Neonatal Screening for Prevalence of Hearing Impairment in Rural Areas

Newborn and infant hearing screening for early detection of hearing loss in Nairobi, Kenya

Background

Early detection of hearing loss and subsequent intervention leads to better speech, language and educational outcomes giving way to improved social economic prospects in adult life. This can be achieved through establishing newborn and infant hearing screening programs.

Objective

To determine the prevalence of hearing loss in newborns and infants in Nairobi, Kenya.

Methods

A cross-sectional pilot study was conducted at the National hospital and at a sub county hospital immunization clinic. A total of 9,963 babies aged 0-3 years, were enrolled in the hearing screening program through convenient sampling over a period of nine months. A case history was administered followed by Distortion Product Oto-acoustic emissions (DPOAEs) and automated auditory brainstem response (AABR) hearing screening.

Results

The screening coverage rate was 98.6% (9963/10,104). The referral rate for the initial screen was 3.6% (356/ 9,963), the return rate for follow-up rescreening was 72% (258 babies out of 356) with a lost to follow-up rate of 28% (98/356). The referral rate of the second screen was 10% (26/258). All the 26 babies referred from the second screen returned for diagnostic hearing evaluation and were confirmed with hearing loss, yielding a prevalence of 3/1000.

Conclusions

Establishing universal newborn and infant hearing screening programs is essential for early detection and intervention for hearing loss. Data management and efficient follow-up systems are an integral part of achieving diagnostic confirmation of hearing loss and early intervention.

Neonatal hearing screening using a smartphone-based otoacoustic emission device: A comparative study

OBJECTIVE

Increasing options are becoming available for clinicians and healthcare professionals who use smartphone-based applications (apps) to identify hearing loss. The use of smartphone-based apps for newborn hearing screening (NHS) has been proposed as an alternative screening method in NHS programs. This study aims to compare the screening outcomes of a smartphone-based otoacoustic emission (OAE) screening device to a commercially available OAE screening device.

METHODS

NHS was conducted in the post-natal maternity ward and neonatal intensive care unit (NICU) of two tertiary public healthcare hospitals over a period of 8 months. Within participant DPOAE and TEOAE screening outcomes of a smartphone-based OAE device (hearOAE) were compared to that of the Otodynamics ILO V6.

RESULTS

A total of 176 infants (n = 352 ears; 48.9 % female) underwent NHS (DPOAE n = 176; TEOAE n = 176). The mean age at was 4.5 days (SD 11.3). Signal-to-noise ratio (SNR) were higher with the hearOAE with TEOAE NHS, and equivalent or higher SNR at four out of six frequencies with DPOAEs. Mean and total noise levels were significantly lower for the hearOAE compared to the Otodynamics with DPOAEs noise levels of five out of six frequencies being equivalent to, or lower than the Otodynamics (p < 0.001). Lower noise levels are likely to be advantageous in less-than-ideal test conditions. Inter-device DPOAE comparison indicated no statistically significant difference in the refer rate between the devices (p = 0.238). DPOAE pass rates between devices differed in 6 ears (p > 0.05), and in 20 ears for TEOAEs, with the hearOAE demonstrating a higher TEOAE pass rate (p = 0.009). The hearOAE did, however, demonstrate lower noise levels at three out five frequencies, which may have impacted the pass rate. No statistically significant correlation was found between the independent variables and the screening outcome (pass/refer) for TEOAEs using either device (p = 0.105 to 0.810). A high concordance of NHS outcomes within-participants of 89.7 % and 85.0 % for DPOAE and TEOAE respectively, was measured.

CONCLUSIONS

The mHealth based OAE device demonstrated good agreement in NHS outcomes compared to a commercially available device. This verifies the performance of the novel smartphone based OAE device, and may facilitate increased accessibility of decentralised NHS service in resource constrained populations.

Newborn Hearing Screening with Two-Step Protocol and Risk Factor Identification: Our Experience at a Tertiary Care Centre in Eastern India

Objective

To estimate the prevalence of hearing loss and identify the high-risk factors among neonates with hearing loss.

