Document Detail


Trileaflet valve hydrodynamic resistance assessment.
MedLine Citation:
PMID:  19162928     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Valve hydrodynamic performance is usually assessed by effective orifice area, transvalvular resistance, regurgitation and blood damage effect. Some studies suggest effects in effective orifice area due to cardiovascular resistance, compliance and angle position of the valve. We suppose that silicone rubber valves under study have a good performance under different cardiovascular resistance conditions. Two in vitro experiments were made to test this hypothesis under constant and pulsatile flow rate. Transvalvular gradient pressure, transvalvular resistance, Gorling effective orifice area, effective orifice area in the ascending aorta and Reynolds numbers were estimated in both flow rates. Results suggest that cardiovascular resistance has no significant effect for this kind of valves, however resistance effect is observed in pumping pressure. Small transvalvular resistance and transvalvular pressure gradients were found. Gorlin effective orifice areas greater than 0.3 cm(2) have not viscosity effect. P-value 0.001 was found between Gorlin effective orifice area under constant and pulsatile flow rate.
Authors:
J Garcia; E Sacristan
Related Documents :
8776528 - Utilization of translesional hemodynamics: comparison of pressure and flow methods in s...
3180498 - Theoretical considerations of nasal airflow mechanics and surgical implications.
7621478 - Is there a reasonable differential indication for different hydrocephalus shunt systems?
20453558 - Novel method for controlling cerebrospinal fluid flow and intracranial pressure by use ...
16121198 - Influence of childhood socioeconomic circumstances, height, and obesity on pulse pressu...
11555538 - Physiology of vasopressin relevant to management of septic shock.
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference     Volume:  2008     ISSN:  1557-170X     ISO Abbreviation:  Conf Proc IEEE Eng Med Biol Soc     Publication Date:  2008  
Date Detail:
Created Date:  2009-02-16     Completed Date:  2009-05-05     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101243413     Medline TA:  Conf Proc IEEE Eng Med Biol Soc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1393-6     Citation Subset:  IM    
Affiliation:
Laval Hospital Research Center, Laval University, Quebec, Canada. Julio.Garcia@crhl.ulaval.ca
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Blood Flow Velocity / physiology
Heart Valve Prosthesis*
Hemodynamics
Hemorheology
Models, Cardiovascular*
Pulsatile Flow / physiology

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Physiological role of nitric oxide in oxygen consumption by arteriolar wall.
Next Document:  Aortic impedance in Little mice.