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The latest medical research on Audiology

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Demographic Disparities in Drive Times to the Nearest Audiologist in the United States.

Am J Audiology

Audiological services are underused, possibly because patients need to drive long distances to see a provider. In this study, we measured the association of drive times to the nearest audiologist with population density, income, ethnicity, race, and distance to the nearest audiology graduate program.

Drive times for each census block group to the nearest audiologist were measured using census data, the National Provider Identifier Registry, and a geographic analyzing tool called ArcGIS for all block groups within the United States. The association between drive times and population density, income, ethnicity, race, and audiology program distance was evaluated with a population density-matched case-control study and multiple linear regression analyses.

Approximately 5.29 million Americans need to drive at least 1 hr to visit their closest audiologist. The 10% most rural-dwelling Americans drive an average of 33.8 min. The population density-matched case-control study demonstrated that percent below poverty, percent identifying as Hispanic, and travel times to the nearest audiology program were all significantly higher in census block groups with high drive times to the nearest audiologist. An average of 7.96% of individuals in census block groups with low drive times identified as Hispanic, but 18.8% identified as Hispanic in high drive time groups. The multiple linear regression showed that the effect of demographics and distance to the nearest audiology program was highest in rural areas. In both analyses, adjusting for poverty did not drastically change the effect of percent identifying as Hispanic on drive times.

Long drive times restrict access to audiological care for those who live in rural areas. This restriction disproportionately affects those in rural areas who identify as Hispanic or have low income.

Experienced Adult Cochlear Implant Users Show Improved Speech Recognition When Target Fitting Parameters Are Applied.

Ear and Hearing

The aim of the present study was to investigate whether prediction models built by de Graaff et al. (2020) can be used to improve speech recognition in experienced adult postlingual implanted Cochlear CI users. de Graaff et al. (2020) found relationships between elevated aided thresholds and a not optimal electrical dynamic range (<50 CL or >60 CL), and poorer speech recognition in quiet and in noise. The primary hypothesis of the present study was that speech recognition improves both in quiet and in noise when the sound processor is refitted to match targets derived from the prediction models from de Graaff et al. (2020). A second hypothesis was that subjectively, most of the CI users would find the new setting too loud because of an increase in C levels, and therefore, prefer the old settings.

A within-participant repeated measures design with 18 adult Cochlear CI users was used. T- and C-levels were changed to "optimized settings," as predicted by the model of de Graaff et al. (2020). Aided thresholds, speech recognition in quiet, and speech recognition in noise were measured with the old settings and after a 4-week acclimatization period with the optimized settings. Subjective benefit was measured using the Device Oriented Subjective Outcome Scale questionnaire.

The mean electrical dynamic range changed from 41.1 (SD = 6.6) CL to 48.6 (SD = 3.0) CL. No significant change in aided thresholds was measured. Speech recognition improved for 16 out of 18 participants and remained stable for 2 participants. Average speech recognition scores in quiet significantly improved by 4.9% (SD = 3.8%). No significant change for speech recognition in noise was found. A significant improvement in subjective benefit was found for one of the Device Oriented Subjective Outcome subscales (speech cues) between the old and optimized settings. All participants chose to keep the optimized settings at the end of the study.

We were able to improve speech recognition in quiet by optimizing the electrical dynamic range of experienced adult CI users, according to the prediction models built by de Graaff et al. (2020). There was no significant change in aided thresholds nor in speech recognition in noise. The findings of the present study suggest that improved performance for speech recognition in quiet in adult Cochlear CI users can be achieved by setting the dynamic range as close as possible to values between 50 and 60 CL when the volume level is at 10.

The Perspectives of Haitian Parents on Heritage Language Maintenance.

Speech Language Path

The study sought to understand Haitian parents' perspectives on heritage language maintenance with typically developing children.

Semistructured interviews were conducted with 10 Haitian parents of typically developing children. A thematic analysis was conducted to determine recurring themes.

Participants desired to preserve the heritage language; however, factors such as linguistic and class ideologies of Haiti, xenophobia within the United States, and English monolingualism hindered parents' success in maintaining the heritage language.

The findings from this study demonstrate the need for additional research and resources to help support the Haitian community's desire for heritage language maintenance to promote healthy communication practices, decrease language loss, and foster social communication in the home and community.

A Goal-Writing Framework for Motor-Based Intervention for Childhood Apraxia of Speech.

