Is hearing loss in infants associated with risk factors? Evaluation of the frequency of risk factors

Risk of Hearing Loss in Neonates and Toddlers with in Utero Exposure to SARS-CoV-2

OBJECTIVE

Given the prevalence of neonatal hearing loss (HL) associated with intrauterine viral exposures, the goal of this study is to provide information on neonatal HL in the context of the COVID-19 pandemic.

METHODS

Data were drawn from the COVID-19 Mother Baby Outcomes (COMBO) Initiative. 1007 participants completed the newborn hearing screen as part of routine clinical care (COMBO-EHR cohort) and 555 completed the National Survey of Children's Health (NSCH) at 2 and/or 3 years of age for research purposes (COMBO-RSCH cohort). Maternal SARS-CoV-2 infection status during pregnancy was determined through electronic health records and maternal-reported questionnaires.

RESULTS

In adjusted multivariate logistic regression models covarying for newborn age at assessment, mode of delivery, and gestational age at delivery, there was no significant association between intrauterine SARS-CoV-2 exposure and newborn hearing screening failure (OR = 1.05, 95% CI = 0.39-2.42, p = 0.91) in the COMBO-EHR cohort. In the COMBO-RSCH cohort, there were similar non-significant associations between intrauterine exposure to SARS-CoV-2 and maternal-reported concern for HL on the NSCH (OR = 1.19 [95% CI = 0.30-4.24], p = 0.79).

CONCLUSION

There is no association between intrauterine exposure to SARS-CoV-2 and failed hearing screen in neonates. Similarly, based on the NSCH, there is no association between intrauterine exposure to SARS-CoV-2 and maternal-reported concern for hearing in toddlers. These results offer reassurance given the widespread nature of this pandemic with tens of millions of fetuses having a history of intrauterine exposure.

LEVEL OF EVIDENCE

Level 4 Laryngoscope, 2024.

Risk factors for infant hearing loss: a meta-analysis

Hearing loss is a common disability in infants that significantly impacts their cognitive, language, and literacy development. This study aimed to systematically assess the risk factors for the early identification and intervention in infant hearing loss. Databases were searched for meta-analyses of observational studies until November 2023. The quality assessment was performed using the Cochrane risk of bias tool, and the Grading of Recommendations Assessment, Development, and Evaluation (GRADE) approach was used to assess the certainty of the evidence. A meta-analysis identified 14 risk factors significantly associated with infant hearing loss. According to the GRADE approach, there were four factors with moderate-certainty evidence (low birth weight(LBW), congenital anomalies, craniofacial anomalies, intracranial hemorrhages), seven factors with low-certainty evidence (ototoxic medications, family history of hearing loss, mechanical ventilation > 5 days, intrauterine infection, admission to neonatal intensive care unit (NICU) > 5 days, mechanical ventilation and asphyxia) and six with extremely-low-certainty evidence (very low birth weight < 1500 g (VLBW), hyperbilirubinemia, sepsis or meningitis, male sex, premature birth, small for gestational age (SGA)). Nevertheless, no significant association was found between infant hearing loss and factors such as small for gestational age (SGA), male sex, and premature birth (P > 0.05).  Conclusion: The identification of these 14 interrelated risk factors can prove advantageous in clinical practice, as these findings could guide hearing screening and parental counseling. Furthermore, prospective research could be conducted to develop risk-based scoring systems based on these factors. What is Known: • Infant hearing loss is a worldwide issue. • Risk factors for this condition are debated. What is New: • This is the first meta-analysis to comprehensively evaluate perinatal and postnatal risk factors for hearing loss in infants. • Intracranial hemorrhage, mechanical ventilation, and low birth weight are associated with infant hearing loss. However, no evidence of an association was found between premature birth, being small for gestational age, or male sex and hearing loss.

Hearing Loss and Disorders: The Repercussions of Climate Change

PURPOSE

Climate change is considered to be the greatest threat to human health in the 21st century, and its effects are accelerating. Extensive research has clearly demonstrated its increasing impact across the continuum of health conditions. Despite this, there has been limited attention to the ramifications of climate change on hearing loss and hearing disorders. This lack of consideration is somewhat surprising as the environment itself and its changing nature have a substantial effect on hearing.

