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Open Access 22-11-2016 | Original Article

Transcatheter closure of paravalvular leaks: state of the art

Auteurs: I. Cruz-Gonzalez, J. C. Rama-Merchan, J. Rodríguez-Collado, J. Martín-Moreiras, A. Diego-Nieto, M. Barreiro-Pérez, P. L Sánchez

Gepubliceerd in: Netherlands Heart Journal | Uitgave 2/2017

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Abstract

Paravalvular leak (PVL) is a serious complication after surgical valve replacement or after transcatheter aortic valve replacement. Approximately 1–5% of PVLs can lead to serious clinical consequences, including congestive heart failure and/or haemolytic anaemia. For years, surgical re-intervention has been considered the treatment of choice for symptomatic patients with PVLs. However, surgical re-intervention is associated with a high risk of morbidity and mortality. Transcatheter PVL (TPVL) closure is a less invasive alternative to surgical re-intervention. The safety and feasibility of TPVL closure has been confirmed in several registries and a meta-analysis.
In this review, we discuss the clinical implications and diagnosis of PVLs, technical considerations for TPVL, execution of the procedure and assessment of the results.
Opmerkingen
I. Cruz-Gonzalez and J.C. Rama-Merchan contributed equally and should be considered as first authors.

Introduction

Paravalvular leak (PVL) is a serious complication after surgical valve replacement or after transcatheter aortic valve replacement (TAVR) [1, 2]. The incidence of PVLs after surgical valve replacement varies in different studies, ranging from 2–10% in the aortic position and from 7–17% in the mitral position [1, 3, 4]. Significant (moderate or severe) paravalvular regurgitation has been reported in up to one-quarter of patients following TAVR [5].
Although most PVLs are small, remain asymptomatic and follow a benign clinical course, larger PVLs with serious clinical consequences, such as heart failure, severe haemolytic anaemia or endocarditis, occur in 1–5% of patients who have undergone surgical valve replacement, with most occurring in association with prosthetic mitral valves [3, 4, 6, 7].
For years, surgical re-intervention has been considered the treatment of choice for symptomatic patients with PVLs. It was shown that the overall mortality was lower in the surgical re-intervention group compared with the group treated conservatively [4]. However, the operative mortality of surgical treatment of PVL is still high. Long-term outcomes remain suboptimal in these challenging patients, especially in the presence of multiple previous surgical re-interventions and associated co-pathologies [8]. Transcatheter PVL (TPVL) closure has emerged as a safe, effective and less invasive alternative to surgical re-intervention [912] with durable symptom relief in selected patients [10].
In this review, we discuss the clinical implications and diagnosis of PVLs, technical considerations for TPVL, execution of the procedure and assessment of results.

Diagnosis of paravalvular leak

In some cases, PVL diagnosis can be challenging. Often the first signs of suspicion are the presence of an abnormal murmur in the physical examination and the evidence of significant haemolytic anaemia in blood tests. Blood cultures to eliminate endocarditis should be considered. In cases of suspected PVL, patient evaluation must be followed by an echocardiography study to confirm the diagnosis. Two-dimensional (2D) transoesophageal echocardiography (TEE) is very sensitive in accurately identifying the presence of PVL [13]; however, in many cases, assessing the number, shape and location of the defects with 2D-TEE is practically impossible [14]. Three-dimensional (3D)-TEE allows better definition of the PVLs, making this technique the gold standard for PVL evaluation (Fig. 1). 3D-TEE is especially useful for mitral PVLs, being almost mandatory for a correct diagnosis [1517]. It is recommended that mitral PVL location be reported in a clockwise format from a surgeon’s perspective or ‘surgical view’ (Fig. 1; [15, 16, 18]). Also, the aortic PVL location should be reported in a clockwise format [9]. TEE is crucial during the TPVL closure procedure, while 3D-TEE plays an essential role in the selection of the closure device, for guiding the procedure, and assessment of the results (Fig. 2; [15, 16]). Furthermore, fusion imaging techniques provide a valuable extra help during the procedure, i. e. EchoNavigator automatically fuses live 3D-TEE and live X‑ray in real time, so it can intuitively guide the procedure in the 3D space.
Due to the complexity of some defects, other image modalities such as computed tomography (CT) and cardiac magnetic resonance (CMR) could be very useful [16, 19]. Recently introduced tools such as the 3D-Heart Navigator, which combine 3D-CT images with an overlay of the live X‑ray fluoroscopy information, can also assist during the procedure.

