187 7 List of Abbreviations List of Abbreviations AC Air Conduction Baha® Bone Conduction Hearing Aid BAHD Bone Anchored Hearing Device BAHI Bone Anchored Hearing Implant BC Bone Conduction BCH Birmingham Children’s Hospital* BCHD Bone Conduction Hearing Device BHX Biohelix BMI Body Mass Index BWCH Birmingham Women’s and Children’s Hospital* CHL Conductive Hearing Loss CROS Contralateral Routing of Signals CSOM Chronic Suppurative Otitis Media CT Computed Tomography DS Down Syndrome GCBI Glasgow Children’s Benefit Inventory HARQ Hearing and Review Questionnaire ISQ Implant Stability Quotient ISQH Implant Stability Quotient High ISQL Implant Stability Quotient Low LAS Linear Analogue Scale MIPS Minimally Invasive Ponto surgery NICE National Institute of Clinical Excellence OME Otitis Media with Effusion PCD Primary Ciliary Dyskinesia PTA Pure Tone Audiometry PTA4 Pure Tone Average (average hearing threshold over 4 frequencies 500,1000,2000,4000 Hz) QOL Quality of Life RFA Resonance Frequency Analysis SA Spectacle Aid SD Standard Deviation SNHL Sensorineural Hearing Loss ST Scala Tympani SV Scala Vestibuli VORP Vibrating Ossicular Prothesis VSB Vibrant Soundbridge *Following an NHS trust merger in 2018/19 BCH became BWCH
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