Some reports maintain that a cold or other upper respiratory illness preceded the onset of SSNHL in as many as 40 percent of cases. Unfortunately, these reports lack corresponding data on the comparative frequency of upper respiratory illness in a matched control population. What about the evidence of blood examinations? In response to a virus, the immune system produces a temporary increase in the level of antibodies against the speciﬁc virus, and many case reports on patients with SSNHL show that they experience a brief, sharp rise in antibody levels against common viruses such as herpes, ﬂu, mumps, or rubella.
In some instances, your specialist may recommend that you undergo an injection of gentamicin into the middle ear instead of a steroid. Gentamicin is an antibiotic which is known to have mildly toxic effects on both the balance and hearing parts of the ear, although its toxic effects on the vestibular system are very much more potent than on the hearing. Despite this, there is an increased chance of a hearing loss occurring with intratympanic gentamicin injections. For this reason, they are usually reserved for patients with a pre-existing severe hearing loss at the time the vertigo is diagnosed.