Medical News Today -- King Pharmaceuticals, Inc. (NYSE: KG) announced that the U.S. Food and Drug Administration (FDA) issued a complete response letter regarding the New Drug Application (NDA) for CorVue™ (binodenoson) for injection. CorVue™ is a cardiac pharmacologic stress agent for use as an adjunct in SPECT (single-photon-emission computed tomographic) cardiac imaging intended for use in patients with or at risk for coronary artery disease (CAD) who are unable to perform a cardiac exercise stress test.