Electrocochleography in the evaluation of patients with Ménière's disease/endolymphatic hydrops.
Electrocochleography (ECochG) has evolved as an important tool in the diagnosis/assessment/monitoring of Ménière's disease/endolymphatic hydrops (MD/ELH). This manuscript provides an update on the use of ECochG for these purposes. The material presented includes descriptions of the components of the electrocochleogram; ECochG recording approaches and parameters; how to prepare for an exam, including subject/patient considerations; construction and placement of a tympanic membrane recording electrode; and interpretation the electrocochleogram. Various approaches aimed at improving ECochG's sensitivity and specificity to MD/ELH also are described. These approaches go beyond simple measurement of the now-conventional summating potential (SP)/action potential (AP) magnitude ratio to include the SP magnitude to tonebursts, the SP/AP area ratio, and the AP latency difference to clicks of opposing polarity.
Ferraro
John A
JA
Hearing and Speech Department, University of Kansas Medical Center, Kansas City, KS 66160-7605, USA. jferraro@kumc.edu
Durrant
John D
JD
D000161:Acoustic Stimulation; D000200:Action Potentials / Q000502:physiology; D001300:Audiometry, Evoked Response / Q000379:methods*; D018159:Endolymphatic Hydrops / Q000175:diagnosis* / Q000503:physiopathology; D006801:Humans; D008575:Meniere Disease / Q000175:diagnosis* / Q000503:physiopathology; D012680:Sensitivity and Specificity