Methods

Retrospective study done on 1054 infants in a tertiary care centre in Eastern India from 2020 to 2021 and approved by the Institutional Ethics Committee. A two-step protocol is used for screening. In the well-nursed group, OAE and BOA were performed. In the case of REFER results for automated ABR following OAE evaluation in well-nursed babies, a detailed audiological evaluation was scheduled to be carried out using diagnostic ABR within one month of age. In the high-risk group, hearing screening includes OAE, BOA, and AABR evaluations. AABR evaluation was performed as a part of the screening protocol irrespective of the results of OAE screening as PASS or REFER.

Results

In our study among 1053 neonates screened, 375 were in the risk category, and 679 were without risk factors. The overall prevalence of hearing loss in neonates was 22.78 per 1000 screened neonates and 56 per 1000 among high-risk neonates. In the high-risk group, we were able to identify 4 cases of Auditory spectrum neuropathy disorder with the use of AABR during 1st step of screening. In multivariate regression analysis, the risk factors for hearing loss identified were NICU stay (OR = 3.6, 95% CI = 1.1-12.03) and Craniofacial anomalies (OR = 55.37, 95% CI = 16.48- 186.01).

Conclusion

Early neonatal screening helps in the detection, intervention, and rehabilitation of hearing loss. The use of AABR in risk infant screening enhanced the chance of detection of auditory spectrum neuropathy disorder (ASND) cases.

Supplementary Information

The online version contains supplementary material available at 10.1007/s12070-023-03723-3.

Early hearing detection and intervention (EHDI) programmes for infants and young children in low-income and middle-income countries in Asia: a systematic review

BACKGROUND

Early hearing detection and intervention (EHDI) measures initiated in high-income countries (HICs) were attempted in low-income and middle-income countries (L&MICs). However, information regarding the models of EHDI, context-specific adaptations made to strategies and outcomes are not known.

AIMS

The aims of this systematic review were to identify the various models of EHDI used in Asian L&MICs in the published scientific literature and to describe their efficacy and validity.

METHODS

The studies were eligible if the programme was from Asian L&MICs, implemented for children below 6 years of age and published between 2010 and 2021. Google Scholar, PubMed, Web of Science, Scopus, EBSCOHost and EBSCO-CINAHL were used to find articles. Data were extracted from each selected article, and the risk of bias was assessed. The search results were summarised using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses flow diagram. For primary outcomes, narrative synthesis was used, and forest plots were generated for secondary outcomes.

RESULTS

In all, 82 studies were included, and these studies were divided into two categories: newborn and infant screening programmes and screening programmes for older children. Predominantly, a two-stage objective otoacoustic emission (Distortion Product/Transient Evoked) or automated auditory brainstem response screening, followed by a detailed auditory brainstem response to confirm the hearing loss, was used in newborn and infant screening programmes. Audiologists were the most frequent screening personnel. Screening of older children was mostly done by otolaryngologists, school instructors and nurses. They performed a single-stage pure tone audiometry screening followed by a detailed examination.

CONCLUSION

The screening tools and protocols used were similar to those used in HICs. However, no uniform protocols were followed within each country. Long-term viability of EHDI programmes was not known as there was limited information on impact outcomes such as cost-benefit.

PROSPERO REGISTRATION NUMBER

CRD42021240341.

Outcome of Universal Neonatal Hearing Screening Programme at a Tertiary Care Centre: A Prospective Study

Hearing is an important sense organ for human beings essential for speech, language and overall development. Universal neonatal hearing screening programmes are mandatory in many developed countries. In India out of 1000 neonates approximately 5-6 infants are diagnosed with hearing impairment but still universal neonatal hearing screening programme is in its infancy. To screen all neonates delivered at our centre in three years, with secondary objective of determining the significance of risk factors with neonatal hearing loss and to provide appropriate intervention following the detection of a permanent hearing impairment. It is a non-randomised prospective cohort study conducted at a tertiary care centre to screen all neonates born between Jan 2017 and Dec 2019 with 2 stage protocol using distortion product otoacoustic emission and auditory brainstem response. The study population was also divided into two groups, ''at risk'' and ''no risk'' groups to determine the significance of risk factors on neonatal hearing loss. Total 2676 neonates were screened, OAE referral rate was 1.53%. There was a 94.12% follow up. The incidence of hearing impairment was found to be 7 per 1000(In the "no risk" group, 2.9 per 1000 and in the "at risk" group, 41.38 per 1000). Statistically, a significant difference was found in the incidence of hearing impairment between the two groups (p < 0.05, chi-square Test). Hospital based universal hearing screening of new born before discharge is feasible at a tertiary care centre. A high incidence of 0.7% congenital hearing impairment warrants universal newborn hearing screening programme. Considering the limitations and infrastructure in India, we should at least employ screening for all high risk neonates.

