Northern Territory Auditory Brainstem Response Peer Review Initiative: Strengthening Standards in Audiology

In the Northern Territory (NT) of Australia, where geographical isolation and accessibility to health care services present challenges, early detection of hearing loss is vital. Untreated hearing loss in infants can delay speech, language, and cognitive development, impacting education and social outcomes. Auditory Brainstem Response (ABR) testing is crucial for diagnosing hearing impairment in infants who cannot undergo behavioural tests, providing an objective assessment of auditory function.1Figure 1: Case Study 1 – Audiogram of hearing results from the initial assessmentFigure 2: Case Study 1 – ABR traces for 4kHz bone conduction from the initial assessmentFigure 3: Case Study 1 – Updated audiogram post peer review.Figure 4: Case Study 2 – Audiogram of hearing results from the initial assessment.Figure 5: Case Study 2 – ABR traces for 4kHz (left hand side) and 1kHz (right hand side) for the left ear from the initial assessment.Figure 6: Case Study 2 – ABR traces for 1kHz on the left from the first review appointment.Figure 7: Case Study 2 – Click ABR traces for the left ear from the first review appointment.Figure 8: Case Study 2 – ABR traces for 4kHz on the left from the first review appointment.Figure 9: Case Study 2 – ABR traces for 4kHz on the left from the second review appointment.Figure 10: Case Study 2 – ABR traces for 1kHz on the left from the second review appointment.Due to potential variability in ABR interpretation, a structured peer review system is essential for ensuring accuracy and consistency.2 This formal process, where ABR traces are reviewed by independent, skilled clinicians, addresses inter- and intra-variability. Based on standards from the British Society of Audiology (BSA) and best practices from programs like the Newborn Hearing Screening Programme (NHSP) in England, this system strengthens clinical governance and aligns with quality assurance principles.3,4 Studies, such as those in South London, have shown that systematic peer review can significantly improve ABR assessment quality.5 A structured peer review process and enhanced support systems are key to improving care consistency and quality across the NT. HISTORICAL CONTEXT The NT ABR Peer Review Group, established in 2014, is a collaborative network of audiologists specializing in ABR testing. Formed in response to the limited number of qualified clinicians and the NT’s low birth rate (around 3,200 births annually), the group aimed to ensure audiologists stay current in ABR testing.6 Initially, five audiologists recognized the need for peer review and developed a system for circulating ABR traces for feedback, using the BSA’s external peer review principles as a guide. This approach has improved ABR accuracy, consistency, and training capacity. Today, the group includes eleven trained audiologists, with more in training, reflecting its success in raising standards and promoting knowledge-sharing. Its primary goals of improving diagnostic accuracy and fostering professional support have been central to enhancing audiological care in the NT. Importance of Quality Control Peer review is critical in ensuring the quality and accuracy of ABR assessments, which are essential for diagnosing hearing impairments, particularly in infants and young children. ABR peer review allows multiple experienced audiologists to examine traces, offering diverse perspectives and insights. This process helps maintain high clinical standards by encouraging consistent interpretation and reducing variability between clinicians. Some common issues in ABR testing include:1,2 Inconsistent wave identification: Accurately identifying ABR wave peaks is essential for determining hearing thresholds, and misidentification can lead to errors in diagnosis. Artefact interference: Electrical or muscular noise can obscure ABR traces, making interpretation challenging. Ambiguous results: Factors like patient movement, -inadequate sedation, and abnormal morphology can cause unclear ABR traces, complicating interpretation. Peer review addresses these issues by offering collective expertise in identifying subtle waveforms, differentiating between artefacts and true responses, and deciding when retesting is necessary. Through group feedback, audiologists can correct potential errors and ensure more accurate, reliable results.3 Accurate ABR interpretation is crucial; errors can lead to significant consequences. Misdiagnosis may delay hearing interventions or lead to inappropriate treatments, such as unnecessary amplification devices or delayed referrals, adversely affecting children’s speech and language development. The peer review process reduces discrepancies in interpretation by promoting consistency across clinicians. Through ongoing collective assessment and discussion, reviewers identify trends, clarify uncertainties, and ensure that ABR interpretations align with best practices. This process improves ABR reporting accuracy, enhancing patient outcomes and quality of care.3–5 Peer Group Data The NT ABR Peer Review Group operates by emailing scanned traces and draft reports to a designated group of NT audiologists with experience in diagnostic ABR testing. Each submission includes traces, a report draft, relevant risk factors or case history, gestational age, and any factors that influenced the test. Group feedback, whether confirmatory or