study. All eligible patients were categorized into sacubitril-valsartan users and sacubitril-valsartan non-users based on whether they received treatment with sacubitril-valsartan or not. The endpoint was ineffictive ECV, defined as the composite of failure to terminate AF or any recurrence of AF during 30 days follow-up.
Results: A total of 76 patients were enrolled in this study, including 28 sacubitril-valsartan users and 48 non-users. Within a follow-up of 30 days after ECV, the endpoint had occurred in 7 (25%) of 28 sacubitril-valsartan users and 25 (52%) of 48 non-users. Significantly lower rate of ineffictive ECV in sacubitril-valsartan users compared with non-users was shown in Kaplan-Meier survival curves (P = 0.02; Log-rank test). Multivariate Cox regression analysis indicated that sacubitril-valsartan use (hazard ratio [HR], 0.35; 95% confidence interval [CI], 0.14–0.91), amiodarone use (HR, 0.32; 95% CI, 0.13–0.78), left atrial diameter ≤ 39 mm (HR, 0.21; 95% CI, 0.06–0.71) were independently associated with a decreased rate of ineffective electrical cardioversion.
Conclusion: Use of sacubitril-valsartan is associated with a significantly decreased risk of ineffective ECV compared with non-users in patients with persistent AF.
Introduction
Atrial fibrillation (AF), the most frequent type of clinical tachyarrhythmia, is correlated with an increased risk of stroke and heart failure (HF). Rate-control and rhythm-control therapy are two major therapeutic strategies for AF. Recently, studies have demonstrated that rhythm-control therapy can improve AF-related symptoms, prevent AF progression (1) and even reduce the risk of cardiovascular complications (2). The rhythm-control strategy may refer to a combination of treatment approaches, including antiarrhythmic medication, catheter ablation and electrical cardioversion (ECV) (3). Of these, ECV is recommended as first-line medical therapy for symptomatic patients with persistent AF (3). However, some studies reported ECV failed to restore sinus rhythm in 12–26% of persistent AF patients (4, 5), and the rate of AF recurrence is up to 57–63% within 30 days after ECV (6). Thus, there is a unmet need to identify better regimes on restoration and maintenance of sinus rhythm in patients with persistent AF who underwent ECV.
The electrical and structural atrial remodeling, characterized by atrial action potential duration (APD) shortening, reduction in atrial effective refractory period (ERP), atrial enlargement and fibrosis, is a crucial mechanism in maintenance and progression of AF (7–9). Increased left atrial size has been confirmed to be strongly associated with the failure of ECV in many studies (4, 10, 11). Renin-angiotensin-aldosterone system (RAAS) was involved in electrical and structural atrial remodeling during AF and development and progression of AF may be prevented by inhibiting the activity of the RAAS system (12, 13). Natriuretic peptides (NPs), including atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP), were found to play a role in AF (14). Previous study reported that recombinant human ANP could reduce the occurrence of postoperative AF (15).
Sacubitril-valsartan, a first-in-class angiotensin receptor neprilysin inhibitor (ARNI), has been shown to act on both RAAS and NPs (16). In 2012, the PARAMOUNT trial initially demonstrated a reduction in left atrial size after administration of sacubitril-valsartan in patients with heart failure with preserved ejection fraction (HFpEF) (17). Furtherly, experimental and clinical studies uncovered that sacubitril-valsartan could ameliorate atrial remodeling in AF (18) and favor maintenance of sinus rhythm in patients with AF and HF (19–21). Nevertheless, the effect of sacubitril-valsartan in patients with persistent AF is yet unknown. The aim of this study is to evaluate the effect of sacubitril-valsartan on restoration and maintenance of sinus rhythm in patients with persistent AF who underwent ECV.
