Document Detail


Inflow typology and ventricular geometry determine efficiency of filling in the hypoplastic left heart.
MedLine Citation:
PMID:  22858280     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
BACKGROUND: Pediatric patients with hypoplastic left heart syndrome rely solely on the right ventricle, resulting in anatomic maladaptations that can significantly compromise diastolic efficiency and lead to heart failure. Clinical indices to evaluate diastole are generally derived from the adult left ventricle, limiting their relevance to patients with hypoplastic left heart syndrome. We investigated the effect of the ventricular cavity shape and tricuspid inflow typology on the filling dynamics to provide new directions of investigation for assessing diastolic function in these patients.
METHODS: Magnetic resonance imaging data were used to generate personalized mathematic models of 4 patients with different prognoses after stage I of the Norwood procedures. Two of these patients were also modeled after stage II. Numeric simulations were performed to analyze the interaction between blood flow and the myocardium during diastole.
RESULTS: The filling dynamics were characterized by the formation of an organized structure of swirling blood (vortex ring). This was strongly influenced by the ventricular shape and the timing of the E and A wave. Biphasic rather than fused inflows and more elliptical than spherical cavities were found to increase the intraventricular pressure gradients and the filling capacity by optimizing the energy transfer between blood flow and the myocardium. This resulted in a better flow propagation and higher tissue velocities and displacements.
CONCLUSIONS: The variations in the kinetic energy associated with the blood motion reflected the base-to-apex pressure difference and can therefore be used to quantify the efficiency of filling, providing a potential new metric to assess diastolic function in these patients.
Authors:
Adelaide de Vecchi; David A Nordsletten; Espen W Remme; Hannah Bellsham-Revell; Gerald Greil; John M Simpson; Reza Razavi; Nicolas P Smith
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2012-08-02
Journal Detail:
Title:  The Annals of thoracic surgery     Volume:  94     ISSN:  1552-6259     ISO Abbreviation:  Ann. Thorac. Surg.     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-10-26     Completed Date:  2013-01-07     Revised Date:  2014-02-20    
Medline Journal Info:
Nlm Unique ID:  15030100R     Medline TA:  Ann Thorac Surg     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  1562-9     Citation Subset:  AIM; IM    
Copyright Information:
Copyright © 2012 The Society of Thoracic Surgeons. Published by Elsevier Inc. All rights reserved.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Heart Ventricles / pathology*,  physiopathology*
Humans
Hypoplastic Left Heart Syndrome / physiopathology*
Magnetic Resonance Imaging
Models, Cardiovascular
Regional Blood Flow
Grant Support
ID/Acronym/Agency:
MR/J006742/1//Medical Research Council
Comments/Corrections
Comment In:
Ann Thorac Surg. 2012 Nov;94(5):1569   [PMID:  23098934 ]

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


Previous Document:  Management of Giant Congenital Pulmonary Airway Malformations Requiring Pneumonectomy.
Next Document:  Anthelmintic cyclcooctadepsipeptides: complex in structure and mode of action.