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Sinus rhythm restoration reverses tricuspid regurgitation in patients with atrial fibrillation: a systematic review and meta-analysis

Journal of Cardiothoracic Surgery volume 19, Article number: 411 (2024) Cite this article

Abstract

Background

Tricuspid regurgitation (TR) is a common valvular heart disease worldwide, and current guidelines for TR treatment are relatively conservative, as well as with detrimental outcomes. Restoration of sinus rhythm was reported to improve the TR severity in those TR patients with atrial fibrillation (AF). However, relevant research was limited. The aim of this meta-analysis was to evaluate the clinical outcomes of restoration of sinus rhythm in TR patients with AF.

Methods

In this study, PubMed, Web of Science, and Scopus databases were searched for study enrollment until July 2023. This study was designed under the guidance of Preferred Reporting Items for Systematic Reviews and Meta-Analyses. These studies containing the patient’s baseline characteristics, surgical procedure, and at least one of the clinical outcomes were included. The primary endpoint was TR grade during follow-up after restoration of sinus rhythm.

Results

Out of 1074 records, 6 were enrolled. Restoration of sinus rhythm is associated with a reduction of TR severity (TR grade, odds ratio 0.11, 95% confidence interval (CI): 0.01 to 1.28, P = 0.08, I2 = 83%; TR area, mean difference (MD) -2.19 cm2, 95% CI: -4.17 to -0.21 cm2, P = 0.03, I2 = 96%). Additionally, remolding of right heart with a significant reduction of tricuspid valve annulus diameter (MD -0.36 cm, 95%CI: -0.47 to -0.26 cm, P < 0.00001, I2 = 29%) and right atrium volume index (MD -11.10 mL/m2, 95%CI: -16.81 to -5.39 mL/m2, P = 0.0001, I2 = 79%) was observed during follow-up.

Conclusions

In conclusion, rhythm-control therapy could reduce TR severity in AF patients with TR and is associated with right heart remodeling.

Peer Review reports

Introduction

Tricuspid regurgitation (TR) is a common valvular heart disease worldwide, which has a high incidence of right heart failure and hospitalization for heart failure, as well as a high rate of complication and mortality [1]. A population-based cohort of patients with AF showed that nearly one-third developed moderate or greater TR over time [2]. The current guidelines for TR treatment are relatively conservative, mainly based on comprehensive treatment with diuretics. Isolated tricuspid valve surgery has higher mortality and morbidity than left-sided valve surgery, with perioperative mortality as high as 3 ~ 11%. Late referral, progression of heart failure symptoms, and right ventricular dysfunction suggest a poor prognosis [3,4,5,6].

TR is divided into primary and secondary according to the etiology, and secondary TR occupies the predominate position, which is accompanied with tricuspid annulus dilatation and leaflet tethering. Atrial functional TR has gradually captured attention in recent years [7]. Atrial functional TR is mediated by dilatation of the right atrium, and most cases are accompanied with long-standing atrial fibrillation (AF), which is associated with dilatation of the right atrium and tricuspid annulus [8]. It is worth noting that the population proportion of TR with AF is more than 80% in some transcatheter tricuspid valve intervention cohorts [9,10,11].

Previous studies have proved that AF predisposes patients to TR progression [2, 7]. The severity of TR and TR jet area were significantly improved during follow-up after radiofrequency ablation to restore sinus rhythm, and the improvement of TR may be related to the reverse remodeling of the right heart [12,13,14,15,16,17]. Although the worsening TR is associated with AF, there is limited research focused on the effect of restoring sinus rhythm on the TR severity. In this meta-analysis, we aimed to systematically review and analyze the effect of sinus rhythm restoration on the severity of TR.