Materials and Methods
Study Design and Participants
In this single-center, retrospective cohort study, we retrieved patient-level demographic and clinical data from the electronic medical record (EMR) system between 1 January 2016 and 30 September 2020. Deidentified information recorded in the EMR included demographic characteristics, comorbidities, symptoms, laboratory and imaging findings, drug prescriptions, ECV procedures, etc. Our study adhered to the Declaration of Helsinki guidelines. According to International Ethical Guidelines for Health-Related Research Involving Humans (22), The Research Ethics Committee of the Second Affiliated Hospital of Chongqing Medical University (Chongqing, China) approved the study and granted a waiver of informed consent. Patients aged at least 18 years were eligible for inclusion if they had a diagnosed persistent AF and received ECV. Persistent AF was defined as AF lasting more than 7 days or needing cardioversion for termination. We excluded individuals if they had: (1) Any of the following comorbidities including acute coronary syndrome, acute heart failure, rheumatic valvular heart disease, hypertrophic cardiomyopathy, dilated cardiomyopathy, or hyperthyroidism. (2) Previous cardiac surgery or AF catheter ablation within 3 months. (3) Showing symptomatic sinus bradycardia or junctional escape rhythm after ECV. (4) Any of new prescription or discontinuation of sacubitril-valsartan, amiodarone, or angiotensin-converting enzyme inhibitors (ACEI)/angiotensin receptor blockers (ARB) monotherapy during the follow up period.
Group Assignment
Eligible patients were categorized as sacubitril-valsartan users and sacubitril-valsartan non-users.
As documented in the EMR, sacubitril-valsartan was tried to modify the atrial substrate in patients with persistent AF. Sacubitril-valsartan users had received initiation (initial dosage, 50 or 100 mg twice daily) and uptitration (a target dosage of 200 mg twice daily or tolerated dose) regimens for sacubitril-valsartan, for at least 2 weeks before ECV.
Electrical Cardioversion Procedure
All patients underwent transesophageal echocardiography 24 h prior to ECV procedure to rule out the possibility of thrombus in the left atrium and left atrial appendage. Blood pressure, cardiac rhythm, and oxygen saturation were continuously monitored during the procedure. After sedation with diazepam, pads were positioned in antero-lateral configuration and transthoracic ECV was performed with biphasic shock using 200 J initially. If need, energy increase to 300 J. If AF persisted after two shocks, no more attempts of ECV were repeated.
Follow Up
The follow-up time was defined as the time from the beginning of ECV (day 1) to the date of 30 days after ECV. Anticoagulation was continued for at least 4 weeks after ECV. After the ECV procedure, all patients were hospitalized with continuous cardiac rhythm monitoring till discharge. A 12-lead electrocardiogram (ECG) or 24-h Holter recording was performed at 30-day follow-up and at any time the patient experienced irregular pulses or complained of palpitations or any other symptoms possibly related to the recurrence of AF after discharge.
Outcome
The endpoint of this study was ineffective ECV, defined as the composite of failure to terminate AF or any recurrence of AF during 30 days follow-up. Failure to terminate AF was defined as failure to achieve the presence of at least two consecutive sinus complexes after ECV. Recurrence of AF was defined as any episode of atrial tachycardia, atrial flutter or AF lasting at least 30 s confirmed by a 12-lead ECG or 24-h Holter after successful termination of AF.
Statistical Analysis
Continuous variables are presented as mean ± standard deviation (SD) and compared using independent-samples Student’s t-test if normally distributed. For continuous variables with a non-normal distribution, data are presented as median (interquartile range) and compared using the Mann-Whitney U test. The normality of data was assessed by Shapiro-Wilk normality test. Categorical variables are presented as percentage and compared with Chi-square or Fisher’s exact test. Survival curves were constructed using the Kaplan-Meier method and compared by the log-rank test. Univariate and multivariate analysis were performed using the Cox proportional hazards model. Variable selection for multivariate Cox regression model was based on sample size, variables considered to be clinically relevant and those with a p-value of <0.1 in univariate analysis. The receiver operating characteristic (ROC) analysis was performed to dichotomize continuous variables. If the area under the ROC curve (AUC) was greater than 0.5, the optimal cutoff value was defined by selecting the maximum Youden index. Otherwise, the optimal cutoff value was defined according to threshold of clinical significance. A p-value of <0.05 was considered statistically significant. All analysis were performed using R software (R version 4.0).
