Effective Orifice Area during Exercise in Bileaflet Mechanical Valve Prostheses

2017 ◽  
Vol 30 (4) ◽  
pp. 404-413 ◽  
Author(s):  
Philippe B. Bertrand ◽  
Matteo Pettinari ◽  
Hélène De Cannière ◽  
Herbert Gutermann ◽  
Christophe J.P. Smeets ◽  
...  
Keyword(s):  
Mechanical Valve ◽  
Effective Orifice Area ◽  
Orifice Area ◽  
Bileaflet Mechanical Valve ◽  
Valve Prostheses

scholarly journals Hemodynamic influence of design parameters of novel venous valve prostheses

2018 ◽  
Vol 4 (1) ◽  
pp. 149-151
Author(s):  
Michael Stiehm ◽  
Stefanie Kohse ◽  
Kerstin Schümann ◽  
Sebastian Kaule ◽  
Stefan Siewert ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Lower Limbs ◽  
Hydrodynamic Performance ◽  
Design Parameters ◽  
Effective Orifice Area ◽  
Valve Prosthesis ◽  
Venous Valve ◽  
Orifice Area ◽  
Valve Prostheses

AbstractVenous ulcers of the lower limbs are one clinical manifestation of chronic venous insufficiency. Currently, there is no venous valve prosthesis available. This study presents novel venous valve prostheses made of threedimensional electrospun fibrous nonwoven leaflets. The aim of this study was to prove the feasibility of the manufacturing process as well as to investigate design features of the venous valve prostheses from a hemodynamic point of view. An adapted pulse duplicator system (ViVitrolabs, Victoria, BC, CA) was used for characterization of the hydrodynamic performance. For eight different venous valve prototypes flow rate, effective orifice area and regurgitation fraction was investigated in vitro. In particular, tricusp valve designs showed an up to 40% higher effective orifice area as well as 15% higher maximum flowrate compared to bicusp valve designs. However, the regurgitation fraction of the bicusp valve designs is up to 86% lower compared to tricusp valve. Additionally, the hemodynamic performance of the tricuspid valves showed a high sensitivity regarding the leaflet length. Bicuspid valves are less sensitive to changes of design parameters, more sufficient and therefore highly reliable.

scholarly journals The Measurement of Opening Angle and Orifice Area of a Bileaflet Mechanical Valve Using Multidetector Computed Tomography

2009 ◽  
Vol 39 (4) ◽  
pp. 157 ◽  
Author(s):  
Dong-Hyeon Lee ◽  
Ho-Joong Youn ◽  
Sung-Bo Shim ◽  
Sun-Hee Lee ◽  
Jung-Im Jung ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Multidetector Computed Tomography ◽  
Mechanical Valve ◽  
Opening Angle ◽  
Orifice Area ◽  
Bileaflet Mechanical Valve

Comparison of continuity equation and Gorlin formula effective orifice area of aortic valve prostheses: an intraoperative study

2002 ◽  
Vol 19 (Supplement 27) ◽  
pp. 11 ◽  
Author(s):  
V. Rudolph ◽  
M. Hartrumpf ◽  
C. Schelenz ◽  
E. Hüttemann ◽  
J. M. Albes ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Continuity Equation ◽  
Effective Orifice Area ◽  
Orifice Area ◽  
Valve Prostheses

Effects of exercise on Doppler-derived pressure difference, valve resistance, and effective orifice area in different aortic valve prostheses of similar size

1999 ◽  
Vol 83 (4) ◽  
pp. 619-622 ◽  
Author(s):  
Maria J Eriksson ◽  
Stefan Rosfors ◽  
Kjell Rådegran ◽  
Lars-Åke Brodin
Keyword(s):  
Aortic Valve ◽  
Pressure Difference ◽  
Effective Orifice Area ◽  
Orifice Area ◽  
Valve Prostheses

scholarly journals Effective Orifice Area of Balloon-Expandable and Self-Expandable Transcatheter Aortic Valve Prostheses: An Echo Doppler Comparative Study

2021 ◽  
Vol 10 (2) ◽  
pp. 186
Author(s):  
Mohamad Kanso ◽  
Marion Kibler ◽  
Sebastien Hess ◽  
Jérome Rischner ◽  
Philoktimon Plastaras ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Heart Valves ◽  
Severe Aortic Stenosis ◽  
Published Data ◽  
Effective Orifice Area ◽  
Orifice Area ◽  
Transcatheter Aortic Valve ◽  
Valve Prostheses ◽  
Valve Implantation ◽  
New Generation

