Five year clinical outcomes and evaluation of the Oticon 4.5mm 41 2 2.3. Post-operative care Post-operative dressings were standardised for all children. Both surgeons used a porous semi-transparent, low adherent wound contact layer around the abutment. This is a flexible polyamide net which is coated with soft silicone (Mepitel) which was left over the wound for the 7 days post-operative period and held in place with a healing cap. A head bandage was routine for the first 24hrs. Routine follow up occurred at 1-2 weeks, 3, 6, 9, 12 months and yearly thereafter. 2.4. Statistical analysis Data was recorded using Microsoft Excel (Redmond, WA, USA). Categorical data is reported as frequencies, and continuous data is reported with means, standard deviations, and ranges. Comparison of groups was undertaken by unpaired t-test and significance set at 0.01. 3. Results 3.1. Patient characteristics A total of 47 children underwent BAHI implantation (BAHI) with the Oticon™ wide implant between January 2014 and December 2015. Twenty-three children (49%) were implanted bilaterally and 24 unilaterally giving a total of 70 implant systems to evaluate. The mean age at first stage procedure was 9yrs 6 months (SD 0.5, range 4yr-16yr 3months) on 27 males (57%) and 20 females. It was found that congenital and acquired hearing loss predispose to the requirement for BAHI in 66% and 34% of patients, respectively. The most common indication for BAHI surgery was a congenital conductive hearing loss n = 29 (62%). 2% (n = 2) were due to either a congenital sensorineural or mixed hearing loss. Acquired conductive loss accounted for 30% (n = 30) and sensorineural 4% (n = 2). [Table 1]. Twenty-nine children (62%) had a significant associated medical co-morbidity or syndromes [Table 2].
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