METHOD

Tackling climate change could be the greatest global health opportunity of the 21st century. To address this issue, this tutorial provides a general introduction to climate change and its three major elements (pollution, infectious diseases, and extreme weather events) and their effects on health. The substantial consequences of climate change for the incidence, development, and exacerbation of hearing loss and disorders are clearly described and detailed.

CONCLUSIONS

The challenge of responding to this very real and escalating threat to hearing requires a combination of prevention, advocacy, and education. These three roles place audiologists in the perfect position to take action on the far-reaching effects of climate change on hearing loss and disorders. To respond to this challenge and to fulfill these roles, several strategies, ranging from the individual level to the global level, are delineated for audiologists to incorporate into their practice.

Outcomes and Management of Infants Who Refer Newborn Hearing Screening

OBJECTIVES

With the implementation of Universal Newborn Hearing Screening, early diagnosis and referral has been expedited. Many patients who refer screening pass subsequent testing with otoacoustic emissions (OAE) or auditory brainstem response (ABR). The objective of our study was to identify the incidence and etiology of hearing loss in infants who refer initial testing in an urban, tertiary care pediatric otolaryngology practice.

METHODS

We performed a chart review of infants who were evaluated after referring newborn hearing screening from 2017 to 2021. Data collected included birth history, hospital screening results, subsequent audiology and otolaryngology visit findings, final hearing diagnoses, interventions, and outcomes.

RESULTS

Of the 450 patients, 83.8% (n = 377) had normal hearing bilaterally after repeat testing (OAE and/or ABR). Thirty five patients were diagnosed with otitis media with effusion (OME) (7.8%) and 17 patients (3.8%) were diagnosed with sensorineural hearing loss. Twenty seven patients (6.0%) were diagnosed with obstructing cerumen/vernix, many times in addition to another diagnosis. Of the 17 patients with sensorineural hearing loss, 2 had genetic syndromes and 2 had congenital cytomegalovirus. Sensorineural hearing loss was significantly associated with the presence of a deafness syndrome (P = .004) and in-utero infections (P = .04). About 11 (2.4%) underwent myringotomy with tube placement, 5 (1.1%) were fitted with hearing aids, 2 (0.4%) were referred for hearing aids, 4 (0.9%) had both myringotomy with tube placement and hearing aids, 1 child had a soft band/Bone Anchored Hearing Aid (BAHA) (0.2%), and 1 child (0.2%) had a cochlear implant.

CONCLUSION

Our incidence of sensorineural hearing loss was 3.8% (95% CI 2.0, 5.5), compared to rates of 0.44 to 68% in the published literature. Most patients had normal hearing, usually identified after only 1 repeat test. OME requiring myringotomy tube insertion was the most common pathology requiring intervention. Close observation for resolution and intervention, if warranted, is critical to prevent sequelae.

Risk Factors Associated With Hearing Impairment in Infants and Children: A Systematic Review

The purpose of the present systematic review was to synthesize evidence on associated risk factors of hearing loss (HL) in children. Evidence-based research articles on HL published between January 2013 and December 2022 using PubMed, Cochrane, and Scopus databases were searched. The study included children between zero and three years of age who have permanent bilateral/unilateral HL (BHL/UHL) by employing case-control studies, randomized controlled trials, nonrandomized studies, prospective or retrospective cohort studies, and studies with or without comparison groups. The Newcastle-Ottawa Scale (NOS) and the Joanna Briggs Institute (JBI) critical appraisal checklist for longitudinal and cross-sectional studies were used to rate the quality of the chosen studies. The studies that would be considered were reviewed by two independent authors, and a third author was contacted if there was a dispute. A preliminary literature search uncovered 505 articles from the electronic search and 41 studies by hand searching. Duplicate records were eliminated, leaving 432 records. The abstract and title were read, and 340 studies were eliminated. There were 92 articles in total that qualified for full-text screening. Among these, 75 articles were disregarded since they lacked information or failed to assess the risk factors for HL. The qualitative synthesis, therefore, included 17 articles. Most often, cross-sectional study designs were used in the studies that were reviewed, which were then followed by longitudinal studies. Three of the studies that were reviewed used a prospective cohort design. The quality of all the included studies was rated to be good. The current review revealed that the primary statistically significant risk factors for HL included ventilator support; craniofacial anomalies; low birth weight (LBW); forceps delivery; loop diuretics; meningitis; asphyxia; intensive care; consanguinity; sepsis; Apgar scores between 0 and 4 at one minute; toxoplasmosis, other agents, rubella, cytomegalovirus, and herpes (TORCH) infections; and hyperbilirubinemia.

