Left ventricular discoordination index measured by speckle tracking strain rate imaging predicts reverse remodelling and survival after cardiac resynchronization therapy

Chun Li Wang, Brian D. Powell, Margaret M. Redfield, Chinami Miyazaki, Nowell M. Fine, Lyle J. Olson, Yong Mei Cha, Raul E. Espinosa, David L. Hayes, David O. Hodge, Grace Lin, Paul A. Friedman, Jae K. Oh

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

Aims This study aimed to evaluate the predictive value of a baseline speckle tracking strain rate imaging-derived discoordination index for response to cardiac resynchronization therapy (CRT). Methods and results Ninety-seven patients with QRS <120 ms and left ventricular (LV) ejection fraction ≤35% were prospectively followed after CRT in the Mayo CRT Registry. The LV discoordination index (stretch/shortening or thinning/thickening during ejection) was calculated from three types of deformation, radial, circumferential, and longitudinal, using two-dimensional speckle tracking strain rate imaging. The benefit of CRT was evaluated by reverse remodelling (i.e. reduction of LV end-systolic volume <15% at 6-month follow-up) and survival. The optimal cut-off value of the baseline discoordination index in discriminating responders from non-responders was determined by receiver operating characteristic curve analysis. Significant differences in baseline indices between responders and non-responders were noted for radial and circumferential discoordination indices. A mid-ventricular radial discoordination index (RDI-M) >38% best predicted responders, especially in patients with ischaemic cardiomyopathy (area under the curve 0.86 for all patients, sensitivity 80%, and specificity 91%). Death occurred in 28 patients over a median follow-up of 3.2 years. When adjusted for confounding variables, lack of significant discoordination (RDI-M <38%) before CRT was associated with a particularly high mortality (hazard ratio 7.05, 95% confidence interval 2.45-26.0). Conclusion LV discoordination assessed by speckle tracking RDI-M imaging was able to predict reverse remodelling at 6 months and survival of patients who received CRT.

Original languageEnglish (US)
Pages (from-to)517-525
Number of pages9
JournalEuropean Journal of Heart Failure
Volume14
Issue number5
DOIs
StatePublished - May 1 2012

Keywords

  • Cardiac resynchronization therapy
  • Strain rate imaging
  • Survival
  • Ventricular discoordination

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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