Transcatheter techniques for TPVL closure

Crossing the PVL

Mitral TPVL closure: In the antegrade approach (Fig. 3), once a successful transseptal puncture is made, a diagnostic catheter (e. g., Judkins right) is advanced into the left atrium. After that, a hydrophilic guidewire (e. g., Terumo guidewire, Terumo Medical Corporation) is often used to cross the mitral PVL and in most cases an arteriovenous loop is established in the aorta, alternatively an extra-support wire can be placed in the left ventricle. Finally, a delivery sheath is advanced from the venous access over the loop or extra-support wire and the device is deployed. Before releasing, the disc movement in mechanical valves should be confirmed. It can be very helpful to use a safety guidewire to avoid having to re-cross the PVL. Sometimes (e. g. in septal PVL or if the angle between the transseptal puncture and the defect is unfavourable) it can also be very helpful to use a deflectable catheter (e. g., Agilis, St Jude Medical), (Fig. 3; [11]).
In the retrograde approach, a hydrophilic guidewire (e. g., Terumo guidewire, Terumo Medical Corporation) over a catheter (e. g., Judkins right) is often used to cross the PVL from the left ventricle to the left atrium. After crossing, an arteriovenous wire loop is often created in the left atrium; therefore, a transseptal puncture is needed. Finally, the delivery sheath is advanced from the venous access and the device is deployed (Fig. 3).
Transapical access can be a good alternative for mitral PVL closure (especially for posterior or septal defects or patients with mitro-aortic mechanical valves) [9]. The main advantages of this access are the often less difficult wiring of the PVL and less resistance to cross the PVL.
Aortic PVL closure: The retrograde approach is used for closure of most aortic PVLs (Fig. 3). The defect is usually crossed using a hydrophilic guidewire over a catheter (e. g. Amplatzer Left-1). After crossing, this guidewire is exchanged for a stiffer wire (e. g., Amplatz Super-stiffTM, Boston Scientific). Finally, the delivery sheath is advanced and the device is deployed. In some cases an arterio-arterial loop can be established for added support. The technique for PVL closure after TAVR is similar to the technique for aortic PVLs after surgical valve replacement [20].

Choosing the sheath

There are different sheaths that can be used for delivering the device. The size of the leak dictates the device, which dictates the sheath/guide used for delivery (Table 1). In most of the cases the Amplatzer TorqVue (St Jude Medical, St. Paul, MN, USA) sheaths are used. If there is difficulty in crossing the leak, other options such as the Terumo Destination Guiding Sheath (Terumo, Japan) or the Sheathless Eucath (Ashahi Intec, Japan) should be considered as they provide a larger lumen with smaller outer diameter. It should be taken into account that the largest Occlutech Paravalvular Leak Devices (PLD, Occlutech, Helsingborg, Sweden) need a 10 F sheath. In certain cases, where TPVL closure cannot be completely achieved with a single device, multiple devices can be deployed using simultaneous sheaths or sequentially using different techniques [21].
Table 1
Amplatzer and Occlutech devices: main characteristics
Amplatzer devices
 
Size
(central waist)
Length
(central waist)
Difference between disc and central waist
Sheath size (Fr)
ASO
4–40 mm
(every 1 mm up to 20 mm, >20 mm, every 2 mm)
3–4 mm
8–12 mm (ASO 4–10)
10/14 mm (ASO >11)
10/16 mm (ASO >34)
6–12
AmVSDO
4–18 mm
(every 2 mm)
7 mm
8 mm
5–9
ADO
5–16 mm distal end and 4–14 mm proximal
5–8 mm
4 mm (ADO 5/4–8/6)
6 mm (ADO 10/8–16/14)
5–7
AVP II
3–22 mm (every 2 mm)
6 mm
4–7
AVP III
Long axis: 4–14 mm
Short axis: 2–5 mm
2–5 mm
2 mm
4–7
AVP IV
4–8 mm
10–13.5 mm
4–5
Occlutech devices
 