Results and patient satisfaction from an early access infant hearing detection clinic

INTRODUCTION

National recommendations in the United States specify that all infants with hearing impairment should be identified by 3 months of age. Infants who fail universal newborn hearing screening (UNHS) require follow up testing after hospital discharge. Follow up testing may be difficult to obtain in some communities within the ideal time frame. A rapid access multidisciplinary clinic was established for failed UNHS. The objective of this study is to report outcomes and patient satisfaction from an early access hearing detection clinic.

METHODS

Infants that failed UNHS were seen in the multidisciplinary clinic between 1/1/19 and 2/28/22. Patients underwent automated auditory brainstem response (ABR) and distortion product otoacoustic emissions testing and consulted with an otolaryngology nurse practitioner. Failed results were followed by diagnostic ABR. Surveys were administered at the beginning and end of the appointment.

RESULTS

In total, 169 infants were seen at a mean age of 8.4 weeks (95%CI 7.5, 9.4). Repeat testing was abnormal in 38 (22.4%). Diagnostic ABR was performed at an average age of 13.7 weeks (n = 34, 95% CI: 10.8, 16.6) and led to a diagnosis of hearing loss in 18 infants. Twenty-seven parents completed surveys at the initial visit. Anxiety level among patients with normal repeat testing (n = 20) decreased from 1.9 to 1.2 (p = .002), while anxiety level among those with abnormal repeat testing (n = 7) was not statistically different before and after (2.1 vs 2.7, p = .2). Satisfaction level was 3.7 ± 0.7 (scored 1-4). All parents reported having a better understanding of their child's hearing problem after the visit.

DISCUSSION

This novel nurse practitioner-led early hearing detection clinic enabled timely diagnosis of hearing loss and reassurance to families without hearing loss. Age at hearing loss diagnosis compares favorably to published cohorts.

Evaluation of nephrotoxicity and ototoxicity following amikacin administration once daily or every 48 hours in neonates

The purpose of this study was to evaluate the effects of once daily (OD) or every 48 hours (every-48-h) administration of amikacin (AMK) on renal function and ototoxicity in neonates. We investigated the frequency of nephrotoxicity and ototoxicity in neonates who received AMK OD or every-48-h from April 2015 to March 2021 and underwent dose evaluation by therapeutic drug monitoring (TDM). In addition, the relationships among birth weight, gestational age, AMK peak and trough values, total duration of AMK administration, and total AMK dose were examined separately for nephrotoxicity and ototoxicity. AMK was administered OD in 38 patients and every-48-h in 62 patients. Nephrotoxicity was observed in 8 patients on OD versus 36 patients on every-48-h administration (P < .001), and ototoxicity was observed in 2 patients on OD versus 12 patients on every-48-h administration (P = .192). For nephrotoxicity, only the trough value was relevant (P = .007). In terms of ototoxicity, there were no influencing factors. The risk of nephrotoxicity was higher with every-48-h AMK administration than with OD AMK administration, with nephrotoxicity depending on the trough value. However, compared with OD, the every-48-h group had lower body weight and possibly poorer original renal function. In addition, ototoxicity did not differ by administration method. Based on these results, every-48-h administration of AMK can be used as safely as OD by performing TDM and preventing high concentrations.

Ototacoustic Emissions-Based Hearing Assessment of Neonates in Tertiary Care Hospital

Hearing is a special sense needed for appropriate mental, speech and language development and academic performance. Even among normal babies, 50% of cases of hearing loss are missed out if screening protocol is not followed. In this study, we assess the hearing of all neonates born and brought to the tertiary care hospital, and also find out how many well babies with hearing loss would have been missed if this screening had not been done. Hence, the study aims to estimate the prevalence of neonatal hearing loss and study the associated risk factors. Neonates (N = 1559) attended the outpatient department of paediatrics were included. A detailed history of the neonates with special emphasis on prenatal, natal, postnatal, family history, and maternal risk factors were elicited. Three-stage hearing testing protocol was followed with transient evoked otoacoustic emission testing, a gold standard test for stage 1 and 2 and brainstem evoked response audiometry for stage 3. Of 1559 neonates, 138 had hearing loss. History of drug intake, order of the child, place of delivery and maternal history were the significant factors associated with hearing loss in neonates. Bivariate analysis revealed order of child, maternal history, and history of drug taken were the significant factors affecting the hearing loss in the neonates (P < 0.001). The prevalence of hearing loss was 8.85%. Early detection of hearing loss is essential for timely intervention and development of optimal communication skills. Further studies are required to decide the essentiality of Universal New-born hearing screening.

