Human heart failure (HF) has been associated with reduced cardiac sodium channel current and other electrical remodeling. Recently, the investigators have shown that downregulation of cardiac Na+ channels (SCN5A) can contribute to arrhythmic risk and that upregulation can mitigate that risk. Furthermore, the investigators have shown that the reduction in cardiac SCN5A mRNA abundance is reflected in circulating white blood cells (WBCs), which also express SCN5A, and that a reduction in SCN5A is highly predictive of appropriate implanted cardiac defibrillator (ICD) therapy. These data suggest that SCN5A regulation contributes to arrhythmic risk in HF. Other electrical remodeling events thought to contribute to arrhythmic risk include reductions in K+ currents, including Ito, IK1 and IKs are responsible. These current reductions have been linked to reduced transcription, translation and expression of the corresponding channel subunits, such as Kv4.3, Kir2.1, KvLQT1, and accessory proteins including minK and K+ channel interacting protein 2. That all these ion channels are downregulated may suggest a common mechanism to reduce ion channel expression. In this application, the investigators intend to explore an entirely novel mechanism by which SCN5A and other ion channel mRNA abundances are reduced in HF.