divergent, should be timely, constructive, and specific. Responses are expected within three working days to guide next steps, which may involve additional testing, report modifications, or further peer review to reach a consensus. Peer review by interstate experts may also be considered if consensus is not reached or local expertise does not suffice. The group focuses on key elements during their reviews: Trace quality: Evaluation of ABR waveforms to confirm identifiable peaks, such as Waves I, III, and V, are distinct and free from excessive noise or interference. Error rates: Identification of any potential misdiagnoses resulting from waveform misinterpretation, which could affect hearing threshold assessments or detection of hearing loss. Testing protocols: Assurance of adherence to best practices in ABR testing, such as environmental conditions, impedance, and patient preparation, which impact result quality. Reporting standards: Addressing variability in ABR report formats by checking for consistent waveform labelling, threshold estimation, and diagnostic conclusions to ensure standardisation. Management: The geographic spread of clients in the NT necessitate flexibility in management pathways. The ABR Peer Group will provide support to the testing clinician where results indicate review, and normal pathways cannot be achieved. Peer review data has shaped ABR testing best practices in the NT, driving refinements in protocols to address common issues like ambiguous waveforms and noise interference. Guidelines for sedation have been introduced to reduce artefacts, while targeted training for new audiologists focuses on common pitfalls and case management. Standardized reporting criteria have improved consistency, leading to more accurate ABR results, timely interventions, and better patient management. “The peer review process has been an excellent way of ensuring consistent and accurate diagnosis and management for the infants identified through Newborn Hearing Screening. Audiologists of all levels of experience learn from examining the results, and it also provides a forum for sharing ideas around troubleshooting and client management in this population of clients who bring unique challenges to settling to an appropriate response state.” – Senior Audiologist CASE STUDIES Case Study 1: Revised Diagnosis through Peer Review Initial Assessment Right Ear: Mild conductive hearing loss at 1 kHz and 4 kHz, with evidence of middle ear pathology (non-peaked response using 1,000 Hz tympanometry). Left Ear: Mild conductive hearing loss at 4 kHz and normal hearing at 1 kHz, with normal middle ear function (peaked response using 1,000 Hz tympanometry). Management Plan: Referrals were made to ENT, Hearing Australia, and a Paediatrician to investigate the unusual presentation of a conductive hearing loss in the left ear, despite normal middle ear function. Findings from peer review 4 kHz bone conduction ABR traces for the right ear lacked clear responses due to the absence of testing at higher intensities; therefore, the small amplitude of the original marked Wave V was deemed unreliable and not considered a clear response (Figure 2). Impact of peer review The updated interpretation indicated (Figure 3) limited scope for intervention by medical specialists or Hearing Australia based on the revised findings. The diagnosis and management plan were adjusted accordingly, ensuring appropriate follow-up care while avoiding unnecessary interventions. Case Study 2: Iterative Diagnosis with Peer Review at Multiple Stages Initial Assessment Right Ear: Inconclusive results. Left Ear: Normal hearing at 1 kHz and 4 kHz. Management Plan: A review appointment was scheduled to address the inconclusive findings for the right ear. Findings from peer review (initial assessment) ABR traces for the left ear displayed atypical morphology. A clamped trace would have been valuable to rule out -artefacts and confirm the validity of the observed responses. First Review Appointment Right Ear: Normal hearing confirmed at 1 kHz and 4 kHz. Left Ear: Abnormal morphology persisted, with no change in amplitude or latency evident in the ABR traces. A clamped trace (0dBnHL) had similar results to a trace presented at 60dBnHL. Management Plan: Referrals to ENT and a Paediatrician were discussed. Findings from peer review (first review appointment) ABR testing for the left ear revealed clear Wave I, III, and V responses to clicks at 85 dBnHL and a decrease in amplitude and increase in latency with decreased intensity. Morphology in the left ear showed improvement, with latency shifts observed at 4 kHz, suggesting possible maturation effects. Adjustments were made to the management plan, including a review appointment being required. Referrals to the ENT, paediatrician, and Hearing Australia are still to proceed. Second review appointment Left Ear: ABR responses at 4 kHz were clearer but became unclear at 20 dBnHL. Responses at 1 kHz remained unclear. Management Plan: An ENT consultation was scheduled, and a VROA (Visual Reinforcement Orientation Audiometry) assessment was arranged for nine months of age. -Referral to Hearing Australia was deemed unnecessary due to sufficient clarity in the results. Findings from peer review (second review appointment) Peer reviewers confirmed agreement with the interpretation of results. The follow-up plan was adjusted to conduct a review post-ENT consultation rather than waiting until the child was nine months