Evaluation of neonatal hearing screening results of newborns with premature retinopathy

OBJECTIVES

To reveal the risk situations of ROP patients in terms of hearing loss by examining the newborn hearing screening test results.

METHODS

Hearing screening test results of ROP patients and newborns with similar congenital risk factors(control group) treated in our hospital were retrospectively screened. Both groups were compared in terms of newborn hearing screening test results.

RESULTS

In the first screening test, the rate of ''refer'' result in the ROP group was significantly higher than the control group (p < 0.05). There was no significant difference between the two groups in terms of second hearing screening test results (p > 0.05). In the second screening test, 100% of stage 3 ROP patients failed from the right ear and 80% in the left ear, and this difference was statistically significant compared to the other two groups (p < 0.05).

CONCLUSION

Newborn hearing screenings of patients with advanced stage ROP patients should be followed up more sensitively, since stage 3 ROP patients had more failure results from the screening test in our study.

Early Biomarkers and Hearing Impairments in Patients with Neonatal Hypoxic-Ischemic Encephalopathy

Identifying biomarkers for hearing impairments (HIs) in patients with neonatal hypoxic–ischemic encephalopathy (HIE), to initialize early hearing habilitation, is crucial. Seventy-eight neonates with HIE were divided into the following two groups: those with HIs and those without HIs. We compared those patients with 11,837 newborns without HIE, and analyzed the risk factors of HIs among neonatal HIE. Of the 78 patients, 11 were confirmed to have an HI, which is a substantially higher percentage than in the 11,837 newborns without HIE (14.1% vs. 0.87%; p < 0.001). More patients with moderate-to-severe HIE had confirmed HIs (p = 0.020; odds ratio, 8.61) than those with mild HIE. Clinical staging, and blood lactate and glucose levels could be predictive factors for HIs among patients with HIE. The patients who exhibited HIs had significantly higher lactate (104.8 ± 51.0 vs. 71.4 ± 48.4; U = 181, p = 0.032) and serum glucose (159.5 ± 86.1 vs. 112.1 ± 62.3; U = 166, p = 0.036) levels than those without HIs. A higher prevalence of HIs was noted in the patients with stage III HIE than those with stage II HIE (43.8% vs. 10%; p = 0.008). The degree of HI correlated with brain anomalies and neurodevelopmental outcomes at 1 year of age. Clinical staging, and blood lactate and glucose levels could be predictive factors for HIs among patients with HIE.

Neonatal Hearing Screening: Prevalence of Unilateral and Bilateral Hearing Loss and Associated Risk Factors

INTRODUCTION

Newborn hearing screening is essential for early identification of hearing loss to decrease the adverse effects of hearing loss. The objective of this study was to determine the prevalence of hearing loss and risk factors of congenital hearing loss in newborns.

METHODS

In this analytical case-control study, a hearing screening test was performed for all newborns aged 3-14 days.

RESULTS

Of 5,500 newborns evaluated, 24 newborns had hearing loss. The prevalence of hearing loss was 4.36 per 1,000. Of 24 hearing-impaired newborns, 15 had bilateral hearing loss (BHL) (62.5%) and nine had unilateral hearing loss (UHL) (37.5%). Among the neonates with hearing loss, the prevalence of hearing loss was higher (77.8%) in the right ear. The main risk factors identified in this study were low gestational age (P=0.001), hospitalization in the neonatal intensive care unit (NICU) (P=0.008), exposure to ototoxic drugs (P=0.001), gestational diabetes P=0.01), craniofacial anomalies (P=0.01), convulsion (P=0.03), consanguineous marriage of parents (P=0.001), low birth weight (P=0.01), and hyperbilirubinemia (P=0.001).

