The purpose of this study is to evaluate the effects of treatment with an experimental, low-powered electromagnetic device called the Electro Cellular Health Care Solutions (ECHS) Cardiac Device in people who have had a recent heart attack. Researchers aim to learn about the effects of treatment on recovery, as well as the magnitude of any effects. Previous studies suggest that the use of pulsed electromagnetic field produces improved outcomes in other health conditions, such as angina (chest pain) and arthritis. Study procedures will include magnetic resonance imaging procedures (MRIs) and echocardiograms (ultrasounds of the heart). Participants will be asked to wear a simple, lightweight device on their chest for 15 minutes, 2 to 3 times per day. Researchers will compare the effects, if any, of the ECHS non-invasive cardiac device on recovery from a heart attack when compared with the effects of a placebo (inactive) device. Participants will be randomly assigned to either the ECHS treatment group or the SHAM (placebo) group.