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research-article

Influence of a commercial antithrombotic filter on the caval blood flow during neutra and Valsalva manoeuvre

[+] Author and Article Information
M. Nicolas

Aragón Institute of Engineering Research (I3A). Universidad de Zaragoza. C/María de Luna s/n, E-50018 Zaragoza, Spain
marina.nicolaschueca@gmail.com

B. Lucea

Aragón Institute of Engineering Research (I3A). Universidad de Zaragoza. C/María de Luna s/n, E-50018 Zaragoza, Spain
blucea@gmail.com

A. Laborda

Grupo de Investigaci ón Técnicas de Mínima Invasi ón (GITMI), Faculty of Veterinary, Universidad de Zaragoza, C/Miguel Servet 177, E-50013 Zaragoza, Spain
alaborda@unizar.es

E. Peña

Aragón Institute of Engineering Research (I3A). Universidad de Zaragoza. C/María de Luna s/n, E-50018 Zaragoza, SpainCentro de Investigaci ón Biomédica en Red en Bioingeniería Biomateriales y Nanomedicina (CIBER-BBN)
fany@unizar.es

M. A. De Gregorio

Grupo de Investigaci ón Técnicas de Mínima Invasi ón (GITMI), Faculty of Veterinary, Universidad de Zaragoza, C/Miguel Servet 177, E-50013 Zaragoza, Spain
mgregori@unizar.es

M. A. Martínez

Aragón Institute of Engineering Research (I3A). Universidad de Zaragoza. C/María de Luna s/n, E-50018 Zaragoza, SpainCentro de Investigaci ón Biomédica en Red en Bioingeniería Biomateriales y Nanomedicina (CIBER-BBN)
miguelam@unizar.es

M. Malvè

Department of Mechanical Engineering, Energetics and Materials, Public University of Navarra, Campus Arrosadía, E-36001, PamplonaAragón Institute of Engineering Research (I3A). Universidad de Zaragoza. C/María de Luna s/n, E-50018 Zaragoza, SpainCentro de Investigaci ón Biomédica en Red en Bioingeniería Biomateriales y Nanomedicina (CIBER-BBN)
mauro.malve@unavarra.es

1Corresponding author.

ASME doi:10.1115/1.4035983 History: Received February 16, 2016; Revised December 19, 2016

Abstract

Anticoagulants are the treatment of choice for pulmonary embolism. When these fail or are contraindicated, vena cava filters are effective devices for preventing clots from the legs from migrating to the lung. Many uncertainties exist when a filter is inserted, especially during physiological activity such as normal breathing and the Valsalva manoeuvre. These activities are often connected with filter migration and vena cava damage due to the various related vein geometrical configurations. In this work we analysed the response of the vena cava during normal breathing and Valsalva manoeuvre, for a healthy vena cava and after insertion of a commercial Günther-Tulip filter. Computational fluid dynamics (CFD) and patient specific data are used for analysing blood flow inside the vena cava during these manoeuvres. While during normal breathing the vena cava flow can be considered almost stationary with a very low pressure gradient, during Valsalva the extravascular pressure compresses the vena cava resulting in a drastic reduction of the vein section, a global flow decrease through the cava but increasing the velocity magnitude. This change in section is altered by the presence of the filter which forces the section of the vena cava before the renal veins to keep open. The effect of the presence of the filter is investigated during these manoeuvres showing changes in wall shear stress and velocity patterns.

Copyright (c) 2017 by ASME
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