CONCLUSION

The prevalence of hearing loss was higher in the right ear than in the left ear. NICU stay, use of ototoxic drugs, low gestational age (<35 weeks), gestational diabetes, craniofacial anomalies, convulsion, consanguineous marriage of parents, low birth weight, and hyperbilirubinemia were significant risk factors for congenital hearing loss in studied newborns.

The effects of mode of delivery, maternal age, birth weight, gender and family history on screening hearing results: A cross sectional study

Introduction

Congenital hearing impairment is one of the principal issues that make distress to families especially those with a family history of hearing problems. Early detection of hearing impairment can make a difference regarding cognitive, attention, learning, speech, and social and emotional development of babies. Otoacoustic test emission is a very common screening test that can be used to pick up early cases and relieve family stress. We tried to evaluate the factors that may disrupt our results regarding the OAE test.

Methods

A cross-sectional study included infants who were admitted to the nursery unit alone. Infants who were admitted to the NICU unit, infants with craniofacial anomalies, infants with vernix in the external auditory canal, and Infants with Stigmata associated with a syndrome known to include a sensorineural hearing loss were excluded from the study. Both transient evoked otoacoustic emissions (TEOAE) with distortion product otoacoustic emissions (DPOAE) Screening tests were performed by the same professional audiologist experienced in neonatal screening.

Results

A total of 1413 newborns (733 males and 680 females) were included in the study. Among them, 1368 babies (96.8%) passed the first OAE in both ears, while 45 babies (3.2%) didn't pass the first OAE in one or both ears.Significant correlations between the female gender and family history of congenital hearing loss with failure of the first OAE test results. Moreover, vaginal delivery (VD) infants had a 1.5-fold higher failure rates of first OAE test screening results in comparison to caesarian delivery (CD) infants.

Conclusion

Our study demonstrated higher failure rates of the first OAE in female infants, vaginal delivery infants, and infants with a family history of hearing impairment. It is recommended to postpone the first phase of hearing screening for those infants until the first scheduled vaccine appointment to achieve higher compliance attendance, and decrease family stress associated with false-negative results of the test.

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Hearing impairment is a stressful condition that disturbs family quality of life.

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Early detection of hearing impairment can make a difference in child development.

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Otoacoustic test emission is a screening test with considerable reliability.

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Early Otoacoustic test can have false negative results in specific condition.

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Postpone the first phase of hearing screening decrease the family stress.

Our newborn hearing screening results

OBJECTIVE:

The aim of the study was to evaluate the results of neonatal hearing screening in our hospital with the help of literature and to question and reveal the risk factors to gain healthy individuals and to raise awareness for all health workers and the public who are interested in this subject.

METHODS:

A total of 16,388 newborn infants were evaluated between October 2009 and January 2018. All newborns were screened with transient evoked otoacoustic emissions (TEOAEs) test. Risk factors were investigated. The test repetition and auditory brainstem response (ABR) measurements were performed on newborns who could not pass the TEOAE test and the newborns in the risky group after 15 days.

RESULTS:

A total of 116 newborns (0.7%) were suspected to have hearing loss. Twenty-seven newborns (0.16%) were found to be in intensive care unit. Twelve newborns (0.07%) had permanent hearing loss. Then, in order: 9 newborns (0.05%) had received phototherapy and 7 newborns (0.04%) were born to consanguineous marriages. In addition, 3 newborns (0.02%) had a low birth weight and 1 newborn (0.006%) had a history of fever.

CONCLUSION:

Screening tests should be performed in all newborns for early detection of hearing loss. Even though frequency of hearing loss is higher in newborns with risk factors, the treatment should be started within 6 months, the latest, and newborns should be referred for rehabilitation and training.

A prospective observational study to investigate the correlation analysis between neonatal hyperbilirubinemia and deafness gene: Study protocol clinical trial (SPIRIT compliant)

INTRODUCTION

There are many studies on the relationship between serum levels of hyperbilirubinemia and hearing impairment. However, the mechanism of hyperbilirubinemia on auditory impairment is not clear.

METHODS AND ANALYSIS

A total of 1000 children with hyperbilirubinemia who are mainly indirectly elevated bilirubin in the full-term neonatal ward of Xiamen Children's Hospital from March 2020 to September 2020 will be enrolled. Using second-generation high-throughput sequencing technology, 127 deaf-related genes were sequenced from the collected samples. At the same time, physical audiometry was performed on the selected persons and audiometry data were recorded.

