http://www.ncbi.nlm.nih.gov/pubmed/16758841

Unfortunately the full article is in another language. Basically a case study where the patient has a lumbar myelography (contrast is injected into the spine), loses some hearing, and recovers after epidural blood patch.

http://www.ncbi.nlm.nih.gov/pubmed/20072012

This person did not have a LP prior to symptom onset, but an investigation revealed little to no CSF that was causing auditory and balance issues.

http://www.ncbi.nlm.nih.gov/pubmed/18404909

This patient had hearing loss and a headache 4 days after LP. He was treated with a epidural blood patch and his symptoms improved.

http://www.ncbi.nlm.nih.gov/pubmed/8534460

Here is a small study that showed that an epidural blood patch improved symptoms in patients that had hearing loss and headache after receiving a needle in their spine.