Results
Among the 142 patients, a total of 76 patients were enrolled in this study based on the inclusion and exclusion criteria, including 28 sacubitril-valsartan users and 48 non-users (Figure 1). The median age of all eligible patients was 67.0 (60.0–72.0) years, and 48 (63%) were male. None of the patients received cardiac glycosides or non-dihydropyridine calcium channel blockers therapy. Table 1 summarizes the differences in demographics and clinical characteristics among the two groups. Overall, sacubitril-valsartan users were not treated with either ACEI or ARB monotherapy and seemed to have a larger left atrial diameter (LAD) (P = 0.04), a lower serum concentration of serum Na+ (P < 0.001) and N-terminal pro-B-type natriuretic peptide (NT-proBNP) (P = 0.04), be less frequently treated with beta-blocker (P = 0.03). The remaining baseline characteristics between two groups were generally similar.
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Figure 1. Flowchart of the study. AF, atrial fibrillation; ECV, electrical cardioversion; ACEI, angiotensin-converting enzyme inhibitors; ARB, angiotensin receptor blockers.
After a follow-up of 30 days, the endpoint had occurred in 7 (25%) of 28 sacubitril-valsartan users and 25 (52%) of 48 non-users. A significantly lower rate of ineffictive ECV in sacubitril-valsartan users compared with non-users was shown in Kaplan-Meier survival curves (log-rank P = 0.02, Figure 2).
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Figure 2. Kaplan–Meier estimates of the ineffective electrical cardioversion among patients with persistent atrial fibrillation, according to sacubitril-valsartan use.
Univariate Cox regression analysis of potential factors for ineffictive ECV is shown in Figure 3. Sacubitril-valsartan, amiodarone, LAD, NT-proBNP were finally included in the multivariate Cox proportional hazard regression analysis. After adjusting for covariates, multivariate Cox regression analysis indicated that sacubitril-valsartan use (hazard ratio [HR], 0.35; 95% confidence interval [CI], 0.14–0.91), amiodarone use (HR, 0.32; 95% CI, 0.13–0.78), left atrial diameter ≤ 39 mm (HR, 0.21; 95% CI, 0.06–0.71) were independently associated with a decreased rate of ineffective electrical cardioversion. Complete multivariate model is presented in Figure 3.
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Figure 3. Parameters in uni- and multivariate analysis associated with ineffective electrical cardioversion performed with the Cox proportional-hazards model. CI, confidence interval; BMI, body mass index; EHRA, European Heart Rhythm Association; NYHA, New York Heart Association; eGFR, estimate glomerular filtration rate; NT-proBNP, N-terminal pro-B-type natriuretic peptide; ACEI, angiotensin-converting enzyme inhibitors; ARB, angiotensin receptor blockers.
Discussion
The main findings of our retrospective cohort study showed that use of sacubitril-valsartan was associated with a significantly decreased risk of ineffictive ECV in patients with persistent AF who underwent ECV. Additionally, we also found amiodarone use, LAD ≤ 39 mm were independent factors for ECV success.
