A Novel Feature-Tracking Echocardiographic Method for the Quantitation of Regional Myocardial Function. Validation in an Animal Model of Ischemia-Reperfusion

Bahar Pirat, Dirar S. Khoury, Craig J. Hartley, Les Tiller, Liyun Rao, Daryl G. Schulz, Sherif Nagueh, William A. Zoghbi

Research output: Contribution to journalArticle

224 Scopus citations

Abstract

Objectives: The aim of this study was to validate a novel, angle-independent, feature-tracking method for the echocardiographic quantitation of regional function. Background: A new echocardiographic method, Velocity Vector Imaging (VVI) (syngo Velocity Vector Imaging technology, Siemens Medical Solutions, Ultrasound Division, Mountain View, California), has been introduced, based on feature tracking-incorporating speckle and endocardial border tracking, that allows the quantitation of endocardial strain, strain rate (SR), and velocity. Methods: Seven dogs were studied during baseline, and various interventions causing alterations in regional function: dobutamine, 5-min coronary occlusion with reperfusion up to 1 h, followed by dobutamine and esmolol infusions. Echocardiographic images were acquired from short- and long-axis views of the left ventricle. Segment-length sonomicrometry crystals were used as the reference method. Results: Changes in systolic strain in ischemic segments were tracked well with VVI during the different states of regional function. There was a good correlation between circumferential and longitudinal systolic strain by VVI and sonomicrometry (r = 0.88 and r = 0.83, respectively, p < 0.001). Strain measurements in the nonischemic basal segments also demonstrated a significant correlation between the 2 methods (r = 0.65, p < 0.001). Similarly, a significant relation was observed for circumferential and longitudinal SR between the 2 methods (r = 0.94, p < 0.001 and r = 0.90, p < 0.001, respectively). The endocardial velocity relation to changes in strain by sonomicrometry was weaker owing to significant cardiac translation. Conclusions: Velocity Vector Imaging, a new feature-tracking method, can accurately assess regional myocardial function at the endocardial level and is a promising clinical tool for the simultaneous quantification of regional and global myocardial function.

Original languageEnglish (US)
Pages (from-to)651-659
Number of pages9
JournalJournal of the American College of Cardiology
Volume51
Issue number6
DOIs
StatePublished - Feb 12 2008

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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