Effect of Round Window Reinforcement on Hearing

Wegner, Inge; Eldaebes, Mostafa M A S; Landry, Thomas; Adamson, Robert; Grolman, Wilko; Bance, Manohar

doi:10.1097/mao.0000000000001023

Cited by 11 publications

(10 citation statements)

References 15 publications

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“…As we have confirmed by experiments (cf. Appendix A), and as is also reported in the literature [5,13], the input to the cochlea can be assumed to not be affected by the RWM reinforcement-i.e., U STAP = U' STAP , where the apostrophe denotes the conditions after RWM reinforcement. The model further assumes equal RWM motion before and after reinforcement (U RWM = U' RWM ).…”

Section: Comparison With Numerical Calculations and Rwm Impedance Estimationmentioning

confidence: 87%

“…In general, only the effect of the RWM reinforcement on the ICSP was investigated in the present study. However, in samples HTB-11, HTB-12, and HTB-20, V STAP was additionally recorded after RWM reinforcement to verify its effect on the METF and for comparison with Wegner et al (2016) research findings (Appendix A).…”

Section: Reinforcement Of Rwmmentioning

confidence: 99%

“…RWM reinforcement techniques for clinical applications have received attention for more than two decades [3]. Artificially reinforced RWMs are claimed to provide better hearing for patients suffering from diseases such as superior semicircular canal dehiscence, hyperacusis [4], and perilymphatic fistula [5]. The main materials used in clinical applications for RWM reinforcement are perichondrium, cartilage, and fascia [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…The study involved cadaveric human temporal bones (HTBs) and RWM reinforcement with perichondrium and cartilage. A drop in METF with RWM reinforcement was attributed to the dominance of the cochlear input impedance in RWM stiffness at lower frequencies [5,11,12]. However, the authors concluded that the reinforcement of the RWM had no statistically significant effect on the METF.…”

Section: Introductionmentioning

confidence: 99%

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Round Window Reinforcement-Induced Changes in Intracochlear Sound Pressure

et al. 2021

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Introduction: The round window membrane (RWM) acts as a pressure-relieving membrane for incompressible cochlear fluid. The reinforcement of the RWM has been used as a surgical intervention for the treatment of superior semicircular canal dehiscence and hyperacusis. The aim of this study was to investigate how RWM reinforcement affects sound pressure variations in the cochlea. Methods: The intracochlear sound pressure (ICSP) was simultaneously measured in the scala tympani (ST) and scala vestibuli (SV) of cadaveric human temporal bones (HTBs) in response to acoustic stimulation for three RWM reinforcement materials (soft tissue, cartilage, and medical-grade silicone). Results: The ICSP in the ST was significantly increased after RWM reinforcement for frequencies below 2 kHz. Between 400 and 600 Hz, all three materials demonstrated the highest median pressure increase. The higher the RWM stiffness, the larger the pressure increase: silicone (7 dB) < soft tissue (10 dB) < cartilage (13 dB). The ICSP in the SV was less affected by reinforcement. The highest median pressure increase was 3 dB. The experimental findings can be explained with numerical models of cochlear mechanics. Discussion and conclusions: RWM reinforcement increases the sound pressure in ST at lower frequencies but only has a minor influence on the SV pressure.

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Section: Comparison With Numerical Calculations and Rwm Impedance Estimationmentioning

confidence: 87%

Section: Reinforcement Of Rwmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Round Window Reinforcement-Induced Changes in Intracochlear Sound Pressure

et al. 2021

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“…55,56 Alternatively, the round window can be targeted; surgeons may reinforce the round window with overlying tissue (eg, fascia, cartilage, fat) or occlude the round window niche (Fig 12). 55,[57][58][59][60] Currently, most authors favor the former approach over the latter; although round window occlusion is considered low-risk, this strategy may induce conductive hearing loss. Furthermore, the theoretic physiologic justification for this approach is lacking because occlusion of the round window should theoretically create preferential shunting toward the pathologic third window.…”

Section: Surgical Considerationsmentioning

confidence: 99%

The Forgotten Second Window: A Pictorial Review of Round Window Pathologies

Benson

Diehn

Passe

et al. 2019

AJNR Am J Neuroradiol

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The round window serves to decompress acoustic energy that enters the cochlea via stapes movement against the oval window. Any inward motion of the oval window via stapes vibration leads to outward motion of the round window. Occlusion of the round window is a cause of conductive hearing loss because it increases the resistance to sound energy and consequently dampens energy propagation. Because the round window niche is not adequately evaluated by otoscopy and may be incompletely exposed during an operation, otologic surgeons may not always correctly identify associated pathology. Thus, radiologists play an essential role in the identification and classification of diseases affecting the round window. The purpose of this review is to highlight the developmental, acquired, neoplastic, and iatrogenic range of pathologies that can be encountered in round window dysfunction. ABBREVIATIONS: LO 4 labyrinthitis ossificans; RW 4 round windowIndicates open access to non-subscribers at www.ajnr.org http://dx.

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