Variations of chorda tympani nerve in endoscopic stapes surgery

Articles in Press

Document Type : Original Article

Authors

1 lecturer of otorhinolaryngology faculty of medicine Minia university

2 Department of Otolaryngology, Minia faculty of Medicine at Minia University, Minia, Egypt

3 professor of otorhinolaryngology Faculty of medicine- Minia university

4 lecturer of Audiovestibular medicine , Faculty of medicine- Minia university

5 Otorhinolaryngology-Faculty of medicine-Minia university ,Minia

6 Lecturer of otorhinolaryngology-Faculty of medicine-Minia university

Abstract

Objective: To reveal the factors affecting the incidence of chorda tympani nerve )CTN) transection during middle ear surgery.

Study Design: Prospective case review.

Setting: Tertiary referral center.

Patients: We analyzed 20 ears with otosclerosis that underwent stapes surgery during 2022-2023

Main Outcome Measure: To confirm CTN transection, intraoperative endoscopic video.

We used the same video images to determine the anatomical variation of the CTN course in the middle ear and determine types of chord tympani.

Results:

25% 5 cases type1 of chorda

65% 13 cases type2

10% 2 cases type3

CTN anatomical variants such as the “Attached Short type” and “Ultrashort type” showed a significantly higher CTN transection incidence

Conclusion:

Endoscopic ear surgery provides improved visibility, reduces the necessity for significant manipulation of the chorda tympani, and subsequently lowers the occurrence of CTN injury.

Performing a preoperative assessment to determine the extent of stapes involvement and the anatomical position of the CTN course could assist in identifying patients who are at a higher risk of experiencing iatrogenic CTN transection.

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Minia Journal of Medical Research

Articles in Press, Accepted Manuscript
Available Online from 07 October 2024

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