old. Impact of peer review The updated interpretation indicated abnormal morphology on the left, instead of normal hearing at 1 and 4kHz. The diagnosis and management plan were adjusted accordingly, ensuring appropriate follow-up care and that the patient was referred to appropriate professions. These case studies underscore the vital role of peer review in enhancing the accuracy and reliability of audiological assessments. Peer review facilitated the identification of diagnostic discrepancies, leading to tailored management plans and informed clinical decisions. Through collaborative evaluation, the quality of care was optimized, ensuring appropriate interventions and follow-up for the patients. Learning Support Initiatives The NT ABR Peer Review Group has developed initiatives to enhance audiologists’ skills across the region. In 2018, the ABR Competency Program was introduced, providing a structured process for training in ABR. It covers both theoretical knowledge and practical skills for performing and interpreting ABR tests, as well as working with families of newborns being assessed for hearing loss. A flexible logbook tracks progress, allowing for adjustments based on individual needs, especially for clinicians who travel regularly. The program, including the peer review process, remains central to training in public NT hearing agencies. Trainees submit and review clinical cases to meet competency requirements. In 2023–24, the group encouraged completion of the Interacoustics Clinical Diploma in Newborn Hearing Assessment.7 This program, alongside the competency package and logbook, provided structured training with clear benchmarks for newer staff and supported skill progression. Feedback has been positive, with audiologists reporting greater confidence and accuracy in ABR assessments. The formal training has also strengthened the peer review process, as audiologists now share a common training base for feedback. The programs help newer audiologists track their development while offering experienced clinicians’ opportunities for review and updates. Additionally, resources aligned with the British Society of Audiology (BSA) Guidelines and an enhanced peer review process ensure continual learning and knowledge exchange. CHALLENGES FACED The NT ABR Peer Review Group has faced challenges due to the small number of audiologists performing ABR testing and the limited number of babies requiring testing each year. This made it difficult for clinicians to gain enough hands-on experience to reach and maintain competency. Initially, training was limited by the number of babies born, leading to a small pool of trained audiologists, most of whom were trained by a single clinician. As a result, some clinicians lacked confidence in responding to peer review cases. In 2021, clinicians deemed competent in ABR were also deemed qualified to train new staff. This, along with improved peer review turnaround times and a minimum response requirement per case, has boosted audiologists’ confidence in providing feedback on colleagues’ cases. The peer review process ensures that all audiologists are involved in testing across the NT, maintaining their experience and familiarity with ABR, even if they have limited hands-on practice. FUTURE DIRECTIONS Looking ahead, the NT ABR Peer Review Group envisions several initiatives to increase participation and expand peer review scope. One proposal is blind inter-jurisdictional reviews to facilitate knowledge exchange beyond the NT. The group also plans to refine its peer review process with comprehensive guidelines, checklists, and cover pages, establishing standardized parameters for analysis and interpretation. Additionally, incorporating peer review evidence directly into client files could improve documentation and build health care providers’ confidence in ABR results. As technological advancements in ABR testing emerge, the group aims to remain adaptable through ongoing professional development and exploring national network options for knowledge sharing. Future advancements in artificial -intelligence (AI) and machine learning could enhance the ABR peer review process by automating trace analysis, identifying subtle patterns, and providing real-time feedback, ultimately improving consistency and efficiency through standardizing assessments, highlighting discrepancies and providing support to clinicians. Integrating these technologies and establishing broader peer review networks could help reduce isolation among NT audiologists and foster innovation, ultimately benefiting patients in diverse and remote settings. CONCLUSION The NT ABR Peer Review Group underscores the importance of structured peer review and collaborative learning to enhance ABR assessment quality. Through proactive professional development, structured protocols, and peer review, the group has strengthened audiological care in the NT, despite resource limitations. Challenges remain, including the need for broader participation, greater access to professional development, and consistent training standards. Moving forward, the group is committed to refining its processes and exploring regional peer review networks to ensure all audiologists, regardless of location, have the support and resources to interpret ABR results accurately. These initiatives position the NT ABR Peer Review Group to continue improving audiological outcomes across the region.

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