The present invention provides compositions useful for treating and preventing ryanodine receptor associated disorders comprising a PDE-associated agent and a pharmaceutically acceptable carrier. The present invention also provides methods for treating or preventing ryanodine receptor associated disorders including cardiac disorders and diseases, skeletal muscular disorders and diseases, cognitive disorders and diseases malignant hyperthermia, diabetes and sudden infant death syndrome. The present invention further provides methods for regulating PKA phosphorylation of a ryanodine receptor as well as methods for regulating Ca+2 release and reuptake in cells. Also provided are kits for use in delivering a PDE-associated agent to cardiac cells in a subject, comprising the composition of the present invention and a catheter.