Published data on the size-specific effective orifice area (EOA) of transcatheter heart valves (THVs) remain scarce. Here, we sought to investigate the intra-individual changes in EOA and mean transvalvular aortic gradient (MG) of the Sapien 3 (S3), CoreValve (CV), and Evolut R (EVR) prostheses both at short-term and at 1-year follow-up. The study sample consisted of 260 consecutive patients with severe aortic stenosis who underwent transcatheter aortic valve implantation (TAVI). EOAs and MGs were measured with Doppler echocardiography for the following prostheses: S3 23 mm (n = 74; 28.5%), S3 26 mm (n = 67; 25.8%), S3 29 mm (n = 20; 7.7%), CV 23 mm (n = 2; 0.8%), CV 26 mm (n = 15; 5.8%), CV 29 mm (n = 24; 9.2%), CV 31 mm (n = 9; 3.5%), EVR 26 mm (n = 22; 8.5%), and EVR 29 mm (n = 27; 10.4%). Values were obtained at discharge, 1 month, 6 months, and 1 year from implantation. At discharge, EOAs were larger and MGs lower for larger-size prostheses, regardless of being balloon-expandable or self-expandable. In patients with small aortic annulus size, the hemodynamic performances of CV and EVR prostheses were superior to those of S3. However, we did not observe significant differences in terms of all-cause mortality according to THV type or size. Both balloon-expandable and self-expandable new-generation THVs show excellent hemodynamic performances without evidence of very early valve degeneration.

scholarly journals The Usefulness of [18F]F-Fluorodeoxyglucose and [18F]F-Sodium Fluoride Positron Emission Tomography Imaging in the Assessment of Early-Stage Aortic Valve Degeneration after Transcatheter Aortic Valve Implantation (TAVI)—Protocol Description and Preliminary Results

2021 ◽  
Vol 10 (3) ◽  
pp. 431
Author(s):  
Danuta Sorysz ◽  
Rafał Januszek ◽  
Anna Sowa-Staszczak ◽  
Anna Grochowska ◽  
Marta Opalińska ◽  
...  
Keyword(s):  
Aortic Valve ◽  
Emission Tomography ◽  
Effective Orifice Area ◽  
Orifice Area ◽  
Transcatheter Aortic Valve ◽  
Positron Emission ◽  
Pet Ct ◽  
Transvalvular Gradient ◽  
Valve Implantation

Transcatheter aortic valve implantation (TAVI) is now a well-established treatment for severe aortic stenosis. As the number of procedures and indications increase, the age of patients decreases. However, their durability and factors accelerating the process of degeneration are not well-known. The aim of the study was to verify the possibility of using [18F]F-sodium fluoride ([18F]F-NaF) and [18F]F-fluorodeoxyglucose ([18F]F-FDG) positron emission tomography/computed tomography (PET/CT) in assessing the intensity of TAVI valve degenerative processes. In 73 TAVI patients, transthoracic echocardiography (TTE) at initial (before TAVI), baseline (after TAVI), and during follow-up, as well as transesophageal echocardiography (TEE) and PET/CT, were performed using [18F]F-NaF and [18F]F-FDG at the six-month follow-up (FU) visit as a part of a two-year FU period. The morphology of TAVI valve leaflets were assessed in TEE, transvalvular gradients and effective orifice area (EOA) in TTE. Calcium scores and PET tracer activity were counted. We assessed the relationship between [18F]F-NaF and [18F]F-FDG PET/CT uptake at the 6 = month FU with selected indices e.g.,: transvalvular gradient, valve type, EOA and insufficiency grade at following time points after the TAVI procedure. We present the preliminary PET/CT ([18F]F-NaF, [18F]F-FDG) results at the six-month follow-up period as are part of an ongoing study, which will last two years FU. We enrolled 73 TAVI patients with the mean age of 82.49 ± 7.11 years. A significant decrease in transvalvular gradient and increase of effective orifice area and left ventricle ejection fraction were observed. At six months, FU valve thrombosis was diagnosed in four patients, while 7.6% of patients refused planned controls due to the COVID-19 pandemic. We noticed significant correlations between valve types, EOA and transaortic valve gradients, as well as [18F]F-NaF and [18F]F-FDG uptake in PET/CT. PET/CT imaging with the use of [18F]F-FDG and [18F]F-NaF is intended to be feasible, and it practically allows the standardized uptake value (SUV) to differentiate the area containing the TAVI leaflets from the SUV directly adjacent to the ring calcifications and the calcified native leaflets. This could become the seed for future detection and evaluation capabilities regarding the progression of even early degenerative lesions to the TAVI valve, expressed as local leaflet inflammation and microcalcifications.

Validity of identifying patient-prosthesis mismatch from the indexed effective orifice area

2008 ◽  
Vol 11 (3) ◽  
pp. 163-164 ◽  
Author(s):  
Yoshimasa Sakamoto ◽  
Kazuhiro Hashimoto ◽  
Hiroshi Okuyama ◽  
Shinichi Ishii ◽  
Noriyasu Kawada ◽  
...  
Keyword(s):  
Effective Orifice Area ◽  
Orifice Area ◽  
Patient Prosthesis Mismatch

Risk of warfarin during pregnancy with mechanical valve prostheses

2002 ◽  
Vol 100 (5) ◽  
pp. 1040-1041
Author(s):  
A REGENSTEIN
Keyword(s):  
Mechanical Valve ◽  
Valve Prostheses
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