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Acute and Chronic Swine Rete Arteriovenous Malformation Models: Hemodynamics and Vascular Remodeling
A. K. Wakhlooa, B. B. Liebera, R. Siekmannc, D. J. Ebera and M. J. Gounisa; American Journal of Neuroradiology: 26; 1702-1706.
Liquid embolic agents are increasingly gaining importance in the embolization of cerebral arteriovenous malformations (AVMs). Currently, the most commonly used agent is N-butyl 2-cyanoacrylate (NBCA). Various NBCA mixtures, arterial hypotension, and Valsalva maneuver (increased positive end-expiratory pressure) during the injection of the acrylate have been used to address hemodynamic and architectural variations of an AVM; however, the precise in vivo polymerization, distribution, and kinetics of NBCA mixtures are unknown. We investigated the effect of different acrylate/Lipiodol mixtures and the addition of glacial acetic acid (GAA) on the penetration, dispersion, and injection force of NBCA.
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Visit SourceC. C. M. Rindt, A. A. van Steenhoven, J. D. Janssen a and G. Vossers; Journal of Fluid Mechanics: 226; 445-474; 1991.
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Visit SourceMano J. Thubrikar, PhD, Francis Robicsek, MD, Brett L. Fowler, BS; The Journal of Thoracic and Cardiovascular Surgery: 107; 707-716; 1994.
Saphenous vein graft stenosis has become the leading cause of reoperation in coronary bypass operations. We investigated the role of vein valves in vein graft stenosis by studying 14 human saphenous veins placed in a simulator of the left side of the heart in parallel with the arterial system.
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Visit SourceSheng-Jing Dong, Paul S. Hees, Wen-Mei Huang, Sam A. Buffer Jr., James L. Weiss, and Edward P. Shapiro; American Journal of Physiology: 277; 1999.
Shortening of oblique left ventricular (LV) fibers results in torsion. A unique relationship between volume and torsion is therefore expected, and the effects of load and contractility on torsion should be predictable. However, volume-independent behavior of torsion has been observed, and the effects of load on this deformation remain controversial....
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Visit SourceEdmond Rambod, Masoud Beizaie, Michael Shusser, Simcha Milo and Morteza Gharib; Annals of Biomedical Engineering: 27, Issue 6; 774-792; 1999.
This study was aimed at developing a physical model, supported by experimental observations, to describe the formation and growth of microbubbles seen in patients with mitral mechanical heart valves (MHV). This phenomenon, often referred to as high intensity transient signals (HITS), appears as bright, intense, high-velocity and persistent echoes detected by Doppler ultrasonography at the instant of closure.
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Visit SourceNatascha Simon-Kupilik, MDa, Heinz Schima, PhDb, Leopold Huber, MEb, Reinhard Moidl, MDa, Gerhard Wipplingerb, Udo Losert, MDc, Ernst Wolner, MDa, Paul Simon, MD; The Annals of Thoracic Surgery: 73; 455-459; 2002.
Aortic root replacement for prosthetic aortic valve endocarditis with accompanying destruction of the aortic root is a well-established surgical intervention. However, there is still no consensus whether prosthetic material or allogeneic material should be used. Here we report on our experience with prosthetic composite and aortic allograft root replacement in such patients during a 10-year interval.
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Visit SourceJulia Mascherbauera, Heinrich Schimab, Raphael Rosenheka, Martin Czernyc, Gerald Maurera and Helmut Baumgartnera; European Heart Journal: 25, Issue 9; 787-793; 2004.
The calculation of valve resistance (R) rather than aortic valve area (AVA) has been proposed for the assessment of aortic stenosis (AS), based on the claim that it is less flow-dependent. Even more importantly, valve resistance has been reported to distinguish between truly severe and "pseudosevere" AS in patients with low cardiac output. However, the diagnostic value of valve resistance remains controversial.
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Visit SourceTravis BR, Fowler BL, Robicsek F.; J Heart Valve Dis. (5):499-506; Sep 18, 2009.
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Visit SourceA Beaulieu, E Foucault, P Braud… - … (MeMeA), 2011 IEEE …, 2011 - ieeexplore.ieee.org
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Visit SourceJ Calderan, E Sirois, W Sun - … Conference (NEBEC), 2012 38th …, 2012 - ieeexplore.ieee.org
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Visit SourceNiema M. Pahlevana, Morteza Ghariba, - Journal of Biomechanics Volume 46, Issue 13, 3 September 2013, Pages 2122–2129
An impedance pump – also known as Liebau pump – is a simple valveless pump that operates based on the principles of wave propagation and reflection. It has been shown in embryonic zebrafish that a similar mechanism is responsible for the pumping action in the embryonic heart during the early stages before valve formation...
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Visit SourceA Siewnicka, K Janiszowski, M Gawlikowski – Mechatronics 2013, 2014 – Springer
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Visit SourceNM Pahlevan, M Gharib – PLOS ONE, 2014
… doi:10.1371/journal.pone.0087122.g001. The left ventricle was simulated by a piston-in-cylinder pump (ViVitro Labs Inc. … The signals were collected using the Tri-pack pressure measuring systems (TP8891, Vivitro Labs Inc.).
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Visit SourceNM Pahlevan, M Gharib – Journal of Biomechanics, 2014
A piston-in-cylinder pump (ViVitro Labs Inc. SuperPump System: Model … DPT-400). Tri-pack pressure measuring systems TP8891 (Vivitro Labs Inc.) consisting of three bridge amplifiers were used to collect the signals. Volume …
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