Document Detail


Imaging and quantification of myocardial perfusion using real-time three-dimensional echocardiography.
MedLine Citation:
PMID:  16386679     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
OBJECTIVES: We tested the feasibility of real-time three-dimensional echocardiographic (RT3DE) perfusion imaging and developed and validated an algorithm for volumetric analysis of myocardial contrast inflow. The study included three protocols wherein perfusion was measured: 1) in an ex-vivo model of controlled global coronary flow, 2) in an in-vivo model during regional perfusion variations, and 3) in humans during pharmacologically induced hyperemia. BACKGROUND: The RT3DE technology offers an opportunity for myocardial perfusion imaging without multi-slice reconstruction and repeated contrast maneuvers. METHODS: Electrocardiographically triggered harmonic RT3DE datasets were acquired (Philips 7500) while infusion of Definity was initiated and reached a steady state. Protocol 1 was performed in nine isolated rabbit hearts and included three coronary flow levels. In protocol 2, changes in regional perfusion caused by partial left anterior descending artery occlusion were measured in five pigs. In protocol 3, adenosine-induced changes in perfusion were measured in eight normal volunteers. Myocardial video-intensity (MVI) was measured over time in three-dimensional (3D) slices to calculate peak contrast inflow rate (PCIR). In pigs, PCIR was measured on a regional basis and validated against microspheres. RESULTS: The RT3DE imaging allowed selection of slices for perfusion analysis in rabbit hearts, pigs, and humans. Administration of contrast resulted in clearly visible and quantifiable changes in MVI. In rabbits, The PCIR progressively decreased with coronary flow (p < 0.0001). In pigs, coronary occlusion caused a 59 +/- 26% decrease in PCIR exclusively in the left anterior descending artery territory (p < 0.05) in agreement with microspheres. In humans, adenosine increased PCIR to 198 +/- 57% of baseline (p < 0.05). CONCLUSIONS: Contrast-enhanced RT3DE imaging provides the basis for volumetric imaging and quantification of myocardial perfusion.
Authors:
Eran Toledo; Roberto M Lang; Keith A Collins; Georgeanne Lammertin; Ursula Williams; Lynn Weinert; Gil Bolotin; Patrick D Coon; Jai Raman; Lawrence D Jacobs; Victor Mor-Avi
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-12-13
Journal Detail:
Title:  Journal of the American College of Cardiology     Volume:  47     ISSN:  1558-3597     ISO Abbreviation:  J. Am. Coll. Cardiol.     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2006-01-02     Completed Date:  2006-03-27     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8301365     Medline TA:  J Am Coll Cardiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  146-54     Citation Subset:  AIM; IM    
Affiliation:
Noninvasive Cardiac Imaging Laboratory, University of Chicago, Chicago, Illinois 60637, USA.
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MeSH Terms
Descriptor/Qualifier:
Adenosine / diagnostic use
Adult
Animals
Blood Volume
Contrast Media
Coronary Circulation*
Coronary Stenosis / physiopathology,  ultrasonography
Echocardiography, Three-Dimensional*
Fluorocarbons / diagnostic use
Humans
Male
Rabbits
Swine
Ventricular Pressure
Chemical
Reg. No./Substance:
0/Contrast Media; 0/Definity; 0/Fluorocarbons; 58-61-7/Adenosine

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


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