A Study of JCIH (Joint Commission on Infant Hearing) Risk Factors for Hearing Loss in Babies of NICU and Well Baby Nursery at a Tertiary Care Center

Babies in Neonatal Intensive Care Units (NICU) have an additional risk for hearing loss due to various risk factors like, prematurity, low birth weight, mechanical ventilation, hyperbillirubinemia, ototoxic drugs, low APGAR score etc. as compared to the babies from well baby nursery (WBN) who, poses risk factors mostly family history, syndromic deafness. So the present study was aimed know the risk factors responsible for hearing loss in NICU and WBN babies and to assess the incidence of deafness. A total of 800 babies from NICU (n = 402) and WBN (n = 398) underwent hearing screening from a tertiary care center. Hearing screening was done using two staged screening protocol as per JCIH guidelines with Distortion product Evoked Otoacoustic Emissions (DPOAE) and Automated Auditory Brainstem Responses (A-ABR). According to DPOAE test, 311 from NICU and 383 from WBN passed the test and during second screening, 80 out of 91 from NICU and 11 out of 13 from WBN passed the DPOAE test. Further BERA was done at the 3rd month of corrected age where 6 out of 11 showed positive responses from NICU and 3 babies from WBN had profound hearing loss. Data analysis revealed that family history of deafness, anemia and hypertension in ANC, TORCH in mother, low Apgar score and hyperbillirubinemia in newborns were a major risk factor for hearing impairment. We conclude that the diagnoses of auditory disorders at early stage due to various risk factors are important since appropriate therapeutic intervention and rehabilitation would help in better development of children.

Protocol and programme factors associated with referral and loss to follow-up from newborn hearing screening: a systematic review

BACKGROUND

An effective newborn hearing screening programme has low referral rate and low loss to follow-up (LTFU) rate after referral from initial screening. This systematic review identified studies evaluating the effect of protocol and programme factors on these two outcomes, including the screening method used and the infant group.

METHODS

Five databases were searched (latest: April 2021). Included studies reported original data from newborn hearing screening and described the target outcomes against a protocol or programme level factor. Studies were excluded if results were only available for one risk condition, for each ear, or for < 100 infants, or if methodological bias was observed. Included studies were evaluated for quality across three domains: sample, screening and outcome, using modified criteria from the Ottawa-Newcastle and QUADAS-2 scales. Findings from the included studies were synthesised in tables, figures and text.

RESULTS

Fifty-eight studies reported on referral rate, 8 on LTFU rate, and 35 on both. Only 15 studies defined LTFU. Substantial diversity in referral and LTFU rate was observed across studies. Twelve of fourteen studies that evaluated screening method showed lower referral rates with aABR compared to TEOAE for well babies (WB). Rescreening before hospital discharge and screening after 3 days of age reduced referral rates. Studies investigating LTFU reported lower rates for programmes that had audiologist involvement, did not require fees for step 2, were embedded in a larger regional or national programme, and scheduled follow-up in a location accessible to the families. In programmes with low overall LTFU, higher LTFU was observed for infants from the NICU compared to WB.

CONCLUSION

Although poor reporting and exclusion of non-English articles may limit the generalisability from this review, key influential factors for referral and LTFU rates were identified. Including aABR in WB screening can effectively reduce referral rates, but it is not the only solution. The reported referral and LTFU rates vary largely across studies, implying the contribution of several parameters identified in this review and the context in which the programme is performed. Extra attention should be paid to infants with higher risk for hearing impairment to ensure their return to follow-up.

