The purpose of the study is to give more information about how the VIVO software and inHEART software merge together and what potential benefits this could provide the physician for planning ablation procedures. In addition, the study will also provide information about the accuracy of VIVO in varying degrees of damaged hearts.

The purpose of this research study is to evaluate a different way to program a Cardiac Resynchronization Therapy Defibrillator (CRT-D) through the use of software built into the CRT-D system. A CRT-D does not cure heart failure, but many people who receive a CRT device note that they feel better. The objective of the device programming required by the study is to see if it reduces the size of the heart and make the heart pump more effectively.