Length of the distal disc
Length of the proximal disc
Length × Width
Size (Fr)
Occlutech PLD Rectangular Wa
4 W
6 W
8 W
10 W
12 W
14 W
16 W
18 W
11.5
14
16.5
19
21
24
26.5
28.5
10
12.5
15
17
19
22
24.5
26.5
4 × 2
6 × 3
8 × 4
10 × 4
12 × 5
14 × 6
16 × 8
18 × 10
6
6
7
8
9
9
10
10
Occlutech PLD Rectangular Tb
5 T
7 T
10 T
12 T
13
16
19
21
11.5
14
17
19
6
7
8
9
Occlutech PLD Square Wa
4 W
5 W
6 W
7 W
13
14
16
17
11.5
12.5
14
16
4 × 4
5 × 5
6 × 6
7 × 7
6
6
6
7
Occlutech PLD Square Tb
3 T
5 T
7 T
11.5
14
17
10
12.5
16
6
6
7
ASO Amplatzer Septal Occluder, AmVSDo Amplatzer Muscular VSD Occluder, ADO Amplatzer Duct Occluder, AVP Amplatzer Vascular Plug, PVL paravalvular leak
aW (Waist)
bT (Twist)

Choosing the device

Most of the devices used today have not been designed, tested, or approved for PVL closure and they are used ‘off-label’ for this purpose (Fig. 4). PVLs are variable in size and shape with many being crescentic and serpiginous, rather than cylindrical, which makes it extremely difficult for one device to fit in all PVLs. Amplatzer devices (St. Jude Medical, St. Paul, MN, USA) are currently the most used for TPVL closure [9, 11, 2224]. The Amplatzer Vascular Plug (AVP) II is widely used in the USA while in Europe the most frequently used device is the AVP III. At this time, the only device specifically approved to TPVL closure by the European Commission is the Occlutech PLD [25].
For a small cylindrical PVL, we will often use an AVP II or PDA occluder. For an oval PVL, an AVP III occluder is preferred. For a small PVL with significant angulation and a small neck (typically after TAVR), an AVP IV occluder can be considered. Sizing of these devices usually comes from 2D- and 3D-TEE measurements. Angiography can also be useful for aortic PVL. The PLD rectangular-shaped device is also recommended to cover crescent-shaped defects while avoiding interference with the valve.

Outcomes and complications of PVL closure procedures

The safety and feasibility of TPVL closure has been confirmed in several registries and a meta-analysis [9, 10, 12, 23, 26]. Reported technical and clinical success ranged from 77–86% and 67–77% respectively (Table 2; [9, 10, 12, 23, 26, 27]). Also, successful TPVL closure has been associated with a lower cardiac mortality rate compared with failed closure (260 patients; OR 0.08; 95% CI 0.01–0.90), a positive tendency toward lower all-cause mortality (311 patients; OR 0.52; 95% CI, 0.09–1.74) and a superior functional class improvement or improved haemolytic anaemia compared with failed TPVL closure (267 patients; OR 9.95; 95% CI, 2.10–66.73). Complication rates are low at experienced centres (Table 3; [9, 10, 22, 23, 28, 29]). It has recently been shown in a single-centre non-randomised study that percutaneous PVL closure results compare favourably with surgical treatment [30]. Furthermore, in 308 PVL closure procedures attempted in 259 patients in 20 centres Calvert et al. [29] reported a technical success rate of 91%, PVL improved post-procedure (p < 0.001) and was none (33.3%), mild (41.4%), moderate (18.6%) or severe (6.7%) at last follow-up. The mean New York Heart Association class improved from 2.7 ± 0.8 pre-procedure to 1.6 ± 0.8 (p < 0.001) after a median follow-up of 110 (7–452) days.
Table 2
Summary of main PVL closure studies
 
