Abstract
Background
Transcatheter mitral valve implantation (TMVI) with self-expanding (SAV) or balloon-expandable (BAV) valves are rising as promising treatment options for high-risk patients with symptomatic mitral valve (MVD) disease unsuitable for alternative treatment options.
Aims
The aim of this study was to examine the clinical, procedural and outcome parameters of patients undergoing SAV or BAV for MVD.
Methods
In this observational and single-center case series, fifteen consecutive patients treated with the Tendyne Mitral Valve System (SAV) and thirty-one patients treated with SAPIEN prosthesis (BAV) were included.
Results
The patients (aged 78 years [interquartile range (IQR): 65.5 to 83.1 years], 41% women, EuroSCORE II 10.3% [IQR: 5.5 to 17.0%] were similar regarding baseline characteristics, despite a higher rate of prior heart valve surgery and prevalence of MV stenosis in the SAV-group. At discharge, the SAV-group had a mean transvalvular gradient of 4.2 mmHg, whereas the BAV-group had a mean transvalvular gradient of 6.2 mmHg. None or trace paravalvular leakage (PVL) was assessed in 85% in SAV-group and 80% in the BAV-group. 320 day all-cause and cardiac mortality rates were comparable in both groups (SAV: 26.7% vs BAV: 20%, p = 0.60). Four deaths occurred early in the SAV-group until 32 days of follow-up.
Conclusions
In high-risk patients with MVD, TMVI presents a promising treatment option with encouraging mid-term outcomes and good valve durability. TMVI either with BAV or SAV may be developed to an established treatment option.
Graphical abstract
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Introduction
Mitral valve disease (MVD) is linked to a high morbidity and mortality [1]. Hitherto surgical valve repair or replacement represents the main treatment option [2, 3]. However, in a significant proportion of patients surgery is accompanied by risks due to extensive comorbidities including prior cardiac surgery. For these high-risk patients, catheter-based treatment options have been introduced into clinical practice. For patients unsuitable for mitral transcatheter edge-to-edge repair (M-TEER) or annuloplasty, transcatheter mitral valve implantation (TMVI) and transapical mitral valve implantation are potential therapeutic options. However, the value of these new treatment options needs to be assessed.
Currently, the balloon-expandable SAPIEN transcatheter heart valve (BAV, Edwards Lifesciences, Irvine, CA, USA) can be implanted in patients with bioprosthetic valve failure as valve-in-valve (VIV), in patients with ring failure as valve-in-ring (ViR) or can be implanted in mitral annular calcification (MAC) as valve-in-MAC (ViMAC) [4,5,6].
In addition, a growing number of dedicated transcatheter prostheses is available for transcatheter mitral valve implantation (TMVI) offering an alternative for patients with MVD and suitable anatomy. The Tendyne system (Abbott Cardiovascular, Plymouth, MN, USA) offers one promising self-expanding valve (SAV) technology. Recently, the 1- and 2-year follow-up data showed promising results with a sustained reduction in mitral regurgitation (MR) [7, 8]. But currently, direct real-world experience of these different treatment options in high-risk patients with MVD is sparse.
We sought to evaluate TMVI with SAV and BAV regarding clinical, hemodynamic, and echocardiographic outcomes in patients with mitral valve disease.
Methods
Study Population
This study included all consecutive patients undergoing either BAV (Edwards Lifesciences SAPIEN prosthesis) or SAV (Tendyne Mitral Valve System) between 12/2014 and 10/2021 at Cologne University Heart Center. Patients were symptomatic despite receiving efficient guideline-directed medical treatment and judged as high-risk for conventional mitral valve (MV) surgery by the multidisciplinary heart team but were eligible for TMVI. Patients undergoing concurrent intervention in the same procedure were excluded. Baseline demographic and clinical data were obtained from electronic medical records and recorded in a dedicated database.
