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Transcatheter mitral valve implantation with Tendyne System Ten Years since the First In-Human Implant A systematic review

Abstract

Background

Transcatheter mitral valve replacement (TMVR) using the Tendyne™ valve is regarded as one of the most studied TMVR systems. The first human experience with the procedure was reported in 2013. The present study aims to systemically revise the published literature to document the global experience with TMVR using the Tendyne™ valve.

Methods

The present review was conducted in line with the PRISMA statement on systematic reviews. Database included in the search process were Scopus, Web of Science and Pubmed. Search was processed using multiple keywords combinations and was adjusted to English literature only.

Results

We included 26 articles in the final analysis reporting data from 319 patients. Patients recruited by the included studies comprised 192 males (60.2%) and 127 females (39.8%). In the studied patients, mitral annular calcification (MAC) was reported in 107 patients (33.5%). Preoperatively, MR grades 1,2 and 3–4 were reported in 3,5 and 307 patients respectively. Postoperatively, MR grades 1, 2 and 4 were reported in only 12, 3 and 1 patients respectively. Technical success was achieved in 309 patients (96.9%). Follow up durations widely varied among different studies from just days before discharge to 6 years. At the end of follow up, 79 patients died (24.8%) including 52 patients (16.3%) due to cardiovascular causes.

Conclusions

Management of mitral valve disease using the Tendyne system appears to be a promising minimally invasive option for many high-risk patients with accepted procedural feasibility and safety profile.

Peer Review reports

Introduction

Clinically significant mitral regurgitation (MR) is the most common valvular heart disease. The burden of the condition dramatically increases with older age [1]. Until recently, surgical repair and replacement were the standard therapeutic strategies. Considering the surgical high-risk profile of many patients, they were left without effective treatment options [2].

Over the past decade, technological advances continued to add multiple devices for transcatheter mitral valve repair and replacement with only few gained approvals by the healthcare authorities in Europe and the United States [3]. However, in view of the recent experience with these devices and the lack of long-term follow up studies, integrating their use into the standard treatment algorithms remains challenging [4].

Transcatheter mitral valve replacement (TMVR) using the Tendyne™ valve (Abbott Vascular, CA, USA) is regarded as one of the most studied TMVR systems. It’s a self-expanding prothesis with a double-frame design anatomically suited for the mitral annulus [5]. The first human experience with the procedure was reported in 2013 [6]. More recently, the Tendyne Global Feasibility Study has provided initial evidence of the procedural safety and efficacy over 2 years [7].

In Europe, the device has gained the CE mark [3]. In the United States, the ongoing randomized study “The Clinical Trial to Evaluate the Safety and Effectiveness of Using the Tendyne Mitral Valve System for the Treatment of Symptomatic Mitral Regurgitation (NCT03433274). is expected to test the advantage -if any- of Tendyne system over the standard conventional surgery [5].

Preoperative planning and patient selection

Appropriate selection of patients suitable for Tendyne valve implantation requires multimodal cardiac imaging using transthoracic and transesophageal echocardiography and contrast-enhanced gated computed tomography. Imaging aims to evaluate the function and morphology of the mitral valve (MV) with special emphasis on severity of mitral annular calcification (MAC), angle of aortic mitral curtain and left ventricular outflow (LVOT) size [5, 8].

The surgical technique

The Tendyne transcatheter valve is a self-expanding, fully retrievable and repositionable porcine valve. It’s composed of an inner circular stent frame and outer D-shaped stent frame. Both frames are made of nickel titanium alloy. The inner frame has only one size and has three leaflets. The outer frame has multiple sizes and has fabric cuff which sits at the annulus. The valve is anchored to the left ventricular apex by a tethered locking pad under guidance of fluoroscopy and transesophageal echocardiography under general anesthesia using the transapical approach through left minithoracotomy [8, 9].

The present study aims to systemically revise the published literature to document the global experience with TMVR using the Tendyne™ valve (Abbott Vascular, CA, USA).

Methods

Search methodology

The present review was conducted in line with the PRISMA statement on systematic reviews. Database included in the search process were Scopus, Web of Science and Pubmed. Search was processed using multiple combinations of the keywords (mitral valve, mitral regurgitation, transcatheter mitral valve, Tendyne system, Tendyne valve). Search was adjusted to include full-text journal articles published in English. Clinical studies of all types (Prospective, retrospective, comparative, etc.), case series and case reports were included. Retrieved records were published up to September, 2023. Selection criteria and search strategy and process were agreed by all co-authors.

Inclusion criteria

All articles of all types published in English with at least essential preoperative characteristics and early postoperative course were included in the study.

Exclusion criteria

Articles reporting Tendyne system data mixed with other TMVR systems or reporting data of patients included in other studies were excluded from final analysis.

Data extraction and presentation

Data extracted from selected articles included type of article, country of origin, number and sex of patients, baseline Society of Thoracic Surgeons predicted risk of mortality (STS-PROM), left ventricular ejection fraction % (LVEF), presence of mitral annular calcification (MAC), degree of preoperative and postoperative mitral regurgitation at the last follow up, previous implants or procedures, technical success, other technical notes, duration of follow up, early (30-day) and later complications and cardiovascular and all-cause mortality. Outcome parameters were reported according to recommendations of the Mitral Valve Academic Research Consortium [10]. Obtained data were presented as number and percent, mean and standard deviation or median and interquartile range.

Results

Characteristics of the included studies

We could identify 269 records through search of the three databases using different keywords combinations. After thorough assessment of these records, we selected 49 articles for further assessment of full text if required. Finally, we included 26 articles in the final analysis reporting data from 319 patients (Fig. 1). Included studies types, country of origin and number of participants are listed in Table 1.

