Types of Transcatheter Aortic Valve Replacement Devices: Comparison
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Please note this is a comparison between Version 2 by Camila Xu and Version 1 by Alessandro Spirito.

Transcatheter aortic valve replacement (TAVR) was originally conceptualized in the early 1990s, largely inspired by the pioneering experiences in the field of percutaneous transluminal coronary angioplasty.

  • transcatheter aortic valve replacement
  • aortic stenosis
  • aortic regurgitation

1. Introduction

Aortic stenosis (AS) is the most common acquired heart valve disease in developed countries, affecting up to 10% of elderly patients [1]. The prevalence of AS is expected to increase over the next decades with the increasing life expectancy in most developed countries. Indeed, the global number of people older than 80 is foreseen to triple and surpass 400 million by 2050, with AS prevalence expected to be growing at a similar rate [2]. AS has a 50% mortality rate at 5 years from symptom onset if left untreated [3]. Until recently, surgical aortic valve replacement (SAVR) represented the only definitive treatment for patients with AS, as medical therapy can only mitigate symptoms. Nonetheless, considering the frailty and the relevant burden of comorbidities of many elderly patients with symptomatic AS, a considerable portion of this population was left untreated, due to high or prohibitive surgical risk. Transcatheter aortic valve replacement (TAVR) was originally conceptualized in the early 1990s [4], largely inspired by the pioneering experiences in the field of percutaneous transluminal coronary angioplasty. Following different studies in animal models [5], the first TAVR procedure was performed in 2002 for the treatment of AS in a patient with several comorbidities and cardiogenic shock. [6] Since then, TAVR has revolutionized the treatment of patients with severe, symptomatic AS, as randomized controlled trials have shown similar, if not superior, outcomes following TAVR as compared with SAVR in selected patients [7,8][7][8]. TAVR first emerged as a plausible treatment option for patients with AS at high or prohibitive surgical risk. Due to major advances in TAVR technologies, subsequent trials have shown that it is a safe and effective alternative to surgery for patients at intermediate-to-low surgical risk [8,9][8][9]. The number of TAVR procedures is rapidly increasing, and the continuous expansion of the population deemed suitable for TAVR [10,11][10][11] has corresponded with an impressive constant evolution in TAVR devices and materials. Indeed, these advances have significantly reduced periprocedural complications, making it safe to shorten hospital stay and improve long-term outcomes [12,13][12][13]. Moreover, these progresses have resulted in a wide armamentarium at ouresearchers' disposal, including bioprostheses presenting different dimensions, designs, and deliverability, providing the opportunity to select a device based on each patient’s clinical and anatomic characteristics. In addition, as TAVR comes of age, clinical indications for TAVR are gradually expanding, from elderly and comorbid patients affected by calcific AS to younger patients, with bicuspid aortic valve, bioprosthesis degeneration, and/or aortic regurgitation (AR), all conditions that potentially require devices with specific features.