Preoperative planning
All patients had transthoracic and transesophageal echocardiography to grade MR regurgitation (no/trace, mild, moderate, or severe) and mitral stenosis (MS) according to guideline recommendation [3, 9, 10]. The following parameters were measured: left ventricular ejection fraction, left ventricular end diastolic diameter, mean transvalvular pressure gradient, and pulmonary artery systolic pressure (PASP). Right ventricular function was measured by tricuspid annular plane systolic excursion. The criteria of the European Association of Echocardiography and the American Society of Echocardiography were used to describe the mechanism of bioprosthetic valve or ring failure [10]. Mixed failure was classified as having at least mild MR and MS. Coronary arteries were assessed either by invasive or computed tomography (CT) coronary angiography. Contrast-enhanced multidetector CT imaging was used for procedural planning using 3mensio software (3mensio Structural Heart, 3mensio Medical Imaging, Maastricht, The Netherlands) with a focus on annulus geometry, access assessment, left ventricular outflow tract (LVOT) size, mitral annular calcification (MAC) and left ventricular size. MAC was classified according to the definition by Guerrero et al. as none, mild, moderate or severe [11].
TMVI procedure with BAV
TMVI was performed through either a transseptal or transapical access. All patients in the BAV-group for ViV, ViR and ViMAC treatment underwent TMVI with the balloon-expandable SAPIEN XT, SAPIEN 3 or SAPIEN 3 Ultra (Edwards Lifesciences, Irvine, CA, USA). Balloon valvuloplasty before and after TMVI was performed at the discretion of the treating physicians. The patients were given antiplatelet treatment or anticoagulation in case of long-term anticoagulation indication before TMVI.
The Tendyne Mitral valve System and procedure
The Tendyne Mitral Valve System (Abbott Cardiovascular, Plymouth, MN, USA) is the only TMVI system with CE-mark. It consists of double frame device with a tether anchored to an apical pad [12]. An outer sealing stent incorporates a circular inner stent that contains a trileaflet self-expanding trileaflet porcine valve prosthesis sutured to a double nitinol frame. Different sizes and profiles are available to cover different anatomic conditions. The self-expanding Tendyne Mitral Valve Device is implanted under general anesthesia via a transapical approach inserting a 36-F sheath. The prosthesis is implanted in the native MV annulus with the tether connected to an epicardial pad over the apical puncture site without the need for rapid pacing. All patients were given oral anticoagulation with a vitamin K antagonist (INR 2.0–3.0) after the operation.
Data acquisition and follow‑up
Baseline, procedural, discharge information and survival data were collected during routine clinical practice using internal data and reported according to the Mitral Valve Academic Research Consortium (MVARC) standards [13]. Minor additions were made similar to Guerrero et al. Technical success at exit from hybrid operating room was defined as successful delivery and retrieval of the transcatheter delivery system via transapical or transfemoral access, deployment of a single valve in the correct position in the mitral annulus, no need for surgery or additional reintervention, and patient discharged alive from hybrid operating room. Device success at 30 days was defined as absence of mortality or stroke; and no migration, fracture, thrombosis, hemolysis or endocarditis with original valve in proper position; and freedom from unplanned surgical or interventional procedures linked to the device or access procedure; and a mean MV gradient < 10 mm Hg and residual MR less than moderate [14,15,16]. All patients gave informed consent for the procedures. The study was conducted in accordance with the principles contained in the Declaration of Helsinki and Good Clinical Practice guidelines. Approval was obtained from the institutional ethics board (22–1057). Follow-up was conducted according to clinical indications.
Statistical analysis
Continuous variables are presented as mean ± standard deviations or as median with interquartile range (IQR) from the 25 to 75th percentiles, if data were not normally distributed. Normal distribution was tested with QQ-plots and Shapiro–Wilk’s test. Categorical variables are shown as absolute values and percentages. Wilcoxon rank-sum test was applied for parametric group comparison. Patients were censored at death, at last follow-up or 320 days post implantation whichever occurred first. End points were estimated using Kaplan–Meier technique. The log-rank test was used to compare the groups. A two-tailed p value of < 0.05 was considered as statistically significant. Statistical analysis was conducted in SPSS Statistics (Version 27, IBM, Armonk, New York) and R environment (R version 4.1.3, R Foundation for Statistical Computing, Vienna, Austria).
