The Impact Of Left Ventricular Shape Change On Cardiac Electromechanical Synchronism

Objective: This study evaluated the left ventricular electro- mechanical synchronism in patients with dilated cardiomyopathy (DCM) by echocardiography. To investigate whether the change of left ventricular shape could affect left ventricular systolic, diastolic synchronism and heterogeneity of myocardial repola- rization.Methods: Twenty healthy individuals and forty patients with CHF(sinus rhythm), including nineteen patients with idiopathic dilated cardiomyopathy(IDM) and twenty-one patients with ischemic cardiomyopathy(ICM). Using 2-dimentional guide M- mode, pulse wave and TDI, transthoracic echocardiograms was recorded at rest by HP Sonos 5500 color echocardiographic diagnostic system. We acquired left ventricular ejective fraction (LVEF), and left ventricular systolic, diastolic spherical index (SIs, SId ). The patients were divided into four groups based on SI median value. (Ⅰgroup SIs≤SIs median value,Ⅱgroup SIs≥SIs median value,Ⅲgroup SId≤SId median value,Ⅳgroup SId≥SId median value).From the echocardiography apical four-chamber and apical two-chamber views, the activities of the mitral annulus were recorded by TDI at four positions (septal, lateral, anterior, posterior wall). Systolic electromechanical dispersion (Tcds) is from the electrocardiographic Q or R wave to the peak of systolic wave. Diastolic electromechanical dispersion (Tcde) is from the second heart sound to the peak of early...