Speech Language Path

There are multiple frameworks for goal writing that are applicable to the practice of speech-language pathology. Motor-based speech disorders are a subset of speech sound disorders that are thought to require specific elements of intervention that are typically not addressed in the traditional frameworks used in the clinical setting. The purpose of this tutorial is to review general approaches of goal writing and suggest additional elements that may be used to improve the efficiency and effectiveness of treatment for childhood motor speech disorders, specifically childhood apraxia of speech (CAS).

Existing models of goal writing were reviewed to ascertain elements common to most of these models. A basic framework was chosen and modified to include behaviors, conditions, and approaches to goal measurement tailored to the clinical needs of children with CAS. A resource for clinical decision making for children with CAS was developed to inform goal writing at the onset of treatment and adaptations that occur over the course of treatment. Case studies are presented to demonstrate how the presented framework can be applied to writing goals for motor-based treatment for two different children with CAS.

Children with CAS require a specialized approach to intervention, which requires goals to reflect the unique clinical needs of this population. This tutorial offers resources that use the best available research evidence and current understanding of effective treatment practices for CAS to guide clinical decision making for motor-based intervention and goal writing. This tutorial is intended to guide treatment planning across varied settings to facilitate progress and optimize treatment outcomes for children with CAS.

Early loss of spiral ganglion neurons in the auditory system after noise trauma.

Audiology and Neuro-Otology

Noise-induced hearing loss (NIHL) is one of the most frequent recognized occupational diseases. The time course of the involved pathologies is still under investigation. Several studies have demonstrated an acute damage of the sensory tissue, but only few experiments investigated the degeneration of (type I) spiral ganglion neurons (SGN), representing the primary neurons in the auditory system. The aim of the present study was to investigate the time course of SGN degeneration within a 7-day period after traumatic noise exposure starting immediately after trauma.

Young adult normal hearing mice were noise exposed for 3 hours with a broadband noise (5 - 20 kHz) at 115 dB SPL. Auditory threshold shift was measured by auditory brainstem recordings (ABR) and SGN densities were analyzed at different time points during the first week after acoustic trauma.

Significant reduction of SGN densities was detected and is accompanied by a significant hearing loss. Degeneration starts within hours after the applied trauma, further progressing within days post-exposure.

Early neurodegeneration in the auditory periphery seems to be induced by direct overstimulation of the auditory nerve fibers. SGN loss is supposed to be a result of inflammatory responses and neural deprivation, leading to permanent hearing loss and auditory processing deficits.

Cross-Sectional Associations of Peripheral Hearing, Brain Imaging, and Cognitive Performance With Speech-in-Noise Performance: The Aging and Cognitive Health Evaluation in Elders Brain Magnetic Resonance Imaging Ancillary Study.

Am J Audiology

Population-based evidence in the interrelationships among hearing, brain structure, and cognition is limited. This study aims to investigate the cross-sectional associations of peripheral hearing, brain imaging measures, and cognitive function with speech-in-noise performance among older adults.

We studied 602 participants in the Aging and Cognitive Health Evaluation in Elders (ACHIEVE) brain magnetic resonance imaging (MRI) ancillary study, including 427 ACHIEVE baseline (2018-2020) participants with hearing loss and 175 Atherosclerosis Risk in Communities Neurocognitive Study Visit 6/7 (2016-2017/2018-2019) participants with normal hearing. Speech-in-noise performance, as outcome of interest, was assessed by the Quick Speech-in-Noise (QuickSIN) test (range: 0-30; higher = better). Predictors of interest included (a) peripheral hearing assessed by pure-tone audiometry; (b) brain imaging measures: structural MRI measures, white matter hyperintensities, and diffusion tensor imaging measures; and (c) cognitive performance assessed by a battery of 10 cognitive tests. All predictors were standardized to z scores. We estimated the differences in QuickSIN associated with every standard deviation (SD) worse in each predictor (peripheral hearing, brain imaging, and cognition) using multivariable-adjusted linear regression, adjusting for demographic variables, lifestyle, and disease factors (Model 1), and, additionally, for other predictors to assess independent associations (Model 2).

Participants were aged 70-84 years, 56% female, and 17% Black. Every SD worse in better-ear 4-frequency pure-tone average was associated with worse QuickSIN (-4.89, 95% confidence interval, CI [-5.57, -4.21]) when participants had peripheral hearing loss, independent of other predictors. Smaller temporal lobe volume was associated with worse QuickSIN, but the association was not independent of other predictors (-0.30, 95% CI [-0.86, 0.26]). Every SD worse in global cognitive performance was independently associated with worse QuickSIN (-0.90, 95% CI [-1.30, -0.50]).