Methods

Literature search and study enrollment

This study was designed under the guidance of Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) [18]. Ethics approval and informed consent were waived in this study. Two authors systematically searched Medline/PubMed, Web of Science, Scopus, Google Scholar, and ClinicalTrials.gov up to July 2023 to evaluate the efficacy of sinus rhythm restoration in alleviating TR in AF patients. The major medical subject heading used in this study were “tricuspid valve” and “atrial fibrillation”, the intact search strategy was shown in Supplementary Materials S1. English was set as a language restriction. The original study protocol was registered on the PROSPERO platform (CRD42023441368). Two independent investigators reviewed all titles and abstracts and selected potentially eligible papers. Eligible studies were further read in detail to assess inclusion or exclusion criteria. The reference lists of included studies were also further traced to identify other studies of potential interest. Any controversy regarding the inclusion of a paper was discussed until an agreement was reached. Letters, meeting reports, and personal communications were excluded from this study (Fig. 1). The risk of bias for each included study was assessed using the Newcastle-Ottawa quality assessment scale as shown in Supplementary Materials S1.

Fig. 1
figure 1

Preferred reporting items for systematic reviews and meta-analyses study flow chart diagram

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Inclusion criteria

Studies were enrolled when all the following criteria applied: (1) the study had to report the patient’s baseline characteristics, surgical procedure or detailed information, and at least one of the clinical outcomes we were interested in; (2) the number of enrolled patients was at least 15; (3) when the same group of patients was included in different studies, only the study containing the largest number of patients was included; (4) studies with concomitant valve surgery were excluded.

Data extraction

Information on study design, sample size, clinical and echocardiographic characteristics of patients, duration of follow-up, and clinical outcomes of interest were extracted from the selected studies. TR severity were graded qualitatively into 3 categories: no/mild, moderate, and severe. Any discrepancies were resolved by consensus.

Endpoints and definitions

The primary endpoint of this study was to evaluate the effect of restoration of sinus rhythm on the TR severity in TR patients with AF. The improvement of TR was defined as the patients with a residual TR grade of ≤ 1+. As secondary endpoints, we further evaluated the change in the echocardiographic changes during follow-up: tricuspid annular diameter, right atrium volume index, pulmonary artery systolic pressure, and left ventricular ejection fraction.

Statistical analysis

The sample means and standard deviation in the original research, which was present with the formation of Median (interquartile range), were estimated by Luo et al. [19]and Wan et al. [20]. Odds ratio (OR) with 95% confidence intervals (CI) and standardized mean differences (MDs) were used as summary statistics for the comparison of dichotomous and continuous variables, respectively. A random-effects model was used to obtain the OR and MD when significant heterogeneity was detected. Otherwise, the fixed-effect model was applied. Inverse-variance and Mantel–Haenszel fixed-effect methods were used for meta-analysis. The heterogeneity is described by using I2 test. The values of I2 as 25%, 50%, and 75% represent little, moderate, and substantial heterogeneity, respectively. Statistical significance was set at P < 0.05. Publication bias was assessed by funnel plots. All analyses were performed by Reviewer Manager (RevMan, version 5.3).

Results

Identification of studies and baseline characteristics

The literature retrieval process was shown in Fig. 1, a total of 1074 records were enrolled in this study, and finally 6 studies were included in this meta-analysis. There was no significant difference in age between both restorations of the sinus rhythm group and the control group (P = 0.35). In addition, the male ratio in the restoration of sinus rhythm group and control group was 69.4% and 67.0%, respectively. Other relevant baseline characteristics were shown in Table 1. Successful cardioversion and/or ablation were performed in the sinus rhythm group.

Table 1 Baseline clinical characteristics of the included studies
Full size table

