Abstract
The “cochlear” aqueduct is a narrow channel connecting the subarachnoid and intralabyrinthine spaces. Through this communication, cerebrospinal fluid (CSF) pressure variations are transmitted to the intralabyrinthine space and modify the impedance of the ear. Distortion-product otoacoustic emissions (DPOAE) are sounds emitted by cochlear sensory cells in response to sonic stimulation. Cochlear microphonic potentials (CMP) express the electrophysiological activity of cochlear sensory cells. At 1 kHz, the phase of DPOAE and CMP varies according to the impedance of the ear and thus to intracranial pressure (ICP) variations. DPOAE and CMP have been shown to strictly follow ICP variations produced during infusion tests performed in the diagnosis of chronic hydrocephalus. DPOAE and CMP recordings appear to be valuable tools for monitoring ICP non-invasively.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Similar content being viewed by others
References
Allen GW, Habibi M (1962) The effect of increasing cerebrospinal fluid pressure upon cochlear microphonics. Laryngoscope 72:423
Avan P, Büki B, Maat B, Dordain M, Wit HP (2000) Middle ear influence on otoacoustic emissions. I: non-invasive investigation of the human transmission apparatus and comparison with model results. Hear Res 140:189–201
Büki B, Avan P, Dordain M, Lemaire JJ, Chazal J, Ribari O (1996) Otoacoustic emissions: a new tool for monitoring intracranial pressure changes through stapes displacements. Hear Res 94:125–139
Büki B, Giraudet F, Avan P (2009) Non-invasive measurements of intralabyrinthine pressure changes by electrocochleography and otoacoustic emissions. Hear Res 251:51–59
Ghajar J (1995) Intracranial monitoring techniques. New Horiz 3:395–399
Gopen Q, Rosowski JJ, Merchant SN (1997) Anatomy of the normal human aqueduct with functional implications. Hear Res 107:9–22
Klockhoff I, Anggard G, Anggard L (1964) The acoustic impedance of the ear and cranio-labyrinthine pressure transmission. Int J Audiol 4:45
Philips AJ, Farrell GB (1992) The effect of posture on three objective audiological measurements. Br J Audiol 26:339–345
Ritter FN, Lawrence M (1965) A histological and experimental study of cochlear aqueduct patency in the adult human. Laryngoscope 65:1224–1233
Traboulsi R, Avan P (2007) Transmission of infrasonic pressure waves from cerebrospinal to intralabyrinthine fluids through the human cochlear aqueduct: non-invasive measurements with otoacoustic emissions. Hear Res 233:30–39
Waltner JG (1948) Barrier membrane of the cochlear aqueduct. Arch Otolaryngol 47:656–669
Wlodyka J (1978) Studies on cochlear aqueduct patency. Ann Otol Rhinol Laryngol 87:22–28
Acknowledgements
Echodia has provided the device for DPOAE and CMP recordings. The study has been entirely funded by grant ANR-08-ETEC-001-01.
Conflict of interest statement
We declare that we have no conflict of interest.
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2012 Springer-Verlag/Wien
About this chapter
Cite this chapter
Sakka, L., Thalamy, A., Giraudet, F., Hassoun, T., Avan, P., Chazal, J. (2012). Electrophysiological Monitoring of Cochlear Function as a Non-invasive Method to Assess Intracranial Pressure Variations. In: Schuhmann, M., Czosnyka, M. (eds) Intracranial Pressure and Brain Monitoring XIV. Acta Neurochirurgica Supplementum, vol 114. Springer, Vienna. https://doi.org/10.1007/978-3-7091-0956-4_24
Download citation
DOI: https://doi.org/10.1007/978-3-7091-0956-4_24
Published:
Publisher Name: Springer, Vienna
Print ISBN: 978-3-7091-0955-7
Online ISBN: 978-3-7091-0956-4
eBook Packages: MedicineMedicine (R0)