• Users Online: 706
  • Home
  • Print this page
  • Email this page
Home About us Editorial board Search Ahead of print Current issue Archives Submit article Instructions Subscribe Contacts Login 
ORIGINAL ARTICLE
Year : 2015  |  Volume : 31  |  Issue : 3  |  Page : 149-155

Difficult cochleostomy in the normal cochlea


Department of Otorhinolaryngology, King Abdulaziz University Hospital, College of Medicine, King Saud University, Riyadh, Saudi Arabia

Correspondence Address:
Hazem Y Abdelwahed
Senior Registrar of ORL-H&N Surgery, Department of Otorhinolaryngology-Head & Neck Surgery, King Abdulaziz University Hospital, College of Medicine, King Saud University, Airport Road, PO Box 245, Riyadh 11411
Saudi Arabia
Login to access the Email id

Source of Support: None, Conflict of Interest: None


DOI: 10.4103/1012-5574.159791

Rights and Permissions

Background The concept that the morphological and the spatial orientation of the labyrinth does not change postnatally is undergoing a worldwide discussion by cochlear implant surgeons. The main objective of this study was to examine the basal turn angulation of the cochlea relative to the midsagittal line to find a possible relationship with the difficulty in implanting the normal cochlea. Participants and methods A retroprospective descriptive study was conducted on two equal groups, each consisting of six cochlear implantees. All patients of both groups were having bilateral profound sensorineural hearing loss with normal patent cochlea. The basal turn angle (BTA) of the cochlea relative to the midsagittal plane was measured using the preoperative axial view of the computed tomography (CT) imaging. Results A retrospective study was performed on the first group of six cochlea implantees without difficult cochleostomy as noted in the operative notes and correlated with the postoperative BTAs (range = 55-60°) measured later, using patients' preoperative CT images, which were within the normal range. A blind prospective study was performed on the second group of six patients undergoing cochlear implantation in which difficult cochleostomy was faced intraoperatively in one patient (number 2), whose preoperatively measured BTA was 65° (i.e. more obtuse than the normal range), predicting a rotated cochlea with difficult cochleostomy, which was actually faced intraoperatively. BTAs of other five implantees in this group (55, 62, 50, 56, and 57°, respectively) were within the same range as our first group, predicting no difficulty, and this was also found intraoperatively. Conclusion Our results were comparable to those of the three pediatric cochlear implantees reported with difficult cochleostomy in whom the BTAs were more obtuse than normal, indicating a rotated cochlea. The possibility of a rotated cochlea should be borne in mind when difficult cochleostomy is encountered. Measuring the BTA of the cochlea relative to the midsagittal plane in all preoperative CT scans is advised to identify cases in which the basal turn of the cochlea may have an unusual orientation. Scala vestibuli insertion or a combined approach technique in case of encountered difficult cochleostomy is highly recommended.


[FULL TEXT] [PDF]*
Print this article     Email this article
 Next article
 Previous article
 Table of Contents

 Similar in PUBMED
   Search Pubmed for
   Search in Google Scholar for
 Related articles
 Citation Manager
 Access Statistics
 Reader Comments
 Email Alert *
 Add to My List *
 * Requires registration (Free)
 

 Article Access Statistics
    Viewed1863    
    Printed37    
    Emailed13    
    PDF Downloaded217    
    Comments [Add]    

Recommend this journal