Hydromechanical interactions of the intracranial and intralabyrinthine fluids

Marchbanks, R. J.

doi:10.1007/978-3-642-80163-1_7

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…The main transmission path from ICP to the tympanic membrane is assumed to be via the cochlear aqueduct which behaves like a low pass filter transmitting the pressure waves to the perilymphatic fluid (Gopen et al, 1997). The perilymphatic fluid then applies a pressure to the stapes footplate which transmits the pulsatility across the ossicular chain and displaces the tympanic membrane (Marchbanks, 1996). This pathway is not present in those who have an occluded cochlear aqueduct (Carlborg et al, 1982).…”

Section: Discussionmentioning

confidence: 99%

Quantifying the contribution of intracranial pressure and arterial blood pressure to spontaneous tympanic membrane displacement

et al. 2018

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Section: Discussionmentioning

confidence: 99%

Quantifying the contribution of intracranial pressure and arterial blood pressure to spontaneous tympanic membrane displacement

et al. 2018

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“…The size of the spinal needle may be related to the incidence of hearing loss 5 . Moreover, perhaps the auditory symptoms result from drainage of inner ear fluid (perilymph) through the cochlear aqueduct that connects CSF and the cochlear fluids 10 . A transitory intralabyrinthine pressure decrease (i.e.…”

Section: Discussionmentioning

confidence: 99%

The effect of combined spinal-epidural (CSE) anaesthesia and size of spinal needle on postoperative hearing loss after elective caesarean section

Kiliçkan

Gürkan

Aydın³

et al. 2003

Clin Otolaryngol

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The exact aetiology of vestibulocochlear dysfunction after spinal anaesthesia is unknown. Low-frequency hearing loss occurs after spinal anaesthesia. The aim of this study was to investigate the effects of combined spinal-epidural (CSE) anaesthesia and size of spinal needle on vestibulocochlear dysfunction, using pure tone audiometry performed pre- and on the first and the second day postoperatively. Forty-five patients who were to undergo elective caesarean section were evaluated. In group I, CSE anaesthesia (18 G Tuohy, 25 G Whitacre pencil-point-design spinal needles) was performed in 15 patients. In group II, spinal anaesthesia was performed in 15 patients with 25 G Whitacre pencil-point-design spinal needles and, in group III, spinal anaesthesia was performed in 15 patients with 22 G Whitacre pencil-point-design spinal needles. In the pre- and on the first and the second day postoperatively, the pure tone audiogram was performed in the audiology laboratory of our hospital, using a calibrated Kamplex Diagnostic Audiometer AC 40 in a noise-free room. When the CSE anaesthesia group and 22 G spinal group were compared for change in hearing between the pre- and postoperative periods, a statistically significant difference was observed at R-right ear 125 Hz (P < 0.025) and at L-left ear 125 Hz (P < 0.023), and at L-left ear 1000 Hz (P < 0.036) and at R-right ear 1500 Hz (P < 0.006), and at L-left ear 1500 Hz (P < 0.022). At other frequencies, the difference was insignificant. When the CSE anaesthesia group and 25 G spinal group were compared for change in hearing between the pre- and postoperative periods, no statistically significant difference was detected at any frequency tested. When 22 G spinal group and 25 G spinal group were compared for change in hearing between the pre- and postoperative periods, there was some hearing loss at low frequency, although this difference did not reach statistical significance. The positive correlation of low-frequency hearing loss and increased pressure in the epidural space (which decrease the risk of cerebrospinal fluid leakage through the dura) suggests that cerebrospinal fluid leakage via the spinal puncture hole is not the only factor involved. Perioperative fluid replacement alone may not prevent hearing loss but CSF loss through the dural puncture site should also be prevented.

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“…The author has determined, by invasive technique, the quantitative relationship between changes in body position and ventricular fluid pressure (intracranial pressure) in normal subjects, using a chronically implanted telemetric pressure sensor. A comparison between this invasive technique and our noninvasive estimation, has been possible because on the normal subject the inner ear fluid pressure can be suddenly changed by the interaction between the intracranial and intralabyrinthine fluids in the normal labyrinth, consequently the inner ear can mirror the variation of the intracranial pressures [15]; adding also, without the normal condition, many other factors can disturb the regulation pressure of the inner ear, such as a change of ear canal [34], middle ear pressure [18] or injection of fluid [19]. Studies in guinea pigs have shown a relation between acute inner ear pressure changes and cochlear function at low-level DPOAE.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, the ICP varies with the posture change [12,13]. To achieve a new equilibrium state between the hydrodynamical interactions, a variation of the flow resistance (R A ) of the cochlear aqueduct has been linked to the perpetual state of flux [2,14,15]. The cochlear aqueduct would be a lowpass filter that should be able to transmit infrasonic waves (i.e., below of 20 Hz) from CSF to the cochlea [6].…”

Section: Introductionmentioning

confidence: 99%

The Estimation of the Time Constant of the Human Inner Ear Pressure Change by Noninvasive Technique

Traboulsi

Poumarat

Chazal

et al. 2009

Modelling and Simulation in Engineering

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We propose a noninvasive method to estimate the time constant. The calculation of this factor permits us to understand the pressure variations of the inner ear and also predict the behavior of the flow resistance of the cochlear aqueduct. A set of mathematical relationships incorporating the intralabyrinthine pressure, the intracranial pressure, and the time constant was applied. The modeling process describes the hydrodynamic effects of the cerebrospinal fluid in the intralabyrinthine fluid space, where the input and output of the created model are, respectively, the sinusoidal variation of the respiration signal and the distortion product of otoacoustic emissions. The obtained results were compared with those obtained by different invasive techniques. A long time constant was detected each time when the intracranial pressure increased; this phenomenon is related to the role of the cochlear aqueduct described elsewhere. The interpretation of this model has revealed the ability of these predictions to provide a greater precision for hydrodynamic variation of the inner ear, consequently the variation of the dynamic process of the cerebrospinal fluid.

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Hydromechanical interactions of the intracranial and intralabyrinthine fluids

Cited by 8 publications

References 17 publications

Quantifying the contribution of intracranial pressure and arterial blood pressure to spontaneous tympanic membrane displacement

Quantifying the contribution of intracranial pressure and arterial blood pressure to spontaneous tympanic membrane displacement

The effect of combined spinal-epidural (CSE) anaesthesia and size of spinal needle on postoperative hearing loss after elective caesarean section

The Estimation of the Time Constant of the Human Inner Ear Pressure Change by Noninvasive Technique

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