Peripheral hearing and cognitive performance are independently associated with speech-in-noise performance among dementia-free older adults. The ongoing ACHIEVE trial will elucidate the effect of a hearing intervention that includes amplification and auditory rehabilitation on speech-in-noise understanding in older adults.

https://doi.org/10.23641/asha.25733679.

Enhancing Early Identification of Speech-Language-Hearing Delays Through Interprofessional Peer Teaching in a Communication Sciences and Disorders Graduate Training Program.

Am J Audiology

In the current health care landscape, a paradigm shift toward team-based care is underway. Integrating interprofessional education experiences into graduate communication sciences and disorders (CSD) programs is essential to cultivate collaborative skills and prepare future professionals for the interprofessional demands of the field. Within this context, peer teaching has emerged as a noteworthy strategy to promote learning. This study aims to contribute to this evolving field by reporting the impact of an interprofessional (speech-language pathology and audiology) peer teaching educational intervention on physician assistant (PA) students' knowledge of speech-language-hearing developmental milestones and developmental screening.

A quantitative, descriptive methodology with a pretest, posttest interventional design was utilized to assess the impact of a CSD peer-led educational intervention on the knowledge of 35 PA students. The perceived satisfaction of the PA students with the peer-led educational experience was also evaluated.

Data analysis revealed a significant increase on knowledge posttest scores compared to pretest scores. PA students also reported an overall positive peer learning experience.

The collaboration between speech-language pathology, audiology, and PA students through peer teaching holds significant importance in the context of pediatric primary care, and for CSD graduate trainings programs interested in improving educational experiences that tailor to interprofessional learning and practice.

Examining Force Level Output of Skin-Drive Bone Conduction Hearing Devices in Adults With Simulated Conductive Hearing Loss.

Am J Audiology

Bone conduction hearing devices (BCDs) that deliver sound across the skin (i.e., transcutaneous) are suitable for some individuals who have conductive or mixed hearing losses. Prescriptive targets for percutaneous devices are available, for example, from the Desired Sensation Level-Bone Conduction Hearing Device (DSL-BCD) algorithm. These targets, however, may require modification for use with transcutaneous BCDs. The current study investigated three key variables that may inform target modification: (a) comparison of thresholds measured using an audiometric bone conduction (BC) transducer versus transcutaneous BCDs that offer in situ threshold measurement, (b) transcutaneous BCD default force level outputs versus recommended DSL percutaneous BC targets, and (c) the preferred listening levels (PLLs) of adults wearing transcutaneous BCDs in a laboratory setting.

Bilateral conductive hearing loss was simulated in 20 normal-hearing adults via earplugs. Thresholds were measured using a B-71 BC transducer and two commercially available BCDs coupled to a soft headband. DSL percutaneous BC targets were generated, and PLLs were obtained for a 60-dB SPL speech stimulus. Force level outputs were measured using a skull simulator on the Audioscan Verifit2 at the hearing aids' default settings and at the participants' PLL for each device.

On average, audiometric BC thresholds were significantly better than those measured in situ with each BCD. PLLs were similar to prescribed targets for one device with the smoother response shape and agreed in the high frequencies for both devices.

In situ thresholds are significantly higher than audiometric BC thresholds, suggesting that device-based in situ measurement more accurately accounts for the signal transmission from transcutaneous BCDs. PLLs differed from the percutaneous targets and varied between devices, which may indicate that either target modifications or manipulations of device frequency response shaping are needed to approximate PLL with transcutaneous BCD devices.

Family Resilience in Primary Caregivers of Children Who Are Deaf and Hard of Hearing.

Am J Audiology

This study aimed to investigate family resilience-defined as the capacity of a family to harness its collective strengths and resources to recover from and adapt to significant adversities or crises effectively-in primary caregivers of children who are deaf and hard of hearing (cDHH) and its association with quality of life, life satisfaction, perceived social support, and loneliness.

The study involved 108 primary caregivers of cDHH and 139 primary caregivers of children with normal hearing. Participants underwent psychometric evaluations including the Family Resilience Scale, World Health Organization Quality of Life Assessment-Brief Form, Satisfaction with Life Scale, UCLA Loneliness Scale, and Multidimensional Scale of Perceived Social Support.

