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Effects of cardiac resynchronization therapy on left ventricular remodeling and dyssynchrony in patients with left ventricular noncompaction and heart failure

  • Qiong Qiu
  • Yang-xin Chen
  • Jing-ting Mai
  • Wo-liang Yuan
  • Yu-lin Wei
  • Ying-mei Liu
  • Li Yang
  • Jing-feng Wang
Original Paper

Abstract

Left ventricular noncompaction (LVNC) is a rare cardiomyopathy with high incidence of heart failure (HF). It is unclear whether LVNC patients with desynchronized HF would benefit from cardiac resynchronization therapy (CRT). In order to evaluate the effect of CRT on LVNC, this study explored left ventricular (LV) remodeling and mechanical synchronicity before and after CRT in LVNC patients, and compare with that in idiopathic dilated cardiomyopathy (DCM) patients. We collected 15 LVNC and 30 matched DCM patients. All the patients underwent clinical evaluation,electrocardiogram and echocardiography before CRT and ≥6 months later. LV response was defined as ≥15 % decrease in LV end-systolic volume (LVESV). Longitudinal synchronicity was quantified by YU-index using tissue Doppler imaging. The time delay of peak radial strain from anteroseptal to posterior wall, which derived from speckle tracking imaging, was used to quantify radial synchronicity. In LVNC group, LV ejection fraction increased from 27.6 ± 5.5 to 39.1 ± 7.0 % (P < 0.01) during follow-up, but LV volumes did not change significantly (both P > 0.05). Five LVNC patients (33.3 %) responded to CRT, and all of them were super-responders (reduction in LVESV > 30 %). In addition, the number of noncompacted segments and the thickness ratio of noncompacted to compacted myocardium decreased (both P < 0.05). Inter-ventricular, longitudinal and radial intra-ventricular dyssynchrony also reduced significantly (all P < 0.05). Compared with DCM group, there was no significant difference in LV response rate (33.3 vs. 60.0 %, P = 0.092), improvement of LV function and dyssynchrony index (all P < 0.05). In conclusion, CRT improved heart function, morphology and mechanical dyssynchrony in LVNC patients.

Keywords

Left ventricular noncompaction Heart failure Cardiac resynchronization therapy Speckle tracking imaging 

Notes

Acknowledgments

This study was supported by Guangdong Provincial Science & Technology Project, China (No. 2012B031800049); Guangdong Province Natural Science Fund, China (No. 10451008901004814).

Conflict of interest

None.

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Qiong Qiu
    • 1
    • 2
  • Yang-xin Chen
    • 1
    • 2
  • Jing-ting Mai
    • 1
    • 2
  • Wo-liang Yuan
    • 1
  • Yu-lin Wei
    • 1
  • Ying-mei Liu
    • 1
  • Li Yang
    • 1
  • Jing-feng Wang
    • 1
    • 2
  1. 1.Department of CardiologySun Yat-sen Memorial Hospital of Sun Yat-sen UniversityGuangzhouChina
  2. 2.Guangdong Province Key Laboratory of Arrhythmia and ElectrophysiologyGuangzhouChina

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