2. Types of Transcatheter AVR ortic Valve Replacement (TAVR) Devices

Since the first transcatheter implantation of the aortic Cribier–Edwards valve (Edwards Lifesciences, Irvine, CA, USA) in 2002 [6], several new transcatheter heart valves (THV) were introduced and approved for clinical use. The development of a safe and efficacious THV is technically challenging, as the valve must be crimped before implantation and then deployed over a heavily calcified aortic valve. Over time, improvements in valve design, materials, and delivery systems facilitated the implantation of the valve in the desired position, and decreased procedural and periprocedural complications [14]. For example, the sheath size for the delivery system was reduced from 24 to 12–14 Fr to enable implantation through a narrower vascular access and to reduce vascular complications. Sealing technologies, such as an outer skirt or a pericardial wrap, contributed to reduce the rates of paravalvular leak (PVL). Moreover, frame height was decreased, and the sizes of frames’ upper cells were enlarged to facilitate continued coronary access [15,16][15][16]. THV consist of a three-leaflet valve, made of bovine or porcine pericardium or polymeric material, mounted on a radiopaque metallic scaffold (frame), made of stainless steel, nitinol, or cobalt–chromium, and wrapped by an outer sheath (skirt or wrap)—in pericardial or polymeric material—to increase the surface area contact between the device and the native valve, and mitigate the risk of significant PVL (Figure 1). According to the position of the prosthetic leaflets relative to the native valve annulus, the THV is labeled as supra- or intra-annular. Supra-annular valves usually result in a larger effective orifice area (EOA) and lower transvalvular aortic mean gradients than intra-annular THV, which have a lower frame height that eases coronary access. Some THVs can be recaptured and repositioned after implantation, while other THV are non-repositionable after deployment. The delivery systems differ regarding the degree of flexion of the distal catheter and sheath diameter. The most common delivery approach is transfemoral, but other access routes (i.e., trans-subclavian, transaortic, transapical, transcarotid and transcaval) are used, as iliofemoral and aortic vessel diseases are commonly present in TAVR patients.
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Figure 1. Main features of balloon–expandable and self–expanding aortic transcatheter heart valves.
Main features of balloon–expandable and self–expanding aortic transcatheter heart valves.
Lastly, the most common classification of THVs is based on the mechanism of the valve frame expansion (Figure 2) as self-expandable (SE), balloon-expandable (BE) or mechanically expandable. Detailed information on each THV are provided in Table 1.
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Figure 2. Transcatheter heart valves, stratified by mechanism of the valve frame expansion and leaflets position.
Transcatheter heart valves, stratified by mechanism of the valve frame expansion and leaflets position.
Table 1.
Overview of Transcatheter Aortic Valve Replacement (TAVR) Prostheses.
Prosthesis Frame Material Leaflet Material Valve Sizes (mm) Sheath Sizes Supra- or Intra-