Results
Baseline characteristics of patients
A total of forty-six patients were included. Median age of the entire cohort was 77.8 (IQR 65.5, 83.1) years and 59% (n = 27) were males. 90% of the patients presented with NYHA class III or IV. Comorbidities are displayed in (Table 1a). These conditions resulted in increased surgical risk of 10.3% (IQR 5.5, 17.0) according to the EuroSCORE II. Both treatment groups were similar regarding baseline comorbidities. Naturally, prior heart surgery was different with thirty patients (97%) in the BAV-group and in nine patients (60%) in the SAV-group. Additionally, more patients in the BAV-group (n = 13, 42%) had MV stenosis compared to SAV-patients (n = 0). In the BAV-group, one patient had severe MAC, nine patients (29%) presented with failed surgical rings, and twenty-one patients (68%) had deteriorated bioprosthetic valves. In the SAV-group, one patient had prior implantation of surgical ring, one patient underwent prior transcatheter edge-to-edge therapy and five patients had moderate or severe MAC (Table 1a). Severe mitral regurgitation was the treatment indication in ten (67%) out of fifteen patients in the SAV-group. Patients treated with BAV had higher mean pressure gradients than in the SAV-group (8.0 mmHg [IQR 6.0–10.3] vs 3.6 mmHg [IQR 3.0, 6.3]). Details regarding the echocardiographic parameters are provided in (Table 1b).
Procedural characteristics
Transapical access was chosen in four patients in the BAV-group out of 31 (13%). All procedures in the BAV-group were performed utilizing SAPIEN prostheses. SAPIEN 3 or S3 Ultra were used in 27 (87%) patients, whereas four patients (13%) received a SAPIEN XT. Technical success was achieved in all procedures (100.0%). Procedural characteristics for each patient are displayed in (Tables 2, 4a, b). Total procedural time in the SAV-group was longer compared to the BAV-group (145 [IQR 127, 217] vs. 93 [IQR 68, 120] minutes). In contrast, fluoroscopic time was shorter in the SAV- compared to the BAV-group (8.5 [IQR 6, 16] vs. 22 [IQR 14, 28] minutes, respectively). After the procedure, all patients were transferred to intensive care units.
Clinical outcomes and follow-up
Echocardiographic outcome
80% of the patients had none or trace PVL in the BAV-group and 84.6% in the SAV-group (Fig. 1). One SAV-patient showed severe paravalvular regurgitation besides correct device positioning in the discharge assessment (Table 4a). Mean gradient after mitral (6.4 ± 2.0 vs 4.2 ± 2.6 mmHg) valve replacement was numerically higher in ViV/ViR group compared to the SAV-group (Table 3a). One patient showed a moderate paravalvular leak and one patient a mean transvalvular pressure gradient of 11 mmHg in the BAV-group (Table 4b). Lower PASP could be observed in the entire cohort, reaching statistical significance between baseline and follow-up in the SAV-group (Fig. 2).
Mitral regurgitation (MR) severity was assessed at baseline (A) and paravalvular regurgitation (PVL) at discharge (B). At baseline, 55.0% of patients had MR moderate or severe in the group treated with a balloon-expandable valve. At discharge one patient of the fifteen (7.7%) treated patients with a self-expanding valve had severe PVL. MR mitral regurgitation, BAV balloon-expandable valve, PVL paravalvular regurgitation, SAV self-expanding valve
The mean systolic pulmonary artery pressure from baseline to follow-up after treatment with either a BAV (balloon-expandable valve) or SAV (self-expanding valve). Numerical decrease was observed in both groups, with statistical significance between baseline and follow-up for the SAV-group. BAV balloon-expandable valve, SAV self-expanding valve
Complications and mortality
No patient needed pacemaker implantation during the follow-up period in both groups. Total hospital stay duration did not differ between both groups. Life-threatening, or major bleeding occurred in 6 patients (40%) in the SAV-group and 4 patients (13%) in the BAV-group (Table 3b). In the SAV-group, one patient suffered from uncontrolled apical access bleeding leading to death on post-operative day 1. Two patients were in critical condition prior to valve treatment and died of cardiovascular causes on post-operative day 7 and 13 (Table 4a). One patient died of COVID pneumonia 32 days after the procedure. After 32 days, no further deaths were observed in the included SAV-group. Overall device success rate at 30 days was achieved in 12 of 15 patients (80%) in the SAV-group and 24 of 31 patients (77.8%) in the BAV-group. One patient with ViMAC had severe LVOT obstruction leading to mitral valve replacement via open heart surgery one day after the interventional procedure. Two patients died of cardiovascular cause and one of non-cardiovascular cause within the first 30 days in the BAV-group (Table 4b). All-cause mortality rates, therefore, were 26.7% and 20% for patients with available follow-up (Fig. 3). No valve migration, embolization or endocarditis were detected.
