<qa>  What is the GE Vivid 7 and HP echocardiographic system?Echocardiographic assessment Standard 2-dimensional, M-mode, and Doppler evaluation will be performed. We will assess cardiac function using left ventricular shortening SF and ejection fractions EF measured by Simpsons Rule. We will also perform tissue synchronization imaging TSI, tissue Doppler imaging TDI, and 3D echocardiography using the GE Vivid 7 and HP echocardiographic systems. These systems will assist investigators in determining ventricular function and synchrony. 