title: [Phanerogenetic retrocochlear low frequency hearing loss].
abstract: OBJECTIVE
  To study the pathogenisis of retrocochlear low frequency hearing loss.
  
  
  METHODS
  Clinical and audiologic findings [auditory brainstem response (ABR), evoked otoacoustic emission (EOAE), et al] of 29 cases with retrocochlear low frequency hearing loss were studied.
  
  
  RESULTS
  The head injury, acoustic neuroma, peripheral neurophathy, hereditary hear loss, multiple sclerosis and brainstem disease can cause retrocochlear low frequency hearing loss. The typical clinical manifestations of retrocochlear low frequency hearing loss were normal EOAE which cannot be suppressed by contralateral white noise, but with abnormal ABR as well as with no acoustic reflex and -SP/AP > 0.44.
  
  
  CONCLUSIONS
  The results suggest that phanerogenetic retrocochlear low frequency hearing loss should be a syndrome rather than a disease called "auditory neuropathy". The main lesions of the disease are brainstem, cochlear nuclei and auditory nerve.
authors.affiliation: Department of Otorhinolaryngology and Head & Neck Surgery, General Hospital of PLA, Beijing 100853, China.
authors.forename: Wei-ju
authors.initials: WJ
authors.lastname: Han
authors.forename: Rui
authors.initials: R
authors.lastname: Gu
authors.forename: Li-ming
authors.initials: LM
authors.lastname: Yu
authors.forename: Jie-fu
authors.initials: JF
authors.lastname: Zheng
authors.forename: Na
authors.initials: N
authors.lastname: Zhou
authors.forename: Ju-yang
authors.initials: JY
authors.lastname: Cao
authors.forename: Li
authors.initials: L
authors.lastname: Wang
mesh_terms: D000293:Adolescent; D000328:Adult; D020295:Brain Stem Neoplasms / Q000150:complications / Q000175:diagnosis; D002648:Child; D003390:Cranial Nerve Neoplasms / Q000150:complications* / Q000175:diagnosis; D006259:Craniocerebral Trauma / Q000150:complications / Q000175:diagnosis; D003937:Diagnosis, Differential; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D006319:Hearing Loss, Sensorineural / Q000145:classification* / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009464:Neuroma, Acoustic / Q000150:complications* / Q000175:diagnosis; D017084:Otoacoustic Emissions, Spontaneous; D010523:Peripheral Nervous System Diseases / Q000150:complications / Q000175:diagnosis; D014725:Vestibular Nerve