Idiopathic sudden hearing loss (ISHL) is defined as a sensorineural hearing loss of 30 dB or more at least three contiguous frequencies, which develops over a period of a few hours to 72 hours . Its incidence is 520/100.000 or 4,000 new cases per one year . Almost 98% of the patients are affected unilaterally . Although viral infections, vascular disorders, rupture of cochlear membranes, immuno...