Previous studies on sacubitril-valsartan mainly focused on the fields of HF and hypertension. Recently, several studies with preliminary clinical evidence have manifested potential antiarrhythmic effects of sacubitril-valsartan on AF (19–21, 23, 24). Two studies reported that sacubitril-valsartan was favorable for restoration and maintenance of sinus rhythm in cases with AF and HF (19, 20). In a recent study, De Vecchis et al. (21) showed that patients with chronic heart failure receiving sacubitril-valsartan therapy had significantly less episodes of AF recurrence and a significantly higher increase in average peak atrial longitudinal strain (26.5 vs. 22.5%), when compared to those who taking ACEI/ARB monotherapy. Russo et al. (23) demonstrated that, in dilated cardiomyopathy (DCM) patients with reduced ejection fraction who had a dual-chamber implantable cardioverter defibrillator (ICD), sacubitril-valsartan treatment was associated with a significant reduction in AF episodes (34 vs. 19, P = 0.03) and improvement in P wave sensing, atrial pacing threshold during a 12-month follow-up. Similarly, De Diego and colleagues observed that there was a trend for a reduction of paroxysmal atrial tachycardia or AF episodes (from 14 to 10%) in patients with HFrEF and ICD after the sacubitril-valsartan regimen (24). All of the above studies focused on patients with both AF and HF. To the best of our knowledge, this is the first study to investigate the role of sacubitril-valsartan in patients with persistent AF who underwent ECV. However, the exact mechanisms underlying such beneficial effects of sacubitril-valsartan on reduction in the risk of ineffictive ECV are not completely understood.
A limited number of studies suggest that inhibiting atrial electrical and structural remodeling, and facilitating the cardiac electro-mechanical reverse remodeling may be potential mechanisms of sacubitril-valsartan. In animal studies, Suo et al. (25) observed that as compared to ARB monotherapy, sacubitril-valsartan significantly attenuated left atrial fibrosis in a mice model. In a rabbit model (18), sacubitril-valsartan ameliorated the electrical remodeling of AF by inhibiting the reduction of L-type calcium current density and calcium overload, subsequently preventing atrial AERP and APD shortening. In addition, sacubitril-valsartan alleviated the structural remodeling of AF by inhibiting the up-regulation of collagen I and III levels, subsequently preventing atria fibrosis and enlargement (18). In the clinical setting, the PARAMOUNT trial demonstrated a greater reduction in left atrial size, indicative of reverse left atrial remodeling, in patients with HFpEF receiving sacubitril-valsartan compared with those receiving valsartan (17). Furthermore, a significant reduction in P wave dispersion and left atrial size was identified after treatment with sacubitril-valsartan (23, 26–28). Previous studies has shown that prolonged P wave dispersion was correlated with an increased risk of AF recurrence in persistent AF patient who underwent ECV (29, 30). Thus, we speculate that the effect of sacubitril-valsartan on the reduction in risk of ineffictive ECV might be associated with the reduction in P wave dispersion, which still requires to be confirmed by additional research.
Previous two randomized, open label studies have indicated that treatment with ACEI enalapril or ARB irbesartan in combination with amiodarone may reduce the risk of AF recurrence and facilitate long-term maintenance of sinus rhythm after ECV as compared with amiodarone alone in patients with persistent AF (31, 32). Meanwhile, the above studies (31, 32) mentioned that ACEI/ARB could prevent or modify atrial remodeling. Sacubitril-valsartan, contains the angiotensin receptor blocker valsartan and the neprilysin inhibitor prodrug sacubitril (16). This drug targets to inhibit the RAAS and decrease degradation of the NPs (33). NPs themselves exert many biological effects in the cardiovascular system, including anti-fibrosis, anti-inflammatory, inhibition of the renin-angiotensin and sympathetic systems (34, 35). Therefore, based on the pharmacological mechanisms of sacubitril-valsartan, it can be presumed that sacubitril-valsartan could also prevent or modify atrial remodeling through similar or even stronger effects as ACEI/ARB monotherapy. More recently, Carluccio et al. assessed changes in echocardiographically derived hemodynamic profiles induced by sacubitril-valsartan in a large consecutive series of patients with HF (36, 37). They found that an important role of sacubitril-valsartan on improvement cardiovascular hemodynamics including cardiac output and left ventricular filling pressure (36, 37), which might provide new insights into the underlying mechanism of effects of sacubitril-valsartan on restoration and maintenance of sinus rhythm for persistent AF.