Clinical outcomes

The severity of TR decreased after the restoration of sinus rhythm, which was identified by measurement of TR grade qualitatively (OR 0.11, 95%CI: 0.01 to 1.28, P = 0.08, I2 = 83%, Fig. 2A). Similarly, quantitative measurement of TR with TR area significantly decreased after rhythm-control treatment (MD -2.19 cm2, 95%CI: -4.17 to -0.21 cm2, P = 0.03, I2 = 96%, Fig. 2B). A significant remolding of the right heart was observed during follow-up, which was depicted with a reduced tricuspid valve annulus diameter (MD -0.36 cm, 95%CI: -0.47 to -0.26 cm, P < 0.00001, I2 = 29%, Fig. 3A) and right atrium volume index (MD -11.10 mL/m2, 95%CI: -16.81 to -5.39 mL/m2, P = 0.0001, I2 = 79%, Fig. 3B). Of note, the pulmonary artery systolic pressure did not change significantly (MD -0.95 mmHg, 95%CI: -4.87 to 2.96 mmHg, P = 0.63, I2 = 55%, Fig. 3C), paired with a slight significant increase in left ventricular ejection fraction (MD 4.09, 95%CI: 0.73 to 7.45, P = 0.02, I2 = 84%, Fig. 3D). The detailed clinical results were shown in Table 2. The publication bias was shown in Supplementary Materials S2.

Fig. 2
figure 2

Forest plot for the severity of tricuspid regurgitation after restoration of sinus rhythm. A, tricuspid regurgitation grade; B, tricuspid regurgitation area

Full size image
Fig. 3
figure 3

Forest plot for the assessment of echocardiographic outcomes during follow-up after restoration of sinus rhythm. A, tricuspid valve annulus diameter; B, right atrium volume index; C, pulmonary artery systolic pressure; D, left ventricular ejection fraction

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Table 2 Clinical results of the included studies
Full size table

Discussion

The natural history of the TR is associated with progressive symptoms and requires treatment with diuretics to alleviate symptoms. Isolated tricuspid valve surgery has a high risk of mortality and complications, and the evidence supporting transcatheter tricuspid valve intervention is also limited. In this study, we focused on the impact of sinus rhythm restoration on the reverse of TR severity in patients with AF. Our results suggest that restoration of sinus rhythm alleviates TR progression and reverses right heart remodeling.

TR severity and jet area, as well as mitral regurgitation jet area, are improved after catheter ablation in AF patients with significant TR after retrospectively analyzing consecutive 64 patients with functional TR in Nishiwaki S’s study [12]. Soulat-Dufour L et al. reported shrinkage of right atrium volume after catheter ablation, thereafter, multiple studies observed consistent findings with shrinkage of tricuspid valve annulus post-ablation [13, 14, 16]. In addition, the reverse remodeling of the right heart is also identified by echocardiography during follow-up, suggest that the underlying explanation of TR severity improvement. Nakatsukasa T et al. [15]pointed out that AF not only enlarges the right atrium but changes the shape and size of the tricuspid valve annulus after analyzing the tricuspid valve morphology by multi-detector row computed tomography. Rhythm-control therapy resulted in reverse remodeling of the tricuspid valve annulus and reduced right atrial volume, emphasizing the importance of early AF intervention to maintain the tricuspid valve complex structure [15]. A rhythm control strategy was advocated in the early stage since the ability to maintain sinus rhythm was inversely linked to the AF duration and enlarged right atrium volume. Sinus rhythm maintenance post-operation was proved to be the most significant determinant of TR reduction by multivariate analysis [17].

In the present study, we excluded studies in which left-sided valve surgery was combined with a Maze procedure. A significant reduction in the degree of TR has also been observed after concomitant mitral valve surgery with a Maze procedure [21,22,23]. Stulak JM et al. analyzed the clinical data of 33 patients who underwent mitral valve surgery with Maze surgery concomitantly and found that the degree of TR improved to 1.9 ± 0.9 (P = 0.078 versus preoperative) after surgery, and only 9% (3 of 33 patients) had advanced TR during follow-up. On the contrary, in patients who were without the Maze procedure concomitantly, the degree of TR deteriorated to 2.7 ± 0.9 during follow-up, and 45% (15/33) of the patients had aggravated TR. The multivariate regression analysis further confirmed that the Maze surgery was a protective factor for postoperative TR progression [23]. Similarly, Kim HK and colleagues found that 12.8% of patients who underwent left-sided valve surgery with a Maze procedure had postoperative TR deterioration, as compared with 38.8% of patients who without a Maze procedure [21].