Significant differences were found in almost every scale and its subdimension between the two groups (p < .05). Correlation analysis revealed significant correlations between all scale total scores for both groups (p < .05, .153 < | r | < .737). Quality of life was found to be a significant predictor of family resilience, F(1, 139) = 41.824, R2 = .279, B = 0.495, t = 6.467, p < .001.

Our study highlights the significant impact of having cDHH on caregivers' family resilience, quality of life, life satisfaction, feelings of loneliness, and perceived social support. The results underscore the importance of enhancing caregivers' quality of life as a potential strategy to improve their family resilience. Further research is needed to understand the complex interplay of factors influencing these outcomes.

Self-reported social well-being of children with hearing loss in 2023.

Cochlear Implants International

To study the level of social well-being for children with HL using self-completed questionnaires.

The data sample relates to a total of 22 children representing a new group of children with hearing loss (HL). This new group is defined as HL detected through neonatal hearing screening and fitted with hearing technology when relevant before 6 months, received bilateral cochlear implants before one year of age followed by specific educational training using the auditory-verbal practice. The age range was from 9 to 12 years. Two self-completed questionnaires were used: The California Bullying Victimisation Scale (CBVS) and the Strengths and Difficulties Questionnaire (SDQ). The project design was a prospective case series.

Self-completed assessments revealed levels of social well-being for both questionnaires comparable to populations with normal hearing. CBVS results showed that a total of 52.6% reported being 'not a victim', 36.8% peer victims and 10.5% bully victims. Results from SDQ revealed that 94.7% of the children reported being within the normal level for scores on both social strength and difficulties, 5.3% scored slightly raised/lowered and 0% had high/low scores or very high/low scores.

The new group of children with HL presented with self-completed scores comparable to peers with normal hearing. It is time to raise expectations for children with HL in terms of not only outcomes on audition and spoken language but also most importantly on levels of social well-being. Furthermore, it is discussed whether this new group can also be defined as a new generation of children with HL.

Electroacoustic evaluation of the bone conduction transducer B250 for vestibular and hearing diagnostics in comparison with Radioear B71 and B81.

International Journal of Epidemiology

The objective is to evaluate the electroacoustic performance of the B250 transducer and to compare it with the two most widely used audiometric transducers B71 and B81.

The electroacoustic performance was evaluated in terms of sensitivity level, distortion, maximum hearing level and electrical impedance.

Six B250 prototype transducers were evaluated and compared with published data of B71 and B81 together with complementary measurements of maximum hearing level at 125 Hz and phase of electrical impedance. Differences in reference equivalent threshold vibratory force levels were estimated by comparing hearing threshold measurements of 60 healthy ears using B81 and B250.

B250 has approximately 27 dB higher sensitivity levels than both B71 and B81 at 250 Hz and can generate higher maximum hearing level at low frequencies: 11.8 to 35.8 dB (125-1000 Hz) higher than B71, and 1.4 to 18.6 dB (125-750 Hz) higher than B81. The maximum average difference in reference threshold force levels was 13.5 ± 8.7 dB higher for B250 at 250 Hz compared to B81.

B250 can produce higher output force with less distortion than B71 and B81, especially at 125 and 250 Hz, which could possibly improve low frequency investigations of the audio-vestibular system.

The role of cochlear and vestibular afferents in long-latency cervical vestibular evoked myogenic potentials.

International Journal of Epidemiology

To examine the origin of cervical vestibular evoked myogenic potential (cVEMP) late waves (n34-p44) elicited with air-conducted click stimuli.

Using a retrospective design, cVEMPs from normal volunteers were compared to those obtained from patients with vestibular and auditory pathologies.

(1) Normal volunteers (n = 56); (2) severe-to-profound sensorineural hearing loss (SNHL) with normal vestibular function (n = 21); (3) peripheral vestibular impairment with preserved hearing (n = 16); (4) total vestibulocochlear deficit (n = 23).

All normal volunteers had ipsilateral-dominant early p13-n23 peaks. Late peaks were present bilaterally in 78%. The p13-n23 response was present in all patients with SNHL but normal vestibular function, and 43% had late waves. Statistical comparison of these patients to a subset of age-matched controls showed no significant difference in the frequencies, amplitudes or latencies of their ipsilateral early and late peaks. cVEMPs were absent in all patients with vestibular impairment.

The presence of long-latency cVEMP waves was not dependent on the integrity of sensorineural hearing pathways, but instead correlated with intact vestibular function. This finding conflicts with the view that these late waves are cochlear in origin, and suggests that vestibular afferents may assume a more prominent role in their generation.