Document Detail

Does the Ventrica magnetic vascular positioner (MVP) for coronary artery bypass grafting significantly alter local fluid dynamics? A numeric study.
MedLine Citation:
PMID:  17674340     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: Automatic devices have been recently introduced to make the anastomosis procedure quick and efficient when creating a coronary bypass on the beating heart. However, the implantation of these devices could modify the graft configuration, consistently affecting the hemodynamics usually found in the traditional anastomosis. As local fluid dynamics could play a significant role in the onset of vessel wall pathologies, in this article a computational approach was designed to investigate flow patterns in the presence of the Ventrica magnetic vascular positioner (Ventrica MVP) device. METHODS: A model of standard hand-sewn anastomosis and of automated magnetic anastomosis were constructed, and the finite volume method was used to simulate in silico realistic graft hemodynamics. Synthetic analytical descriptors -- i.e., time-averaged wall shear stress (TAWSS), oscillating shear index (OSI) and helical flow index (HFI) -- were calculated and compared for quantitative assessment of the anastomosis geometry hemodynamic performance. RESULTS: In this case study, the same most critical region was identified for the 2 models as the one with the lowest TAWSS and the highest OSI (TAWSS=0.229, OSI=0.255 for the hand-sewn anastomosis; TAWSS=0.297, OSI=0.171 for the Ventrica MVP(R)). However, the shape of the Ventrica MVP does not induce more critical wall shear stresses, oscillating flow and damped helicity in the graft fluid dynamics, as compared with conventional anastomosis. CONCLUSIONS: We found that the use of the Ventrica MVP for the case study under investigation was not associated with more critical fluid dynamics than with conventional hand-sewn anastomosis. Thereby, the device could facilitate beating heart and minimally invasive coronary artery bypass grafting without increasing local hemodynamic-related risks of failure.
U Morbiducci; M Lemma; R Ponzini; A Boi; L Bondavalli; C Antona; F M Montevecchi; A Redaelli
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The International journal of artificial organs     Volume:  30     ISSN:  0391-3988     ISO Abbreviation:  Int J Artif Organs     Publication Date:  2007 Jul 
Date Detail:
Created Date:  2007-08-03     Completed Date:  2007-12-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7802649     Medline TA:  Int J Artif Organs     Country:  Italy    
Other Details:
Languages:  eng     Pagination:  628-39     Citation Subset:  IM    
Department of Mechanics, Università Politecnica delle Marche, Ancona, Italy.
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MeSH Terms
Anastomosis, Surgical / instrumentation
Blood Flow Velocity
Computer Simulation
Coronary Artery Bypass / instrumentation*
Models, Cardiovascular*

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