Discussion
The current study evaluated the contemporary treatment performance of TMVI either by BAV (SAPIEN-group) or SAV (Tendyne-group) in patients with severe MVD. The key findings can be summarized as follows: (1) In selected high-risk patients, SAV via a transapical approach is a feasible and effective treatment option that offers a valuable option for treatment of MVD, (2) SAV patients show low mean transvalvular gradient after procedure, (3) residual MR was more pronounced among patients undergoing BAV, (4) early after SAV, frail patients in reduced physical condition remain a special challenge with regard to mortality.
A broad spectrum of MVD pathologies can be treated by several options such as medical treatment [17], catheter-based interventions [3] or (redo) surgery [18]. There is a considerable need for treatment options due to increasing use of bioprostheses with high numbers of structural valve degeneration and longer life expectancy. The elevated risk of surgery in this particularly elderly cohort negatively impacts potential beneficial aspects [19]. The use of M-TEER is not applicable in all anatomies, and moderate or severe residual MR is present in around 5–8% of patients following this method [20, 21].
TMVI has emerged as a further alternative for patients with symptomatic MVD. Our current findings support the use of treatment by TMVI with SAV with comparable outcomes to BAV. It is important to note that these treatments are significantly different. Studies describing the direct comparison of BAV and the novel SAV have not been reported, because patients in each group offer different medical and surgical backgrounds.
However, both groups had similarities despite the different rate of prior heart surgery. Compared with the existing literature our cohort includes older patients with a high-risk profile as assessed by the EuroScore II. The risk profile of our present cohort is even higher compared to the largest existing reports for SAV with 6.5 ± 5.0 [22] in the Global Feasibility Study and 8.4 ± 6.1 in the TENDER register [23].
A relevant reduction of MR to less than mild was feasible in the vast majority of our patients undergoing SAV, which is consistent with several reported studies for the Tendyne device [7, 8, 23,24,25]. One patient experienced moderate–severe MR. This patient had complex anatomy with severe calcification of the mitral annulus.
In the BAV-group, 80% of the patients had none or trace MR, slightly lower compared with previous studies reporting that 90–94% of patients had less than mild MR [5, 6]. Overall experience increases for ViV, ViR and ViMAC with BAV and TMVI with SAV. In addition, consideration of wide anatomical sizes of the mitral annulus, MAC, variability of the sub valvular apparatus and shape of the mitral annulus is crucial for optimal results [26].
In our analysis, we observed a mean transvalvular gradient of 6.4 ± 2.04 in the BAV-group, which was in line with the findings of Simonato et al. [6], and higher compared to Guerrero et al. [15, 27]. The mean gradient in SAV-group was similar to the findings from the TENDER register [23] and slightly higher compared to the selected population in the Global Feasibility Study (2.9 ± 1.3 mmHg) [7].
One possible explanation for this finding could be the number of ViV and ViR cases among the BAV-group finally limiting the comparability of both groups regarding transvalvular gradient.
In the entire cohort LVOT-obstruction was exceptionally low. Using preoperative computerized tomography scan is crucial to prevent this complication. One patient experienced severe LVOT-obstruction after BAV leading to reoperation.
These challenges can be successfully overcome using the intentional anterior mitral leaflet laceration (LAMPOON) technique in patients treated with SAV [28]. In addition, a high transvalvular gradient might translate into a worse outcome as shown for the patient cohort after M-TEER [29]. However, literature concerning this topic is conflicting [30,31,32].
We added patients with severe TR, which were excluded in the first feasibility study [8] and with only a low number in the TENDER register [23]. PASP in these patients could be reduced highlighting the efficacy of these treatment options. One explanation for the significant reduction was the elevated PASP in the SAV-group. Pulmonary hypertension is frequent among patients with MVD caused by backwards transmission of elevated left atrial pressure. As shown for M-TEER reduction of PASP is feasible and might translate into better survival [33].
