title: Hearing outcomes after loss of brainstem auditory evoked potentials during microvascular decompression.
abstract: The primary aim of this paper is to study the pre-operative characteristics, intra-operative changes and post-operative hearing outcomes in patients after complete loss of wave V of the brainstem auditory evoked potential. We retrospectively analyzed the brainstem auditory evoked potential data of 94 patients who underwent microvascular decompression for hemifacial spasm at our institute. Patients were divided into two groups - those with and those without loss of wave V. The differences between the two groups and outcomes were assessed using t-test and chi-squared tests. In our study 23 (24%) patients out of 94 had a complete loss of wave V, with 11 (48%) patients experiencing transient loss and 12 (52%) patients experiencing permanent loss. The incidence of hearing loss in patients with no loss of wave V was 5.7% and 26% in patients who did experience wave V loss. The incidence of hearing change in patients with no loss of wave V was 12.6% and 30.43% in patients who did experience wave V loss. Loss of wave V during the procedure or at the end of procedure significantly increases the odds of hearing loss. Hearing change is a significant under-reported clinical condition after microvascular decompression in patients who have loss of wave V.
authors: Department of Neurological Surgery, University of Pittsburgh Medical Centre, Suite B-400, 200 Lathrop Street, Pittsburgh, PA 15213, USA; Department of Neurology, University of Pittsburgh Medical Centre, Pittsburgh, PA, USA. Electronic address: thirumalapd@upmc.edu.
authors: Parthasarathy D
authors: PD
authors: Thirumala
authors: Department of Neurology, Penn State Hershey Medical Center, Hershey, PA, USA.
authors: Balaji
authors: B
authors: Krishnaiah
authors: Department of Neurological Surgery, University of Pittsburgh Medical Centre, Suite B-400, 200 Lathrop Street, Pittsburgh, PA 15213, USA.
authors: Miguel E
authors: ME
authors: Habeych
authors: Department of Neurological Surgery, University of Pittsburgh Medical Centre, Suite B-400, 200 Lathrop Street, Pittsburgh, PA 15213, USA.
authors: Jeffrey R
authors: JR
authors: Balzer
authors: Department of Neurological Surgery, University of Pittsburgh Medical Centre, Suite B-400, 200 Lathrop Street, Pittsburgh, PA 15213, USA.
authors: Donald J
authors: DJ
authors: Crammond
mesh_terms: D000328:Adult; D001301:Audiometry, Pure-Tone; D004569:Electroencephalography; D016057:Evoked Potentials, Auditory, Brain Stem; D005260:Female; D007839:Functional Laterality; D006309:Hearing; D006311:Hearing Disorders / Q000209:etiology / Q000503:physiopathology; D034381:Hearing Loss / Q000209:etiology* / Q000503:physiopathology*; D019569:Hemifacial Spasm / Q000503:physiopathology / Q000601:surgery; D006801:Humans; D015994:Incidence; D008297:Male; D061145:Microvascular Decompression Surgery / Q000379:methods*; D008875:Middle Aged; D016343:Monitoring, Intraoperative; D011183:Postoperative Complications / Q000503:physiopathology*; D012189:Retrospective Studies; D016896:Treatment Outcome
keywords: Brainstem auditory evoked potential; Hearing loss; Hemifacial spasm; Microvascular decompression