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New SMS Classification of Cochleovestibular Anomalies: Our Experience with 25 Cases of Type I Anomaly

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Indian Journal of Otolaryngology and Head & Neck Surgery Aims and scope Submit manuscript

Abstract

Purpose

To study and analyse the radiological and surgical findings of 25 cochlear implantees with SMS type—I cochleovestibular malformation and to compare their outcomes in terms of hearing and speech gains pre- and post-operatively.

Methods

Retrospective analysis of cochlear implanted candidates over a period of 8 year from 3 institutions was undertaken and 25 patients suffering from pre-lingual profound congenital sensori-neural hearing loss along with presence of SMS type I cochleovestibular malformation were studied. Pre-operative radiology, surgical difficulties and complication, and post-operative hearing and speech outcomes upto a period of 2 years, using IT-MAIS scores were noted. Statistical comparison pre- and post-implantation was done using Wilcoxon signed rank test and a p-value of < 0.05 was considered significant.

Results

In 25 cases, we encountered 2 posterior SCC dysplasia, 15 enlarged vestibular aqueducts (LVA), 2 dilated vestibules, 4 superior SCC dysplasia, 2 cases with both posterior and superior SCC dysplasia and of those 1 had a dilated vestibule also. Intra-operatively, CSF leak was observed in 10 patients. Complete electrode insertion and good electrical response (NRT) was detected in all. No facial nerve anomaly was encountered. IT-MAIS scores increased from a pre-operative mean of 4.32 to 34.56 two years post-operatively and this difference was found to be statistically significant.

Conclusion

Our experience with SMS Type I malformations show promising and motivating results with less chances of complications, similar to implant candidates with normal anatomy. The outcomes in this group of patients are definitely not affected by any malformations in semicircular canals, vestibule or vestibular aqueduct.

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Authors and Affiliations

  1. Department of Otorhinolaryngology and Head Neck Surgery, S.M.S Medical College and Hospital, Jaipur, Rajasthan, 302004, India

    Mohnish Grover, Shivam Sharma, Sunil Samdani & Mahendra Kumar Hada

  2. Department of Otorhinolaryngology and Head Neck Surgery, S.P Medical College and Hospital, Bikaner, Rajasthan, India

    Gaurav Gupta

  3. Department of Otorhinolaryngology and Head Neck Surgery, All India Institute of Medical Sciences, Bhubaneswar, Orissa, India

    Chappati Preetam

  4. S.M.S Medical College and Hospital, Jaipur, Rajasthan, 302004, India

    Kriti Gera

  5. Department of Otorhinolaryngology and Head Neck Surgery, RVRS Medical College and Hospital, Bhilwara, Rajasthan, India

    Jairaj Kumar Vaishnav

Authors
  1. Mohnish Grover
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  2. Shivam Sharma
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  3. Sunil Samdani
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  4. Gaurav Gupta
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  5. Chappati Preetam
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  6. Kriti Gera
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  7. Jairaj Kumar Vaishnav
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  8. Mahendra Kumar Hada
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Corresponding author

Correspondence to Shivam Sharma.

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Conflict of Interest

All Authors declare that they have no conflict of Interest. This research did not receive any specific grant from funding agencies in the public, commercial, or not for profit sectors.

Ethical Approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

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Informed consent was obtained from all individual participants included in the study..

Author Contributions Statement

All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by Mohnish Grover and Shivam Sharma. The first draft of the manuscript was written by Shivam Sharma and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Grover, M., Sharma, S., Samdani, S. et al. New SMS Classification of Cochleovestibular Anomalies: Our Experience with 25 Cases of Type I Anomaly. Indian J Otolaryngol Head Neck Surg 73, 333–339 (2021). https://doi.org/10.1007/s12070-021-02442-x

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  • DOI: https://doi.org/10.1007/s12070-021-02442-x

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