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<p>To determine normative values and reference ranges for cochlear size measurements in Western Indian population. This retrospective, observational study conducted at a cochlear implant centre and tertiary-care hospital in Pune, Western India; included 195 otology patients (111 males and 84 females) with normal-appearing cochleae on high resolution computed tomography (HRCT) temporal bone. Cochlear distance A was measured on HRCT images and cochlear duct length (CDL) was calculated using the formula, CDL = 4.16&#xa0;A−3.98. Overall mean measurement A for both ears was 8.41&#xa0;mm (range 7.25–9.85&#xa0;mm). Mean complete CDL was 31.01&#xa0;mm (range 26.18–37.00&#xa0;mm). Female patients recorded smaller mean A and CDL values. Smaller cochlear dimensions observed in this Western Indian cohort as compared to those reported in Caucasian and other Asian sub-groups, underscore ethnic variability found in cochlear sizes. Normative data from this study will facilitate selection of appropriate cochlear implant electrodes in the Indian settings.</p>

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Measurement of Cochlear Size: A Normative Study at a Tertiary Care Hospital in Western India

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Neelam Vaid,
  • Sanjay Vaid,
  • Shubhangi Avhad,
  • Aparna Chandorkar

摘要

To determine normative values and reference ranges for cochlear size measurements in Western Indian population. This retrospective, observational study conducted at a cochlear implant centre and tertiary-care hospital in Pune, Western India; included 195 otology patients (111 males and 84 females) with normal-appearing cochleae on high resolution computed tomography (HRCT) temporal bone. Cochlear distance A was measured on HRCT images and cochlear duct length (CDL) was calculated using the formula, CDL = 4.16 A−3.98. Overall mean measurement A for both ears was 8.41 mm (range 7.25–9.85 mm). Mean complete CDL was 31.01 mm (range 26.18–37.00 mm). Female patients recorded smaller mean A and CDL values. Smaller cochlear dimensions observed in this Western Indian cohort as compared to those reported in Caucasian and other Asian sub-groups, underscore ethnic variability found in cochlear sizes. Normative data from this study will facilitate selection of appropriate cochlear implant electrodes in the Indian settings.