Of all patients included into the present analysis, only one patient had a stroke leading to an overall incidence rate of 3.2%. This low incidence rate can be supported with data from other groups [5, 8].
Length of intensive care unit and in-hospital stay were comparable among both groups, whilst overall duration was longer for the BAV compared to the current literature [34].
Given the high-risk profile of this investigated cohort, we observed a relevant post-procedural morbidity and mortality. A total of four deaths occurred early after intervention, 20.0% in the BAV- und 26.7% in the SAV-group. All patients that died in the SAV-group were at very high-risk with no other treatment option. Deaths occurred in the early postoperative phase, a finding that is similarly described in the Global Feasibility Study [7]. Nevertheless all-cause mortality rate was 26% during follow-up, which was in line with the experience of the single-center retrospective study by Ludwig et al. with 33% mortality rate at one year [24]. In contrast, in patients with BAV treatment mortality rate slightly increased after the initial month period. Zubarevich et al. report a 1-year mortality rate of 28%. Furthermore, they found only a minor increase to 37% after three years [35].
The transapical access incorporates a high-risk for the development for life-threatening complications. Of note, transapical access yielded a higher all-cause mortality at one year in comparison with transseptal access (21.7 versus 15.8%) in the TVT registry [36]. However, Nazir et al. did not find a difference regarding the 30-day mortality for both approaches [37]. This is important as the present design of the Tendyne valve does not allow a switch from transapical to transseptal implantation.
But not all complications are access related. Even with variant access strategies in the two distinct patient cohorts in our study, there is a relevant difference between technical success (100% in both groups) and device success at 30 days. Reasons for device failure are mostly patient related and not necessarily device related. Thus, it is important to report and discuss those cases in detail to increase our understanding of prognostic and clinical markers that can help to improve patient outcome and device success in the interventional treatment of complex MVD.
Overall, interventional treatment is superior to medical therapy as evidenced by a low all-cause mortality, which was observed after 1 year in patients either treated with TMVI or M-TEER compared to medical therapy [25].
Study limitations
This case series has several limitations related to its retrospective design, limited number of included patients and follow-up. The most common exclusion criteria include very severe left ventricular systolic dysfunction, anatomic or size problems and elevated risk of left ventricular outflow tract obstruction. The heterogeneity of our population may have incorporated bias and precludes definitive comparison of TMVI with SAV or BAV, therefore, data are presented as case series. Nevertheless, the present analysis reflects a real-world cohort, which is in our view important to objectively evaluate modern treatment strategies for MVD.
Conclusion
Under real-world conditions, TMVI with either SAV or BAV yields acceptable midterm outcomes with excellent hemodynamic results with a low incidence rate of paravalvular leak. Therefore, these two therapeutic options complement the existing therapy for MVD.
Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- BAV:
-
Balloon-expandable valve
- LVOT:
-
Left ventricular outflow tract
- MAC:
-
Mitral annular calcification
- MR:
-
Mitral regurgitation
- MS:
-
Mitral stenosis
- MVD:
-
Mitral valve disease
- MV:
-
Mitral valve
- M-TEER:
-
Mitral transcatheter edge-to-edge repair
- PASP:
-
Pulmonary artery systolic pressure
- PVL:
-
Paravalvular regurgitation
- SAV:
-
Self-expanding valve
- TMVI:
-
Transcatheter mitral valve implantation
- ViV:
-
Valve-in-valve
- ViR:
-
Valve-in-ring
- ViMAC:
-
Valve-in-mitral annular calcification
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Prof. Baldus and PD Dr. Adam received institutional grant support and speakers’ honoraria from Abbott medical. PD Dr. Kuhn received institutional grant support and speakers’ honoraria from Abbott medical. The other authors have no conflicts of interest to declare.
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Wienemann, H., Mauri, V., Ochs, L. et al. Contemporary treatment of mitral valve disease with transcatheter mitral valve implantation. Clin Res Cardiol 112, 571–584 (2023). https://doi.org/10.1007/s00392-022-02095-y
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DOI: https://doi.org/10.1007/s00392-022-02095-y