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

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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.

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Acknowledgments

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

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Authors and Affiliations

  1. Department of Cardiology, Sun Yat-sen Memorial Hospital of Sun Yat-sen University, 107 West Yanjiang Road, Guangzhou, 510120, China

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

  2. Guangdong Province Key Laboratory of Arrhythmia and Electrophysiology, Guangzhou, 510120, China

    Qiong Qiu, Yang-xin Chen, Jing-ting Mai & Jing-feng Wang

Authors
  1. Qiong Qiu
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  2. Yang-xin Chen
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  3. Jing-ting Mai
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  4. Wo-liang Yuan
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  5. Yu-lin Wei
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  6. Ying-mei Liu
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  7. Li Yang
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  8. Jing-feng Wang
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Correspondence to Li Yang or Jing-feng Wang.

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Qiong Qiu and Yang-xin Chen have contributed equally to this work.

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Qiu, Q., Chen, Yx., Mai, Jt. et al. Effects of cardiac resynchronization therapy on left ventricular remodeling and dyssynchrony in patients with left ventricular noncompaction and heart failure. Int J Cardiovasc Imaging 31, 329–337 (2015). https://doi.org/10.1007/s10554-014-0568-8

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  • DOI: https://doi.org/10.1007/s10554-014-0568-8

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