The Maze procedure has an acceptable rate of sinus rhythm restoration and reduces long-term major adverse cardiovascular and cerebrovascular events in the treatment of severe TR and persistent AF [24]. TR patients with persistent AF who underwent tricuspid valve repair combined with Maze procedure were proved with a 10-year sinus rhythm rate of 55%, as well as with lower major adverse cardiovascular and cerebrovascular event rates at 15 years compared to those TR patients without the Maze procedure [25]. In mitral valve surgery patients with AF, performance with surgical ablation to restore sinus rhythm appears to be associated with lower risk-adjusted operative mortality than in those who do not undergo ablation [26]. Hence, a concomitant Maze procedure may act as a good choice when left-sided heart surgery is necessary.

Of note, not all patients with moderate to severe TR caused by AF benefit from rhythm control approaches. Tethering height was shown to be an independent risk factor for the late recurrence of AF and TR. TR patients with AF who are with tethering height less than 6 mm have satisfactory tricuspid valve function improvement after the restoration of sinus rhythm after catheter ablation [27]. Surgical ablation concomitant with tricuspid valve repair is advocated in TR patients with severe tethering height and less leaflets coaptation. Relatively young age and absence of late recurrence of AF are good predictors of TR improvement after successful ablation, and improvement of TR is associated with better clinical outcomes [28].

Permanent AF can induce TR through right atrium enlargement and subsequent tricuspid annulus dilation [29]. This study confirmed that continuous rhythm control was beneficial to delay the progression of TR. The effect of sinus rhythm restoration on alleviating TR is mainly driven by right heart remodeling and blocking the dilation process, which further confirms the bidirectional causal relationship between AF and TR [30]. Therefore, successful restoration and maintenance of sinus rhythm are extremely important for TR reversal, and the underlying mechanisms still need to be further studied. Both right-sided heart size and function improved after sinus rhythm restoration, and whether these improvements in size and function were a cause or a consequence of reduced TR grade requires further prospective studies in clinical or experimental models.

Limitation

This study suffers from the intrinsic limitations of all meta-analyses, especially the selection bias on account of the non-randomized nature of the enrolled research. Secondly, the original data of enrolled studies is not available, and the data could only be analyzed secondary. Although the end effects of different studies are similar, residual unexplained heterogeneity in their therapeutic effects cannot be ruled out. The enrolled patient number in this study is limited. Thirdly, the parameters evaluating the function of the right-sided heart and TR degree are relatively simple, tricuspid annular plane systolic excursion and fractional area change, TR jet width, inferior vena cava reflux, and other parameters are not reflected. TR grade is not assessed according to the echocardiographic guideline (mild, moderate, severe, massive, and torrential). At last, data regarding long-term follow-up survival and heart failure are lacking, and patients experienced AF recurrence during follow-up are also unknown.

Conclusion

Rhythm-control therapy could reduce TR severity in AF patients with TR and is associated with right heart remodeling.

Data availability

No datasets were generated or analysed during the current study.

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Acknowledgements

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Funding

This work was supported by National Natural Science Foundation of China (Grant NO. 82100383) and medical and health research project of Zhejiang province (Grant NO. 2024KY1317).

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  1. Department of Anesthesia, Affiliated Hangzhou First People’s Hospital, School of Medicine, Westlake University, Hangzhou, 310000, China

    Yufeng Zhan

  2. Department of Cardiothoracic Surgery, Naval Medical Center of PLA, Naval Medical University, Shanghai, 200052, China

    Ning Li

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Zhan Yufeng and Li Ning wrote the main manusdript text. All authors reviewed the manuscript.

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Zhan, Y., Li, N. Sinus rhythm restoration reverses tricuspid regurgitation in patients with atrial fibrillation: a systematic review and meta-analysis. J Cardiothorac Surg 19, 411 (2024). https://doi.org/10.1186/s13019-024-02891-9

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Journal of Cardiothoracic Surgery

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