Challenges of Universal Newborn Hearing Screening in a Developing Country-a Double-Edged Sword

Objective to implement Universal Neonatal Hearing Screening (UNHS) in a tertiary academic hospital and identify associated risk factors. Prospective study. Screening tests with Otoacoustic Emissions (OAE) were done among newborns, prior to hospital discharge. In babies who fail OAE twice, Brain Response Audiometry (BERA) was done, failing which they were referred to higher ENT center for repeat testing and hearing rehabilitation. A total 2323 babies were admitted in the neonatal unit during the study period. Only 773 babies (a third) could be screened for the first OAE, two thirds being lost to study right at inception!! Among the 773 neonates, in the "at risk" group of 301 neonates, 31(10%) and in the "not at risk" group of 472 neonates, 30 (6%) were lost to follow up respectively. The occurrence of hearing loss in this study population was 1.3 per 1000. Risk factors were noted in 38.9% of this subgroup with occurrence of hearing loss in "at risk" group being 3.32 per 1000. The implementation of UNHS in a developing country like India, has multiple challenges including infrastructural and non-compliance to follow up. In the meantime, the possibility of compromising 'at-risk" neonates, who are significantly more prone to hearing loss, both neonatal and delayed onset, is an additional grave reality which needs deep considerationin this Herculean task of attaining "universality".

The Clinical–Audiological Cross Sectional Study of Deaf-Mute Patients in a Tertiary Care Centre of Uttarakhand State and Literature Review

Deafmutism affects communication and wholesome development of an individual. India has a significant burden of deafness in the country. Even fourteen years after the launch of a National Program for Prevention and Control of Deafness in year 2006, we lack detailed data about the disability from most regions of the country. This study aims at finding out the prevalence, clinical history-examination and audiological profile of deaf-mute patients visiting the Out Patient Department (OPD) of a tertiary care institute in Uttarakhand, and compare the results with similar studies published during last 20 years from India to generate a literature review. Out of 46,049 patients that visited OPD of the institute during the given period of 24 months, 73 cases were short-listed clinically to be enrolled in the study. However, only 55 (75%) of them completed the questionnaire and audiological testing. All information was extracted from the patients/relatives with the help of a questionnaire in the Hindi language. The prevalence of deafmutism in patient presenting in our OPD in the study period was 0.3%. The history of pre-, peri- and post-natal risk factors was present in high percentage (58.2%, 78.2% and 34.5% respectively) of patients. This warrants review of our maternal and child healthcare strategies. The literature review revealed lack of uniform and standardized tool in conducting and reporting of studies on deafmutism. The questionnaire used in this study can be further improved and modified in the future as per the requirements of data collection.

Effects of ambient air pollution, fresh fruit and vegetable intakes as well as maternal psychosocial stress on the outcome of newborn otoacoustic emission hearing screening

BACKGROUND

Newborn hearing screening results indicated that more than 40% of the detected infants had no recognized risk factors. To determine whether maternal exposure to ambient air pollutants and experience of stressful life event, as well as lack of fresh fruit and vegetable during pregnancy are associated with the abnormal hearing development among newborns.

METHODS

A total of 1193 newborns and their mothers were recruited in this study. Personal information and covariates were collected by face to face interview. Medical examination results of newborns and their mothers were extracted from medical record. We estimated personal air pollutant exposure level through inverse distance weighted method based on data from air quality monitoring stations and assessed the auditory development of newborns via distortion product otoacoustic emission (DPOAE). Unconditional logistic regression model was used to estimate the relationship between DPOAE screening result and the potential influential factors as well as the combined effect.

RESULTS

The results indicated that PM₁₀ exposure during the second trimester and stressful life event during the third trimester could increase the risk of not passing DPOAE test among newborns. However, frequent intakes of fruit and vegetable significantly reduced the risk. There was a synergetic interaction between PM₁₀ exposure and stressful life event on neonatal hearing development.

CONCLUSIONS

To alleviate abnormal auditory development among fetus, pregnant woman should decrease the exposures to ambient air pollutant and negative life event and at the same time, intake sufficient fresh fruit and vegetable.

Outcomes of a universal neonatal hearing screening program of 9941 newborns over a one-year period in Campinas, Brazil

OBJECTIVES

To characterize the outcomes of a universal neonatal hearing screening program in Brazil.

