Audio-Vestibular Evaluation of Pediatric Pseudo-Conductive Hearing Loss: Third Window Syndromes
Gorkem Ertugrul1, Aycan Comert1, Aysenur Aykul Yagcioglu2
1Department of Audiology, Faculty of Health Sciences, Hacettepe University, 06230 Ankara, Turkey.
Insights
Pseudo-conductive hearing loss (PCHL) in children can be misdiagnosed. Early identification of third window syndromes (TWSs) is crucial for accurate diagnosis and management of pediatric hearing loss.
Area of Science:
- Otolaryngology
- Audiology
- Pediatrics
Background:
- Conductive hearing loss (CHL) in children, often due to otitis media or cerumen, affects sound wave transmission.
- Normal external and middle ear structures may coexist with an audiogram air-bone gap, indicating potential misdiagnosis.
- Pseudo-conductive hearing loss (PCHL) arises from third window syndromes (TWSs), including semicircular canal dehiscence and perilymphatic fistula.
Purpose of the Study:
- To review the literature on pediatric audio-vestibular evaluation for third window syndromes (TWSs).
- To highlight diagnostic pitfalls in identifying TWSs in pediatric patients.
- To provide guidance for the early and accurate differential diagnosis of PCHL caused by TWSs.
Main Methods:
- Comprehensive literature review focusing on pediatric audio-vestibular assessments.
- Analysis of diagnostic challenges and key evaluation aspects for TWSs.
- Synthesis of information for audiologists and otologists.
Main Results:
- Pediatric audio-vestibular evaluations present unique challenges for TWS diagnosis.
- Specific evaluation strategies are essential for differentiating PCHL caused by TWSs.
- Early identification of TWSs is often missed in pediatric populations.
Conclusions:
- Accurate diagnosis of PCHL in children requires careful consideration of TWSs.
- Enhanced audio-vestibular evaluation protocols are needed for TWS detection.
- This review offers guidance for improved early diagnosis of TWSs in pediatric patients.
Abstract:
Conductive hearing loss caused by external or middle ear problems prevents the transmission of sound waves from the external auditory canal to the cochlea, and it is a common condition, especially in pediatric patients aged 1-5 years. The most common etiological factors are otitis media and cerumen during childhood. In some patients, external and middle ear functions and structures may be normal bilaterally despite the air-bone gap on the audiogram. This condition, which is often a missed diagnosis in children, is defined as a pseudo-conductive hearing loss (PCHL) caused by third window syndromes (TWSs) such as semicircular canal dehiscence, inner ear malformations with third window effect, and perilymphatic fistula. In this review of the literature, the authors emphasize the pitfalls of pediatric audio-vestibular evaluation on TWSs as well as the key aspects of this evaluation for the differential diagnosis of PCHL brought on by TWSs. This literature review will provide audiologists and otologists with early diagnostic guidance for TWSs in pediatric patients.