Hein [28]
Cortés [26]
Ruiz [9]
Sorajja [11]
Noble [27]
Cruz [23]
Sánchez [22]
Calvert [29]
Patients, n
21
27
43
126
56
33
20
259
Mean age, years
65
63
69
67
65
71
68
67
Male, %
62
81
67
53
52
45
60
28
Indication
CHF, %
Haemolysis, %
Both, %
38
10
52
33
11
56
16
14
60
71
7
22
61
9
30
21
3
76
55
5
40
80
16
2
Prosthesis
Mechanical, n
Bioprosthesis, n
27
0
15
28
49
77
50
6
32
1
15
5
57
38
Patients with
Mitral PVL
Aortic PVL
13
8
27
0
33
10
99
27
44
12
26
7
14
6
44
48
Approach
Anterograde
Retrograde
Both
17
100
32
13
44
12
0
7
26
0
104
173
17
Device implanted
AVP III, n
AVP II, n
ADO, n
mVSD, n
ASO, n
OPLD, n
0
0
8
13
5
0
0
17
0
0
0
5
39
11
2
0
77
20
10
12
7
0
18
28
0
34
0
0
0
0
18
2
0
0
1
184
9
12
41
20
11
Technical success, %
95
62
86
91
75
94
85
91
Procedural success, %
90
37
81
76
71
91
80
NYHA improved from 2.7 ± 0.8 pre-procedure to 1.6 ± 0.8
Mean follow-up, months
13.5
3
42
11 (median)
30 (median)
3
12 (median)
3.7 (median)
PVL paravalvular leak, CHF chronic heart failure, AVP Amplatzer vascular plug, ADO Amplatzer duct occluder, mVSD Amplatzer muscular ventricular septal defect occluder, ASO Amplatzer septal occluder, OPLD Occlutech® Paravalvular Leak Device, NYHA New York Heart Association
Table 3
Main complications associated with PVL closure
Complication
Percentage
Device embolisation
4% [9]
Cardiac perforation
4%a [9], 0% [23], 0% [11]
Death
2% [9], 1,7% [11]
Vascular complications
2% [9], 0,9% [11]
Embolic stroke
1.7% [11]
Emergency cardiac surgery for prosthetic impingement
0.9% [11]
Intracranial haemorrhage
0.9% [11]
Sepsis
0.9% [11]
aTransapical access
On the other hand, experience with TPVL closure after TAVR is still limited, but it could be a reasonable strategy in selected patients [2]. TPVL closure after TAVR is associated with high success rates and with an improved functional status [2]. The most used devices are the AVP II, III and IV [2].

Medical therapy and follow-up

For patients under anticoagulation therapy this should be continued after the procedure. Dual antiplatelet therapy for at least 3 months is recommended in non-anticoagulated patients (i. e. biological prostheses). Post-procedural imaging with TEE to assess device position and residual regurgitation is recommended. The timing of a follow-up TEE varies between institutions but we recommend an initial early TEE 3 months after procedure.

Conclusions and future directions

TPVL closure in symptomatic patients with severe PVL is a less invasive option than surgical re-intervention, with lower procedural morbidity and mortality. However, surgical re-intervention is still a valuable option for large defects or cases that cannot be treated percutaneously. To continue to improve procedural success and outcomes, new advancements in device designs are necessary. The ideal PVL closure device should meet the following criteria: (a) should conform to the often ‘irregular’ defects, (b) have low-profile deliverability, (c) be repositionable and retrievable, (d) avoid interference with prosthetic valve leaflets, (e) accomplish complete closure of the defect, (f) have a low risk of embolisation or dislodgement and (g) should not be thrombogenic. In the same way recently introduced imaging tools such as the 3D-Heart Navigator or the Echo Navigator will improve the results of this complex intervention.

Conflict of interest

Dr. Cruz-Gonzalez is proctor for St Jude Medical.
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://​creativecommons.​org/​licenses/​by/​4.​0/​), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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Metagegevens
Titel
Transcatheter closure of paravalvular leaks: state of the art
Auteurs
I. Cruz-Gonzalez
J. C. Rama-Merchan
J. Rodríguez-Collado
J. Martín-Moreiras
A. Diego-Nieto
M. Barreiro-Pérez
P. L Sánchez
Publicatiedatum
22-11-2016
Uitgeverij
Bohn Stafleu van Loghum
Gepubliceerd in
Netherlands Heart Journal / Uitgave 2/2017
Print ISSN: 1568-5888
Elektronisch ISSN: 1876-6250
DOI
https://doi.org/10.1007/s12471-016-0918-3

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