<qa>  What is the EF calculated using?Echocardiographic assessment Standard 2-dimensional, M-mode, and Doppler or 3-dimensional echocardiography evaluation will be performed. We will assess cardiac function using left ventricular shortening SF and ejection fractions EF. The EF will be calculated using both M-Mode and by Simpsons rule. We will also perform tissue synchronization imaging TSI and tissue Doppler imaging TDI using the GE Vivid 7 echocardiographic system. Both TSI and TDI will assist investigators in assessing mechanical synchrony. In newly transplanted patients, these echocardiographic assessments will occur during the first 5 days to serially measure ventricular synchrony during the acute post-operative period. For older transplant patients and for new transplant patients greater than five days out from transplantation, echocardiographic studies will occur at all follow-up clinic visits as determined by physician preference. 