Prior to the MCG scan, the patient will be instructed to wear only non-metallic containing clothing. Patients's will then be requested to lie still on a table for a duration of 6 minutes, while undergoing a magnetocardiography scan. In addition to the MCG, the patient's blood pressure and a 12-lead electrocardiogram will be obtained. Most patients will also have a complete 2D echocardiogram which will require the patient to lie down on a table while an ultrasound probe is placed on the left side of the chest resulting in an image of the heart on a computer screen. In addition to the above, if clinically indicated patients may have blood draws taken at the discretion of their cardiologist. These blood draws may be used to obtain lipid levels, cardiac biomarkers, and natriuretic peptide assays (used to evaluate heart failure).