scholarly journals Transcatheter aortic valve thrombosis: a review of potential mechanisms

2021 ◽  
Vol 18 (184) ◽  
Author(s):  
Vrishank Raghav ◽  
Prem Midha ◽  
Rahul Sharma ◽  
Vasilis Babaliaros ◽  
Ajit Yoganathan
Keyword(s):  
Blood Flow ◽  
Aortic Valve ◽  
Relevant Literature ◽  
Endothelial Damage ◽  
Blood Biochemistry ◽  
Transcatheter Aortic Valve ◽  
Valve Thrombosis ◽  
Flow Mechanisms ◽  
Primary Focus ◽  
Foreign Materials

Transcatheter aortic valve (TAV) thrombosis has been recognized as a significant problem that sometimes occurs as early as within 30 days after valve implantation, leading to increased concerns of stroke and long-term valve durability. In this article, a critical summary of the relevant literature on identifying potential mechanisms of TAV thrombosis from the perspective of the well-known Virchow's triad, which comprises blood flow, foreign materials and blood biochemistry, is presented. Blood flow mechanisms have been the primary focus thus far, with a general consensus on the flow mechanisms with respect to haemodynamic conditions, the influence of TAV placement and expansion and the influence of coronary flow. Less attention has been paid to the influence of blood biochemistry and foreign materials (and related endothelial damage), with little consensus among studies with regards to platelet and/or microparticle levels post-TAV implantation. Finally, we discuss the future outlook for research with unanswered scientific questions.

scholarly journals The ACURATE neo2 valve system for transcatheter aortic valve implantation: 30-day and 1-year outcomes

2021 ◽  
Author(s):  
Helge Möllmann ◽  
David M. Holzhey ◽  
Michael Hilker ◽  
Stefan Toggweiler ◽  
Ulrich Schäfer ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Transcatheter Aortic Valve Implantation ◽  
Pacemaker Implantation ◽  
Paravalvular Leak ◽  
Transcatheter Aortic Valve ◽  
All Cause Mortality ◽  
Valve Thrombosis ◽  
Aortic Valve Implantation ◽  
And Performance ◽  
Valve Implantation

Abstract Background Transcatheter aortic valve implantation (TAVI) has become standard treatment for elderly patients with symptomatic severe aortic valve stenosis. The ACURATE neo AS study evaluates 30-day and 1-year clinical and hemodynamic outcomes in patients treated with the ACURATE neo2 valve. Methods The primary endpoint of this single-arm multicenter study is 30-day all-cause mortality. Other key endpoints include device performance, echocardiographic measures assessed by an independent core laboratory, and VARC-2 clinical efficacy and safety endpoints through 12 months. Results The study enrolled 120 patients (mean age 82.1 ± 4.0 years; 67.5% female, mean baseline STS score 4.8 ± 3.8%). The VARC-2 composite safety endpoint at 30 days occurred in 13.3% of patients. All-cause mortality was 3.3% at 30 days and 11.9% at 1 year. The 30-day stroke rate was 2.5% (disabling stroke 1.7%); there were no new strokes between 30 days and 12 months. The rate of permanent pacemaker implantation was 15.0% (18/120) at 30 days and 17.8% (21/120) at 1 year. No patients required re-intervention for valve-related dysfunction and there were no cases of valve thrombosis or endocarditis. Patients demonstrated significant improvement in mean aortic valve gradient (baseline 38.9 ± 13.1 mmHg, 1 year 7.8 ± 3.5 mmHg; P < 0.001 in a paired analysis). In the overall population, paravalvular leak was evaluated at 1 year as none/trace in 60.5%, mild in 37.0%, and moderate in 2.5%; no patients had severe PVL. Conclusions One-year outcomes from the ACURATE neo AS study support the safety and performance of TAVI with the ACURATE neo2 valve. Graphic Abstract

scholarly journals Coagulation derangement and risk factors for valve thrombosis following transcatheter aortic valve implantation

Open Heart ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. e001496
Author(s):  
Tiffany Patterson ◽  
Harriet Hurrell ◽  
Jack Lee ◽  
Giulia Esposito ◽  
Utkarsh Dutta ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Reference Range ◽  
Multivariable Analysis ◽  
Single Centre ◽  
Transcatheter Aortic Valve ◽  
Coagulation Testing ◽  
Valve Thrombosis ◽  
Valve Implantation ◽  
Transfemoral Tavi

AimsDurability of transcatheter aortic valve implantation (TAVI) is key to its expansion. We sought to identify incidence of valve thrombosis and predictors of valve thrombosis in our single centre with associated coagulation testing pre-TAVI and post-TAVI.Methods and resultsThis single-centre observational study comprised patients undergoing transfemoral TAVI discussed in the Heart Team meeting . Patients were followed up with echocardiography at 120 days to identify incidence of elevated transvalvular gradient and multivariable analysis was performed to identify factors associated with an increased odds of developing valve thrombosis. In addition, 11 patients underwent baseline, day 1 and day 120 post-TAVI coagulation testing. Between August 2017 and August 2019, 437 consecutive patients underwent transfemoral TAVI. Of these patients, 207/437 (47.4%) had 3-month follow-up echo data available and were analysed. Of these patients, 26/207 (12.6%) had elevated transvalvular gradients. These patients tended to be younger (80±14 vs 83±6 years; p=0.047) with a lower ejection fraction (49±13 vs 54%±11%; p=0.021), with a greater proportion of the population experiencing atrial fibrillation (14/21, 54% vs 68/181, 38%; p=0.067). Following multivariable analysis, there remained a trend towards higher eccentricity index associated with elevated gradients. Baseline (pre-TAVI) elevation of thrombin antithrombin levels (56±63; reference range 1.0–4.1 ng/L) and PF 1+2 (791±632; reference range 69–229 ng/mL) normalised at 120 days post-TAVIConclusionThis study demonstrated that in the cohort of patients undergoing transfemoral TAVI in our centre: younger age, poor ejection fraction, atrial fibrillation and increased baseline eccentricity of the aortic valve annulus were present to a greater extent in patients exhibiting elevated transvalvular gradients at 3-month follow-up. Further work is required to delineate the extent of coagulation derangement and confirm predictors of thrombosis.

scholarly journals Pathologic confirmation of valve thrombosis detected by four-dimensional computed tomography following valve-in-valve transcatheter aortic valve replacement

2017 ◽  
Vol 2017 (2) ◽  
Author(s):  
Ambarish Gopal ◽  
Nathalia Ribeiro ◽  
John J Squiers ◽  
Elizabeth M Holper ◽  
Michael Black ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Aortic Valve ◽  
Aortic Valve Replacement ◽  
Valve Replacement ◽  
Transcatheter Aortic Valve Replacement ◽  
Thrombus Formation ◽  
Imaging Modality ◽  
4D Ct ◽  
Transcatheter Aortic Valve ◽  
Valve Thrombosis

A major concern regarding transcatheter aortic valve replacement (TAVR) is leaflet thrombosis. Four-dimensional computed tomography (4D-CT) is the preferred imaging modality to evaluate patients with suspected valve thrombosis. To date, the abnormal findings visualized by 4D-CT suggestive of leaflet thrombosis have lacked pathologic confirmation from a surgically explanted valve in a surviving patient. Herein, we provide pathologic confirmation of thrombus formation following surgical explantation of a thrombosed TAVR prosthesis that was initially identified by 4D-CT. 

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