Sudden Sensorineural Hearing Loss (SSNHL) multicenter study is a prospective randomized clinical trial consisting of a head-to-head comparison of oral prednisone and intratympanic (IT), methylprednisolone sodium succinate for primary treatment of idiopathic SSNHL. (PI-Bruce Gantz), contact Study Nurse Coordinator-Deb Strike (319-356-3345).