Outcomes of Bone Anchored Hearing Aid Implant at Universiti Kebangsaan Malaysia Medical Centre (UKMMC).

Abstract

The cross sectional study was conducted in Universiti Kebangsaan Malaysia Medical Center (UKMMC), Malaysia from August 2012 to December 2013. All patients implanted with in UKMMC from December 2001 until December 2012 was included. Glasgow Benefit Inventory (GBI) questionnaires and UKMMC questionnaires were used as part of the assessment tool. The GBI is a scoring which measures the change in health status produced by surgical interventions. UKMMC questionnaires was invented by our department to assess questions related to social and life style of patients and also the cosmetic perspective Baha implant and other daily related activities. The audiological assessment was assessed using hearing aid gain threshold. Complication with regards to skin reaction was graded using Holger Skin Classification. A total of 40 patients underwent Baha implant were recruited but only 35 patients fulfilled the criteria and included in this study for analysis. Age of patients ranged from 5year old to 38year old, with median of 13years old. There were 22 patients (62.8%) were male and 13 patients (37.1%) were females. Almost all cases were canal atresia except one adult patient was a case of bilateral chronic discharging ear with chronic irritation with ear mould. Majority of patients 21 (60%) have hearing level of moderate to severe hearing loss (40-89dB) and 14 patients (40%) have mild to moderate hearing loss (20-39dB). The level of hearing was retested post operatively. All of the patients have improvement in their aided hearing with the range of 10-25dBL which is statistically significant at p value of <0.05. The GBI was scored positively in all subscales. Majority of patients (91.4%) used BAHA more than 4h per day and 88.6% agreed that BAHA is cosmetically acceptable. All patients experienced some form of skin irritation (Holger grade 1-2) however only 20% required surgical intervention. All our patients have range of 10-25dB improvement of their aided hearing which is statistically significant at p value of <0.05. BAHA has been proven to show significant benefit in audiological improvement and quality of life.