Left ventricular twist in patients with left bundle branch block: Missing the obvious in electromechanical coupling
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منابع مشابه
Differing effects of right ventricular pacing and left bundle branch block on left ventricular function.
OBJECTIVE To compare the different effects of right ventricular pacing and classic left bundle branch block on left ventricular function. DESIGN Retrospective and prospective study of 48 patients by electrocardiography, and M mode, cross sectional, and Doppler echocardiography. SETTING A tertiary cardiac referral centre. PATIENTS 48 patients (age range 21 to 89 years, 15 women), 24 with a...
متن کاملLeft and Right Ventricular Volumes and Global Systolic Function in Isolated Left Bundle Branch Block: A Cardiac Magnetic Resonance Imaging Study
Background Echocardiographic studies have shown a reduction in global left ventricular (LV) ejection fraction (LVEF) in patients with isolated left bundle branch block (LBBB). This is likely due to altered electromechanical activation and resultant loss of septal contribution to LV systolic function. We sought to characterize LV volumes and global systolic function in adult subjects with an iso...
متن کاملNature of ventricular activation in patients with dilated cardiomyopathy: evidence for bilateral bundle branch block.
OBJECTIVE To investigate the nature of ventricular activation and its relation with mechanical events in patients with dilated cardiomyopathy. STUDY DESIGN Retrospective and prospective study with 12 lead electrocardiograms, signal averaged electrocardiograms, and M mode and Doppler echocardiograms. SETTING Tertiary cardiac referral centre. PATIENTS 77 patients (mean (SD) age 59(13)) with...
متن کاملVentricular pump function and pacing: physiological and clinical integration.
Optimal cardiac pump function depends on ordered mechanical events that are orchestrated by electrical timing. This electromechanical coupling occurs at multiple anatomic levels: within atria, between atria and ventricles, between ventricles, and especially within the left ventricle (LV). Such disruptions to proper electrical timing result in disordered mechanical events (desynchronization, or ...
متن کاملLeft ventricular twist was decreased in isolated left bundle branch block with preserved ejection fraction
OBJECTIVE Left ventricular (LV) rotation and twist play an important role in LV contraction and relaxation. Left bundle branch block (LBBB) deteriorates both diastolic and systolic functions. We evaluated the LV twist in patients with LBBB and preserved ejection fraction (EF) (>50%) to determine twist as a potential marker for subtle myocardial dysfunction. METHODS This observational cross-se...
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