A Study of Round Window and its Adjacent Anatomy to Guide the Cochlear Implant Electrode Insertion.
- Resource Type
- Article
- Authors
- Kataria, Tanmaya; Sharma, Shitanshu; Lakhawat, Rajendra Singh; Grover, Mohnish; Sharma, Shivam; Kanodia, Anupam; Agarwal, Srishti; Samdani, Sunil
- Source
- Indian Journal of Otolaryngology & Head & Neck Surgery. Apr2023 Suppl 1, Vol. 75, p163-169. 7p.
- Subject
- *ACOUSTIC stimulation
*COCHLEAR implants
*TEMPORAL bone
*ANATOMICAL variation
*ANATOMY
*INNER ear
*HOSPITAL rounds
*EAR
*COCHLEAR nucleus
- Language
- ISSN
- 2231-3796
Introduction: Residual hearing preservation has gained attention now which has brought round window membrane into the light, as a port for cochlear implantation. Atraumatic insertion of electrodes can be achieved by study of anatomical variations of round window and its forms which can guide the surgeon. Objective: This study was undertaken to examine the anatomical variations of round window and its adjacent structures and their impact on surgical approach during cochlear implantation. Methods: A series of 40 adult human temporal bones underwent high-resolution CT scanning and were further dissected for microscopic study of the round window. Results: The antero posterior dimensions of RW ranged from 1.22 to 2.51 mm on radiology and on dissection 1.76 mm +/- 0.3 mm. Shape of round window in 72.5% of bones was oval, and in 27.5% bones it was round shaped. As per Saint Thomas hospital classification for Round window visualization we found 82.5% bones had type I RW visualization and 17.5% had type IIa RW visualization. Area of crista fenestra on dissection was ranging from 0.41 to 0.69 mm2. Conclusion: Residual hearing preservation has become a new motto for surgeons. Therefore thorough anatomic knowledge of round window is must for careful insertion, as round window is closely related to the sensitive inner ear structures. [ABSTRACT FROM AUTHOR]