Annular		 Repositionable/Retrievable Delivery Routes FDA Approval CE Mark Approval
Balloon-expandable                  
Sapien Stainless steel Bovine pericardium 23, 26 22F (23 mm), 24F (26 mm) Intra-annular No/No TF, TA ✓ ✓
Sapien XT Cobalt-chromium Bovine pericardium 23, 26, 29 16F (23 mm), 18F (26 mm), 20F (29 mm) Intra-annular No/No TF, TA, TAo ✓ ✓
Sapien 3 Cobalt-chromium Bovine pericardium 20, 23, 26, 29 14F (20, 23, 26 mm), 16F (29 mm) Intra-annular No/No TF, TA, TAo ✓ ✓
Sapien 3 Ultra Cobalt-chromium Bovine pericardium 20, 23, 26, 29 14F Intra-annular No/No TF ✓ ✓
Myval THV Nickel-cobalt Bovine pericardium 20, 23, 26, 29, 21.5, 24.5, 27.5, 30.5, 32 14F Intra-annular No/No TF   ✓
Self-expanding                  
CoreValve Nitinol Porcine pericardium 23, 26, 29, 31 18F Supra-annular Yes/Yes TF, TAo, SC ✓ ✓
Evolut R Nitinol Porcine pericardium 23, 26, 29, 34 14F (23, 26, 29 mm), 16F (34 mm) Supra-annular Yes/Yes TF, TAo, SC ✓ ✓
Evolut PRO Nitinol Porcine pericardium 23, 26, 29, 34 16F Supra-annular Yes/Yes TF, TAo, SC ✓ ✓
Evolut PRO+ Nitinol Porcine pericardium 23, 26, 29, 34 14F (23, 26, 29 mm), 16F (34 mm) Supra-annular Yes/Yes TF, TAo, SC ✓ ✓
ACURATE neo Nitinol Porcine pericardium 23, 25, 27 18F Supra-annular No/No TF, TA   ✓
ACURATE neo2 Nitinol Porcine pericardium 23, 25, 27 14F Supra-annular No/No TF, TA   ✓
Allegra Nitinol Bovine pericardium 23, 27, 31 18F Supra-annular Yes/Yes TF    
Hydra Nitinol Bovine pericardium 22, 26, 30 18F Supra-annular Yes/Yes TF   ✓
Engager Nitinol Bovine pericardium 23, 26 30F Supra-annular Yes/Yes TA   ✓
Venus-A valve Nitinol Porcine pericardium 23, 26, 29, 32   Supra-annular Yes/No TF    
VitaFlow Nitinol Bovine pericardium 21, 24, 27, 30 16F (21, 24 mm), 18F (27, 30 mm) Supra-annular Yes/No TF, TAo, CA    
VitaFlow Liberty Nitinol Bovine pericardium 21, 24, 27, 30 16F (21, 24 mm), 18F (27, 30 mm) Supra-annular Yes/No TF, TAo, CA    
Centera Nitinol Bovine pericardium 23, 26 29 14F Intra-annular Yes/Yes TF   ✓
Portico Nitinol Bovine pericardium 23, 25, 27, 29 18F (23, 25 mm), 19F (27, 29 mm) Intra-annular Yes/Yes TF, TAo, TAx, SC   ✓
Navitor Nitinol Bovine pericardium 23, 25, 27, 29 14F (23, 25 mm), 15F (27, 29 mm) Intra-annular Yes/Yes TF, TAo, TAx   ✓
Mechanically expandable                  
Lotus Nitinol Bovine pericardium 23, 25, 27 20F (23, 25 mm), 22F (27 mm) Intra-annular Yes/Yes TF, TAo ✓ ✓
Lotus Edge Nitinol Bovine pericardium 23, 25, 27 15F Intra-annular Yes/Yes TF, TAo ✓ ✓
Lotus Mantra Nitinol Bovine pericardium 23, 25, 27 12F Intra-annular Yes/Yes TF, TAo ✓ ✓
Aortic regurgitation                  
JenaValve Nitinol Porcine pericardium 23, 25, 27 19F Intra-annular Yes/Yes TA   ✓
J·Valve Nitinol Bovine pericardium 22, 25, 28 18F Intra-annular No/No TA   ✓
TF-Transfemoral, TA-Transapical, TAo-Transaortic, TAx-Transaxillary, SC-Subclavian, CA-Carotid. FDA Approval–approved for use by the United States Food and Drug Administration. CE Mark Approval–approved for use across all EU member states, European Econamic Area, and Turkey by the European Commission. ✓ = approved.

2.1. Balloon-Expandable Valves

The first implanted THV (Cribier-Edwards) [6], SAPIEN devices (Edwards Lifesciences), and the Myval THV (Meril Life Sciences, Gujarat, India) belong to the BE group. The expansion of these valves requires balloon inflation during rapid ventricular pacing, which may not be well tolerated by patients with reduced left ventricular ejection fraction (LVEF) or impaired renal function. All BE-THV are intra-annular, are not repositionable and have a lower stent frame profile, facilitating coronary access as compared with SE-THV. Furthermore, the delivery system allows for greater steerability than SE- or ME-THV, helping in valve implantation in patients with challenging vascular anatomy, such as in case of horizontal aorta, defined as an aortic angulation >60°. The SAPIEN 3 consists of a trileaflet bovine pericardial valve mounted in a cobalt-chromium frame with an outer seal cuff to reduce PVL; in the SAPIEN 3 Ultra, frame height was increased to further reduce the rate of PVL [17]. The SAPIEN 3 and SAPIEN 3 Ultra are FDA approved [18]. The Myval THV (Meril Life Sciences, Gujarat, India) obtained the CE mark in 2019 but is not yet FDA-approved; it consists of a nickel–cobalt alloy (MP35N) frame, a trileaflet valve of bovine pericardium tissue and an external polymeric sealing cuff [19,20][19][20].

