In vitro evaluation of flow patterns and turbulent kinetic energy in trans-catheter aortic valve prostheses.
MAGMA
; 31(1): 165-172, 2018 Feb.
Article
em En
| MEDLINE
| ID: mdl-28921052
ABSTRACT
OBJECTIVES:
The objective of the current work was to evaluate flow and turbulent kinetic energy in different transcatheter aortic valve implants using highly undersampled time-resolved multi-point 3-directional phase-contrast measurements (4D Flow MRI) in an in vitro setup. MATERIALS ANDMETHODS:
A pulsatile flow setup was used with a compliant tubing mimicking a stiff left ventricular outflow tract and ascending aorta. Five different implants were measured using a highly undersampled multi-point 4D Flow MRI sequence. Velocities and turbulent kinetic energy values were analysed and compared.RESULTS:
Strong variations of turbulent kinetic energy distributions between the valves were observed. Maximum turbulent kinetic energy values ranged from 100 to over 500 J/m3 while through-plane velocities were similar between all valves.CONCLUSION:
Highly accelerated 4D Flow MRI for the measurement of velocities and turbulent kinetic energy values allowed for the assessment of hemodynamic parameters in five different implant models. The presented setup, measurement protocol and analysis methods provides an efficient approach to compare different valve implants and could aid future novel valve designs.Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Valva Aórtica
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Próteses Valvulares Cardíacas
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Imageamento por Ressonância Magnética
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Técnicas de Imagem Cardíaca
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Substituição da Valva Aórtica Transcateter
Tipo de estudo:
Evaluation_studies
Limite:
Humans
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article