Left atrial enlargement was proved to be an independent risk factor for AF recurrence in previous studies (4, 10, 11). The results of this study suggest that LAD ≤ 39 mm is associated with a significantly decreased risk of ineffictive ECV compared with that over 39 mm. Nevertheless, current evidence is inconclusive to define the optimal cutoff value of left atrial size in predicting AF recurrence (11, 38). Left atrial enlargement was associated with left atrial fibrosis, which is likely to result in regional conduction slowing and increased electrophysiological heterogeneity, subsequently providing a substrate for AF (39).
Results from clinical trials demonstrated that pretreated with antiarrhythmic drugs (AADs) before ECV could improve restoration and maintenance of sinus rhythm in persistent AF (40, 41), in agreement with our findings. In a recent meta-analysis of 8 studies, treatment with amiodarone was found to be associated with higher rates of restoration (relative risk [RR], 1.22; 95% CI, 1.07–1.39) and long-term maintenance (RR, 4.39; 95% CI, 2.99–6.45) of sinus rhythm (6).
A few limitations should be acknowledged in our study. First, the generalizability of our findings is only restricted to patients with persistent AF, and future studies are required to ascertain whether such benefits could be observed in paroxysmal AF. Second, continuous monitoring of cardiac rhythm after discharge was not feasible, and that might has resulted in missed asymptomatic episodes of AF, which might be a source of information bias. Third, the follow-up duration of this study was relatively short, and effect of sacubitril-valsartan on long-term maintenance of sinus rhythm awaits further exploration. Fourth, our data is insufficient for the dose-response analysis in sacubitril-valsartan users due to the limited sample size. Lastly, this retrospective cohort study with a limited sample size may introduce potential selection biases, and further well-designed prospective studies are warranted to validate our findings.
Conclusion
In conclusion, use of sacubitril-valsartan is associated with a significantly decreased risk of ineffictive ECV compared with non-users in patients with persistent AF. The findings of the present study indicate the potential value of sacubitril-valsartan in the rhythm-control management for persistent AF.
Data Availability Statement
The raw data supporting the conclusions of this article will be made available by the authors, without undue reservation.
Ethics Statement
According to International Ethical Guidelines for Health-Related Research Involving Humans, The Research Ethics Committee of the Second Affiliated Hospital of Chongqing Medical University reviewed and approved the study and granted a waiver of written informed consent.
Author Contributions
QC, YC, FQ, HD, and YY: concept and design. QC, YC, FQ, CG, BZ, NW, MX, ZO, WZ, and BC: acquisition, analysis, or interpretation of data. QC and YC: drafting of the manuscript. HD, MX, ZL, and YY: critical revision of the manuscript. All authors contributed to the article and approved the submitted version.
Funding
This work was supported by the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN202100457).
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, rhythm, electrical cardioversion, sacubitril-valsartan, treatment
Citation: Chen Q, Chen Y, Qin F, Du H, Gan C, Zhou B, Wang N, Xiao M, Ou Z, Zhao W, Cui B, Liu Z and Yin Y (2022) Effect of Sacubitril-Valsartan on Restoration and Maintenance of Sinus Rhythm in Patients With Persistent Atrial Fibrillation. Front. Cardiovasc. Med. 9:870203. doi: 10.3389/fcvm.2022.870203
Received: 06 February 2022; Accepted: 02 May 2022;
Published: 30 May 2022.
Edited by:
Knosalla Christoph, German Heart Center Berlin, GermanyReviewed by:
Nicola Riccardo Pugliese, University of Pisa, ItalyLuise Roehrich, Gemeinschaftskrankenhaus Havelhöhe, Germany
Copyright © 2022 Chen, Chen, Qin, Du, Gan, Zhou, Wang, Xiao, Ou, Zhao, Cui, Liu and Yin. 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: Yuehui Yin, yinyh@hospital.cqmu.edu.cn
†These authors have contributed equally to this work and share first authorship