2.2. Self-Expanding Valves

The group of SE-THV includes a wider range of devices from different companies. The majority of SE-THV are supra-annular, resulting in a higher EOA, lower gradients, and lower rate of severe prosthesis–patient mismatch (PPM). Rapid ventricular pacing during implantation is not mandatory and most SE-THV are repositionable and/or retrievable, at the expense of limited steerability. Of note, the greater frame height of SE-THV may make coronary access more challenging. The Medtronic Corevalve (Medtronic, Sunnyvale, CA, USA) was the first self-expanding THV developed, and together with its subsequent generations—Evolut R, Evolut PRO and Evolut PRO+—represents the most studied and commonly implanted SE-THV and has CE and FDA approval. The Evolut PRO+ added an outer porcine pericardial tissue wrap that increases surface area contact and tissue interaction between the THV and the native aortic annulus. Of note, the frame of Medtronic SE-THV, due to its higher radial force, exerts a higher pressure on the membranous septum and the conduction system than BE-THV, resulting in considerable risk of conduction abnormalities requiring PPI [21]. The ACURATE neo (older generation) [22] and ACURATE neo2 (newer generation) [23] produced by Boston Scientific, have similar characteristics to the Evolut THV, except for the fact that implant depth can be controlled due to its top-down deployment, it is non-repositionable, and that predilation of the aortic valve is strongly recommended. Other SE-THV with CE but not FDA approval include: Allegra (NVT AG), whose grip uses a “squeeze-to-release” mechanism, avoiding any rotation during the entire implantation, performed in a stepwise manner [24,25][24][25]; Hydra (Vascular Innovations Co., Ltd., Nonthaburi, Thailand) which includes a mechanism for recapturing during release [14]; Engager (Medtronic), and Venus-A valve (Venus Medtech, Hangzhou, China) [26]. VitaFlow (Microport, Shanghai, China) and its subsequent iteration VitaFlow Liberty™ are novel THVs manufactured in China, for which the CE approval is ongoing [27,28][27][28]. Among SE-THV, some are intra-annular, such as Centera (Edwards) [29], Portico (Abbott Structural Heart, Westfield, IN, USA) and its iteration Navitor (Abbott Structural Heart). The Portico valve (Abbott) is a self-expanding, fully resheathable and retrievable valve with leaflet geometry designed to function in both round and elliptical configurations. The annular positioning facilitates the engagement of coronary ostia after implantation [15,30][15][30]. This valve is CE- and FDA- (September 2021) approved. The Navitor THV has as a key innovation in an active outer fabric cuff designed to reduce the PVL. SE-THV with supra-annular designs are particularly indicated in patients with small or severely calcific annulus, TAVR-in-SAVR, and both supra- and intra-annular valves are indicated in patients at risk for poor tolerance to rapid pacing.

2.3. Mechanically-Expandable Valves

The expansion of mechanically expandable-THV is mediated by a mechanical controlled system and usually does not require rapid ventricular pacing. These valves are intra-annular, fully repositionable, and retrievable. This group included LOTUS (older generation), LOTUS Edge and LOTUS Mantra (newer generation, all produced by Boston Scientific, but currently recalled due to issues with the product delivery system) [31].

2.4. Valves with Active Fixation Mechanisms

In recent years, valves equipped with an active fixation mechanism were developed. The anchor mechanism enables fixation of the prosthesis onto the native valve leaflets, providing stability in the context of non-calcified native valves and allowing implantation in patients with aortic regurgitation. The JenaValve (JenaValve Technology, München, Germany), a porcine pericardial valve in a low-profile nitinol frame with a paperclip-like fixation mechanism, is currently the only THV with a CE mark for use in patients with aortic regurgitation [32]. The J-Valve (JC Medical) is another device that can be employed for the treatment of native AR, as well as AS, and is currently being evaluated in an early feasibility study in the US [33]. Two further valves from China, the Venus-AVR valve (Venus Medtech) and VitaFlowVR (Microport), are at an advanced stage of development with high rates of procedural success in the challenging cohort of patients with a bicuspid aortic valve [15,26][15][26].

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