TY - JOUR T1 - Sensorineural Hearing Loss Rate AMONG Patients Reffering to Khalili Hospital in Shiraz TT - میزان تغیرات شنوایی حسی - عصبی به دنبال برداشتن استخوان ماستوئید در بیماران مراجعه‌کننده به بیمارستان خلیلی شیراز JF - RUMS_JOURNAL JO - RUMS_JOURNAL VL - 8 IS - 2 UR - http://journal.rums.ac.ir/article-1-590-en.html Y1 - 2009 SP - 109 EP - 116 KW - Mastoidectomy KW - Acoustic trauma KW - Sensorineural Hearing Loss N2 -   Sensorineural Hearing Loss Rate AMONG Patients Reffering to Khalili Hospital in Shiraz   Â  M. Shishegar [1] , A.H. Faramarzi [2] , M.H. Sahebi Bazzaz [3]   Â  Received: 07/10/07 Sent for Revision: 21/04/08 Received Revised Manuscript: 09/04/21 Accepted: 30/04/09   Â  Background and Objectives: Sensory – neural hearing loss following mastoid surgery has been Reported with different severities. In the mastoid surgery, different factors can affect hearing. The aim of this study was to introduce the most common frequency that was affected during mastoid surgery and also to determine the correlation between duration of drilling and suction irrigation with the severity of sensory – neural hearing loss.   Materials and Methods: Th is Longitudinal Study was performed in the E.N.T department of Khalili Hopistal-Shiraz University of Medical Sciences. Thirty consecutive patients with chronic otitis media were selected. Audiometry was done (250Hz – 8kHz) in two occassions, one day before the operation and 2 months after the operation. The results were analyzed using paired T- test and Pearson Correlation.   Results: There was not any significant change in threshold of bone conduction in all frequencies (250HZ-8KHZ) after 2 months. The average time of drilling, was 46.6 minutes (SD 8.77). There was a significant correlation between the time of drilling, suction, irrigation and change in bone conduction threshold in the 4KHZ, (p M3 ER -