METHODS

Retrospective documentary analysis of the hearing screening of the neonates born in the hospital from August 2019 to July 2020. The universal neonatal hearing screening program performed the examination of TEOAE in newborn without risk factors for hearing loss and TEOAE and aABR in neonates with risk factors for hearing loss.

RESULTS

9941 neonatal records were studied, 9088 newborns (91,42%) with no risk factors for hearing loss and 849 newborns (8.54%) with risk factors for hearing loss. 4 newborns (0.04%) had hearing loss in the group without risk factors and 16 newborns (1.88%) in the group with risk factors. In retesting those newborns who failed the UNHS test stage, we had 4 newborns (0.04%) without risk factors and 2 newborns (0,24%) with risk factors who evaded and did not return to service.

CONCLUSION

It was possible to survey the outcomes of one year of the UNHS service and observe that the coverage rate of the service was 99.96%. The use of the combined methodology guaranteed a number of forwardings for less returns. Through this study, it was possible to observe that this service complies with the quality indicators recommended by the guidelines.

Prevalence of hearing loss in India

Background Despite abundant literature, a clear and coherent understanding of hearing loss (HL) in India is limited by the wide disparity in studies. Methods We did a review of published peer-reviewed journal articles. Studies reporting the prevalence and degree of HL in India from 1980 to 2020 were included. Information was gathered on the population characteristics, methodology applied and the prevalence of hearing impairment. The data were analysed to identify trends and at-risk sections of population in various categories. Results Four hundred and forty studies were identified after a database search; 29 full-length articles were selected for final analysis. Using a 3-step screening protocol, hearing impairment (abnormal auditory brainstem response/auditory steady state response) in neonates ranged between 1.59 and 8.8 per 1000 births. Among 'at risk' neonates, it ranged from 7 to 49.18 per 1000 births. In children the prevalence of HL was 6.6% to 16.47%. Otitis media was the most common cause of HL in children. Community-based studies (all ages) reported prevalence of HL between 6% and 26.9% and prevalence of disabling HL between 4.5% and 18.3%. Rural areas and elderly showed a higher prevalence of hearing impairment. Conclusion Despite India's improving health indices, hearing disability remains persistently high. It is a major contributor to the loss of personal potential and a financial strain for the individual and the country. A large-scale multicentric study to identify the degree and type of HL, social awareness campaigns, widespread neonatal screening, strengthening treatment facilities and well-funded rehabilitation programmes can counter the rising prevalence of hearing impairment.

The Prevalence of Hearing Loss Among Babies in the Neonatal Intensive Care Unit in a Tertiary Hospital in Malaysia

Objective

To study the prevalence of hearing loss (HL) and to identify the possible risk factors causing HL.

Methods

This retrospective study was conducted from January 2014-December 2016 at a tertiary hospital in Malaysia. All neonates admitted to the neonatal intensive care unit (NICU), Universiti Kebangsaan Malaysia Medical Centre (UKMMC) were screened with a two-step protocol using an automated auditory brain response (AABR) and/or Otoacoustic Emission and auditory brain response (ABR). Descriptive analysis was used for the prevalence of HL, degree of HL and number of risk factors per infant.

Results

A total of 2713 babies underwent hearing screening in NICU was enrolled in this study. Two thousand six hundred eight (96%) babies passed the screening test and 214 (4%) babies required further diagnostic test. Only 105 (49%) babies completed diagnostic tests. Out of 105 babies, 40 (38.1%) babies had HL. Mild HL was the commonest HL with 22 (55%), moderate HL was in seven babies (17.5%), severe HL in two babies (5%), and profound HL in nine babies (22.5%). The presence of craniofacial anomalies was the only significant independent risk factor for HL with p<0.05 with an odds ratio of 0.105 CI 95% [0.028-0.389]. Of Babies with the presence of three or more risk factors, 100% of them had HL.There was an increased risk of hearing loss in those with craniofacial anomalies up to 11 times higher compared to those without such anomalies.

Conclusion

The prevalence of HL among the NICU babies was 1.5% and mild HL was the commonest degree of HL (55%).