Document Detail


Dynamic change in the left ventricular base with or without a rigid mitral valve prosthesis.
MedLine Citation:
PMID:  9360068     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
To evaluate the narrowing of the left ventricular outflow tract (LVOT) during systole caused by a rigid mitral prosthesis, the geometric relationship between the prosthesis (or the mitral annulus) and the left ventricular base (LVB) was studied in five patients with mechanical mitral valve prostheses and eight normal subjects. The images of the mitral valve annulus (MVA) and the LVOT orifice reconstructed in three dimensions were projected on the plane of the LV base. Calculating the areas of these projected images (i.e., those for MVA [Sm], LVOT orifice [So], the LVB [Sb; Sb = Sm + So]), the MVA-LVB ratio (Sm/Sb) was determined. In the normal subject, the MVA-LVB ratio was nearly constant during systole (59 +/- 5% at 0 msec and 62 +/- 7% at 300 msec, respectively), whereas in the patients with prostheses, the ratio increased from 61 +/- 4% (0 msec) to 69 +/- 4% (300 msec). The increase in MVA-LVB ratio reduces the proportionate share of LVOT orifice in relation to the total LVB. The ideal mitral valve prosthesis should be flexible at the annulus to attain good performance in LVB dynamics.
Authors:
T Komoda; R Hetzer; J Hofmeister; Y G Weng; J Oellinger; H Siniawski; M Hübler; R Felix; C Uyama; H Maeta
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  ASAIO journal (American Society for Artificial Internal Organs : 1992)     Volume:  43     ISSN:  1058-2916     ISO Abbreviation:  ASAIO J.     Publication Date:    1997 Sep-Oct
Date Detail:
Created Date:  1998-01-15     Completed Date:  1998-01-15     Revised Date:  2006-05-23    
Medline Journal Info:
Nlm Unique ID:  9204109     Medline TA:  ASAIO J     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  M392-5     Citation Subset:  IM    
Affiliation:
Department of Cardiovascular Surgery, German Heart Institute Berlin, Germany.
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MeSH Terms
Descriptor/Qualifier:
Adult
Aged
Biomechanics
Case-Control Studies
Heart / anatomy & histology*,  physiology*
Heart Valve Prosthesis*
Humans
Magnetic Resonance Imaging
Male
Middle Aged
Mitral Valve* / anatomy & histology,  physiology
Myocardial Contraction
Systole
Ventricular Function, Left

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


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