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Abduch, M.C., Salgo, I., Tsang, W., Vieira, M.L., Cruz, V., Lima, M., Tsutsui, J.M., Mor-Avi, V., Lang, R.M. and Mathias Jr., W. (2012) Myocardial Deformation by Speckle Tracking in Severe Dilated Cardiomyopathy. Arquivos Brasileiros de Cardiologia, 99, 834-843.
https://doi.org/10.1590/S0066-782X2012005000086

has been cited by the following article:

• TITLE: Impact of Left Bundle Branch Block on Left Ventricular Mechanics in Patients with Idiopathic Dilated Cardiomyopathy

  AUTHORS: Ahmed Emara, Hala Mahfouz Badran, Waleed Abdou, Naglaa Fahim, Mohamed Fathi, Magdi H. Yacoub

  KEYWORDS: Idiopathic Dilated Cardiomyopathy, LBBB, 2D Strain Imaging

  JOURNAL NAME: World Journal of Cardiovascular Diseases, Vol.9 No.2, February 26, 2019

  ABSTRACT: Objectives: Left bundle branch block (LBBB) is commonly associated with heart failure. We evaluated the prevalence and impact of LBBB on left ventricular mechanics using 2D strain imaging in patients with idiopathic dilated cardiomyopathy (IDCM). Methods: We included 101 patients with IDCM with mean age 38 ± 18 years: 74% were males and 13.9% of them were in NYHA Class III-IV. LBBB was present in 26 (37%) of included patients. Myocardial mechanics including longitudinal, circumferential strain and rotation and LV synchronization were assessed using two-dimensional strain imaging. Results: LBBB group had higher LV volumes, and PAP compared with non LBBB. Peak LV longitudinal systolic strain (εsys) of the septum and global LV SRsys were significantly lower in LBBB compared to non LBBB group (P 0.01, 0.03). TTP-d was greater in LBBB in comparison to non LBBB group (274.5 ± 116 versus 209.4 ± 139, P 0.02). The electromechanical delay between septal segments was 35 ± 18 ms and between lateral wall segments: 48 ± 24 ms, between anterior wall segments: 21 ± 11 and between inferior wall segments: 41 ± 12. Consequently, LV mechanical dyssynchrony was more evident in IDCM patients with LBBB. QRS width was correlated inversely with LV longitudinal strain and strain rate and electromechanical delay (P 0.0001) in non LBBB group. In LBBB QRS width was not related to cardiac mechanics. Using univariate analysis and after a multiple covariate adjustment, the baseline LBBB was associated with a significantly increased LV dysfunction. Conclusion:After correcting for potential confounders, LBBB was found to be associated with more deterioration of LV mechanics and exaggerated LV dyssynchrony in patients with IDCM.