Fig. 1
figure 1

Study flow diagram

Table 1 Characteristics of included studies (N = 26)

Baseline characteristics of the studied patients

Patients recruited by the included studies comprised 192 males (60.2%) and 127 females (39.8%). Patients’ age, STS-PROM and LVEF % are shown in Table 2.

Table 2 Baseline clinical characteristics of the included patients (N = 319)

Mitral valve characteristics in the included patients

In the studied patients, mitral annular calcification (MAC) was reported in 107 patients (33.5%). Preoperatively, MR grades 1,2 and 3–4 were reported in 3,5 and 307 patients respectively. Postoperatively, MR grades 1, 2 and 4 were reported in only 12, 3 and 1 patients respectively (Table 3).

Table 3 Mitral valve characteristics in the included patients (N = 319)

Technical parameters in the included patients

Technical success was achieved in 309 patients (96.9%). Four patients were previously submitted to failed Mitraclip insertion. Other technical parameters are shown in Table 4.

Table 4 Technical parameters in the included patients (n = 319)

Complications and mortality in the included patients

Follow up durations widely varied among different studies from just days before discharge to 6 years. At the end of follow up, 79 patients died (24.8%) including 52 patients (16.3%) due to cardiovascular causes. The most commonly reported complications included PVL, LOVTO and endocarditis (Table 5).

Table 5 Complications and mortality in the included patients (n = 319)

Discussion

Ten years after the first in-human implant of Tendyne system for management of MR, the present work sought to revise the published literature to evaluate how the technique evolved in terms of clinical value and technical development since its introduction. We included almost all the published articles whatever their types not to miss any piece of real-world experience with such a new devise.

As shown by our findings, the technology has been considered in more countries through Europe and North America. However, no reports from the rest of the world could be found to date. The barriers against wider use of such devices should be investigated. Probably, appropriate integration of minimally invasive devices in management of mitral valve disease into the standard treatment guidelines will encourage more surgeons to advocate their use.

In this review, we could easily recognize the promising potential of the Tendyne system in management of MR. After intervention was applied, only 1 patient was left with grade 4 MR while 10 and 2 patients had grade 1 and 2 MR respectively. These findings are limited by the short course of follow up. However, studies with the longest reported follow up duration including that of Duncan et al. [17], Gossl et al., [18], Muller et al., [7], Taramasso et al., [30], Wienemann et al., [33] and Wilde et al., [35] with a follow up duration ranging from almost one year up to six years showed also impressive results.

It’s clear that all patients included in this systematic review are of older age and most of them had deteriorated general condition and ventricular function and are unfit for surgery or other minimally invasive techniques. The availability of such minimally invasive procedure in this high-risk population adds a substantial value to treatment options. Notably, many patients included in our analysis were successfully submitted to Tendyne valve implantation after failed Mitraclip insertion [13, 25, 29, 32]. This highlights the value of the technology in complicated scenarios with limited options.

Remarkably, about one third of the patients evaluated in the present review had various degrees of MAC and almost all patients in the studies of Gossl et al. [18] and Wienemann et al. [33] had MAC. Apart from one patient, technical success was achieved and MR was resolved in all patients in both studies. After approximately 1 year of follow up, cardiovascular mortality was observed in 20.0% and 13.0% respectively.

Interestingly, the technology could also successfully in particularly challenging situations. Damian et al., [15] reported their experience with double aortic and mitral valves replacement. Also, Pozzoli et al., [25] elegantly documented their work with first case of valve-in-ring implanting a Tendyne in Cardioband.

Technically, the procedure showed remarkable procedural success rates and by time, surgeons could add many technical enhancements. In some situations, Laceration of the Anterior Mitral leaflet to Prevent Outflow ObtructioN (LAMPOON) procedure were done to improve the outflow tract [12]. In other cases, pre-dilatation with balloon valvuloplasty was found to be useful [30, 28] and neo-left ventricular outflow tract modification with alcohol septal ablation was also applied [31].

Paravalvular leak is considered the most common postoperative complications as noted by our review and in some instance may be so significant to induce systemic reactions [7, 18, 11]. In many cases, valve re-tensioning could successfully resolve the problem. Other reported complications included left ventricular outflow tract obstruction, hemolysis and endocarditis.

Generally, the Tendyne valve appears to have high rate of technical success and low rate of postoperative significant residual MR. However, similar to other TMVR devices, its use may be associated with relatively high rate of perioperative complications. In comparison with the transcatheter MV repair approaches e.g. MitraClip, the all-cause mortality and rehospitalization rate due to heart failure may be higher with TMVR devices [36].

In conclusion, management of mitral valve disease using the Tendyne system appears as a promising minimally invasive option for many high-risk patients with accepted procedural feasibility and safety profile. These conclusions may be limited by the short follow up period and lack of randomized controlled trials.

Data Availability

The datasets used and analyzed during the current study are available from the corresponding author on reasonable request.

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Open access funding provided by The Science, Technology & Innovation Funding Authority (STDF) in cooperation with The Egyptian Knowledge Bank (EKB).

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AA, TA, MA, MM, AT equally contributed to data acquisition and manuscript writing. AA, TA, MA, MM, AT revised tables and figures. All authors reviewed the manuscript.

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Correspondence to Ahmed Ahmed.

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Ahmed, A., Aziz, T.A.A., AlAsaad, M.M.R. et al. Transcatheter mitral valve implantation with Tendyne System Ten Years since the First In-Human Implant A systematic review. J Cardiothorac Surg 18, 315 (2023). https://doi.org/10.1186/s13019-023-02446-4

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