Article Text

This article has a correction. Please see:

other Versions

PDF
Tissue synchronization imaging accurately measures left ventricular dyssynchrony and predicts response to cardiac resynchronization therapy.
  1. Nico Van de Veire (nico.vandeveire{at}ugent.be)
  1. Ghent University, Belgium
    1. Gabe Bleeker (g.a.bleeker{at}lumc.nl)
    1. Leiden University Medical Center, Netherlands
      1. Johan De Sutter (johan.desutter{at}ugent.be)
      1. Ghent University, Belgium
        1. Claudia Ypenburg (c.ypenburg{at}ugent.be)
        1. Leiden University Medical Center, Netherlands
          1. Eduard Holman (e.holman{at}lumc.nl)
          1. Leiden University Medical Center, Netherlands
            1. Ernst van der Wall (e.vanderwall{at}lumc.nl)
            1. Leiden University Medical Center, Netherlands
              1. Martin Schalij (m.schalij{at}lumc.nl)
              1. Leiden University Medical Center, Netherlands
                1. Jeroen J Bax (j.j.bax{at}lumc.nl)
                1. Leiden University Medical Center, Netherlands

                  Abstract

                  Objectives Tissue synchronization imaging (TSI) is a new technique to assess left ventricular (LV) dyssynchrony. The value of TSI to assess LV dyssynchrony automatically was compared directly to manual assessment of LV dyssynchrony from color-coded tissue Doppler imaging (TDI). In addition, the value of TSI to predict response to cardiac resynchronization therapy (CRT) was evaluated.

                  Methods Sixty symptomatic heart failure patients with depressed LV ejection fraction (LVEF) and QRS >120 ms were evaluated clinically and echocardiographically at baseline and after 6 months of CRT. LV dyssynchrony was measured manually using velocity tracings from the color-coded TDI and automatically using TSI. LV volumes and LVEF were assessed from 2D echocardiography. Clinical responders had to exhibit an improvement in NYHA functional class by >=1 score and an improvement by >=25% in 6-min walking distance after 6 months. Reverse LV remodeling was defined as a reduction of >=15% LV end-systolic volume.

                  Results There was an excellent correlation between LV dyssynchrony measured manually and automatically derived by TSI (r=0.95, p<0.0001). Thirty-four patients showed clinical response after 6 months of CRT and thirty-two patients showed reverse remodeling. Baseline characteristics were comparable between responders and non-responders, except for more extensive LV dyssynchrony in the responders: 78(26) ms vs 29(29) ms (p<0.0001) as assessed manually, and 79(29) ms vs 28(27) ms (p<0.0001) as assessed with TSI. Using a cutoff value of 65 ms to define extensive LV dyssynchrony, TSI had sensitivity of 81% with a specificity of 89% to predict reverse LV remodeling.

                  Conclusion TSI allows automatic and reliable assessment of LV dyssynchrony and predicts reverse LV remodeling after CRT.

                  Statistics from Altmetric.com

                  Request permissions

                  If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.

                  Linked Articles

                  • Correction
                    BMJ Publishing Group Ltd and British Cardiovascular Society