A 52-year-old man presents to the emergency department with sudden onset unilateral hearing loss noticed upon waking this morning. Audiometry confirms a flat severe sensorineural hearing loss of 45 dB across all frequencies developing over 18 hours. Weber test lateralizes to the better ear and Rinne shows air-bone conduction bilaterally. The pattern shown in the diagram marked **A** is consistent with idiopathic sudden sensorineural hearing loss (ISSHL). Which of the following is the MOST appropriate initial management?
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