Unilateral Hearing Loss
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Research reports on hearing loss from J.M. Clift and colleagues provide new insights
2009 JUN 29 - (NewsRx.com) -- According to a study from the United States, "We analyzed whether radiographically demonstrated anterior inferior cerebellar artery (AICA) vascular compression of the cochleovestibular nerve in asymmetric hearing loss could be correlated to either the symptomatic ear or to cochlear nerve diameter. We undertook a retrospective case-control study in which patients were enrolled into a database if audiometry demonstrated asymmetry of 20 dB at one frequency, asymmetry of 10 dB at two frequencies, or a difference of 20% on word recognition scores." "If AICA vascular contact was demonstrated on subsequent magnetic resonance imaging of the cerebellopontine angle, patients were included in the study. Patients with vestibular schwannoma or Meniere's disease were excluded. The AICA contact was graded by a blinded neuroradiologist according to criteria proposed by McDermott et al. The cross-sectional area of the cochlear nerve was measured. Symptomatic ears could be correlated to a decreased cochlear nerve diameter, but not to the degree of AICA penetration into the internal auditory canal. AICA vascular compression of the cochleovestibular nerve does not appear to correlate to hearing loss or to cochlear nerve diameter," wrote J.M. Clift and colleagues. The researchers concluded: "The finding of decreased cochlear nerve diameter in symptomatic ears implies an alternative mechanism for asymmetric hearing loss." Clift and colleagues published their study in Annals of Otology Rhinology and Laryngology (Radiographic Analysis of Cochlear Nerve Vascular Compression. Annals of Otology Rhinology and Laryngology, 2009;118(5):356-361). For more information, contact K.P. Boyev, University of Southern Florida, Dept. of Otolaryngology Head & Neck Surgery, 12901 Bruce B Downs Blvd., MDC 73, Tampa, FL 33612, USA. Publisher contact information for the journal Annals of Otology Rhinology and Laryngology is: Annals Publ Co., 4507 Laclede Avenue, St. Louis, MO 63108, USA. Keywords: United States, Tampa, Angiology, Anterior Inferior Cerebellar Artery, Audiology, Clinical Trial Research, Laryngology, Magnetic Resonance, Nerve Compression Syndrome, Neurology, Otolaryngology, Otology, Rhinology, Sensorineural Hearing Loss, Unilateral Hearing Loss. This article was prepared by Pain & Central Nervous System Week editors from staff and other reports. Copyright 2009, Pain & Central Nervous System Week via NewsRx.com.
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