الفهرس 
Role of Three Dimensional Echocardiography in Detection of Left Ventricular Mechanical Dyssynchrony in Patients with Severe Primary Mitral Regurgitation
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Abstract
We studied various tissue doppler imaging (TDI) and three dimensional echocardiographic (RT3DE) parameters that might predict left ventricular (LV) mechanical dyssynchrony in patients with severe primary mitral regurgitation (MR). The study included 65 patients with severe primary mitral regurgitation; 34 (mean age 30.4 ± 8.0 years) had rheumatic etiology and 31(mean age 32.9 ± 12.6 years) patients diagnosed as mitral valve prolapse. All patients were in normal sinus rhythm. In addition, 22 (mean age 28 ± 6.1 years) age and gender matched healthy subjects were studied and served as a control group. All the studied population underwent history taking, clinical examination and ECG. Detailed transthoracic echocardiogram (TTE) was done. Tissue Doppler imaging (TDI) was performed to determine left ventricular systolic dyssynchrony by measuring Ts - SD (SD of time to peak myocardial systolic velocity during the ejection period). Real time 3D echocardiography (RT3DE) was performed to assess global left ventricular ejection fraction (LVEF) and the systolic dyssynchrony index SDI