Document Detail


Left ventricular muscle and fluid mechanics in acute myocardial infarction.
MedLine Citation:
PMID:  21059428     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Left ventricular (LV) diastolic filling is characterized by the formation of intraventricular rotational bodies of fluid (termed "vortex rings") that optimize the efficiency of LV ejection. The aim of the present study was to evaluate the morphology and dynamics of LV diastolic vortex ring formation early after acute myocardial infarction (AMI), in relation to LV diastolic function and infarct size. A total of 94 patients with a first ST-segment elevation AMI (59 ± 11 years; 78% men) were included. All patients underwent primary percutaneous coronary intervention. After 48 hours, the following examinations were performed: 2-dimensional echocardiography with speckle-tracking analysis to assess the LV systolic and diastolic function, the vortex formation time (VFT, a dimensionless index for characterizing vortex formation), and the LV untwisting rate; contrast echocardiography to assess LV vortex morphology; and myocardial contrast echocardiography to identify the infarct size. Patients with a large infarct size (≥ 3 LV segments) had a significantly lower VFT (p <0.001) and vortex sphericity index (p <0.001). On univariate analysis, several variables were significantly related to the VFT, including anterior AMI, LV end-systolic volume, LV ejection fraction, grade of diastolic dysfunction, LV untwisting rate, and infarct size. On multivariate analysis, the LV untwisting rate (β = -0.43, p <0.001) and infarct size (β = -0.33, p = 0.005) were independently associated with VFT. In conclusion, early in AMI, both the LV infarct size and the mechanical sequence of diastolic restoration play key roles in modulating the morphology and dynamics of early diastolic vortex ring formation.
Authors:
Gaetano Nucifora; Victoria Delgado; Matteo Bertini; Nina Ajmone Marsan; Nico R Van de Veire; Arnold C T Ng; Hans-Marc J Siebelink; Martin J Schalij; Eduard R Holman; Partho P Sengupta; Jeroen J Bax
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American journal of cardiology     Volume:  106     ISSN:  1879-1913     ISO Abbreviation:  Am. J. Cardiol.     Publication Date:  2010 Nov 
Date Detail:
Created Date:  2010-11-09     Completed Date:  2010-12-02     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0207277     Medline TA:  Am J Cardiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1404-9     Citation Subset:  AIM; IM    
Copyright Information:
Copyright © 2010 Elsevier Inc. All rights reserved.
Affiliation:
Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands.
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MeSH Terms
Descriptor/Qualifier:
Biomechanics
Female
Heart Ventricles / physiopathology*
Hemodynamics
Humans
Male
Middle Aged
Myocardial Contraction
Myocardial Infarction / physiopathology*
Regional Blood Flow

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


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