DISCUSSION

In this study, we will combine gene sequencing with clinical indications of hyperbilirubinemia to find the loci suitable for high-frequency pathogenic deafness related to hyperbilirubinemia, so as to provide early guidance for deafness gene screening in children with hyperbilirubinemia.

TRIAL REGISTRATION

Chinese Clinical trial registry: ChiCTR2000030075.

Screening of Newborn Hearing at a Tertiary Care Hospital in South India

Hearing loss can have a devastating impact on the cognitive development and psychological well-being of children and their families. Newborn hearing screening should be given special attention especially in a country like ours where the burden of this disability is heavy. Screening all newborns irrespective of risk factors helps in better detection, and hence further management can be initiated at appropriate time. To implement newborn hearing screening at Vanivilas hospital and to estimate the incidence of hearing loss among the high risk groups. To create awareness about the need for detecting childhood deafness among parents and general population. To develop a centre of excellence for evaluation, intervention and rehabilitation for hearing impaired in a tertiary care hospital. Prospective study. All neonates born in Vanivilas Hospital attached to Bangalore Medical College and Research Institute underwent hearing screening using four stage protocols with otoacoustic emission (OAE) tests and final confirmation with Brainstem evoked response audiometry (BERA) tests. May 2015-May 2017. Number of newborns screened were 26,487, and 19 (0.717/1000) newborns were detected to have hearing impairment. The incidence of hearing loss among high risk group was 0.188/1000, and among the non risk group was 0.528/1000. Newborn hearing screening must be made mandatory and multi-staged protocol based screening for hearing loss should be implemented. This will make newborn screening programme more efficient and also will help in initiating treatment at an early stage so that further damage can be prevented.

Mapping the content of mothers' knowledge, attitude and practice towards universal newborn hearing screening for development of a KAP survey tool

Understanding mother’s knowledge, attitude and practice (KAP) of permanent childhood hearing impairment (PCHI) is essential for the success of universal newborn hearing screening (UNHS) as poor compliance and follow-up remains a global challenge. To determine content area for a questionnaire that measures PCHI-related KAP in rural mothers, we trained moderators who interviewed 145 pregnant women (17 groups) from 5 ante-natal clinics. Interviews were recorded, transcribed, summarised and analysed using thematic framework analysis. Four knowledge themes were identified: 1) PCHI was perceived as the malfunction of hearing leading to disability; 2) a poorly-responsive/communicative child may have PCHI; 3) lifestyle, hereditary and environmental factors are significant causes of PCHI; 4) medical management of PCHI was doubted, with some advocating birth and ancestral rituals. Two themes were identified for attitude: 1) beliefs that PCHI was emotionalised due to the negative lifelong impact on the child and family; 2) UNHS processes were favourable though some preferred other belief systems. Three themes were identified for practice: 1) doctors were the first choice followed by traditional healers; 2) willingness to continue follow-up although challenges exist; 3) minimal family support during consultation. The contextualised KAP of women regarding UNHS processes and PCHI provided content area for the design of a KAP tool.

Regional differences of Turkey in risk factors of newborn hearing loss

OBJECTIVE

The aim of this study was to discover Turkish regional differences in the risk factors of newborn hearing loss.

METHOD

A multi-centered retrospective design was used. A total of 443 children, registered to the national newborn hearing screening programme, with bilateral hearing loss, from five different regions of Turkey, were evaluated in terms of the types of hearing loss, the degree of hearing loss, the types of risk factors, parental consanguinity, age at diagnosis and age of auditory intervention, respectively.

RESULTS

There was no significant difference in the prevalence of hearing loss between regions (χ² = 3.210, P = 0.523). Symmetric Sensorineural Hearing Loss (SSHL) was the most common type of HL in all regions (91.8%). Profound HL was the most common degree of HL in all regions (46.2%). There were statistically significant differences between regions in terms of types of HL (χ² = 14.151, P = 0.000). As a total, 323 (72.9%) of subjects did not have any risk factors. There were statistically significant differences between regions in terms of the types of risk factors (pre, peri and post-natal) for SSNHL (χ² = 16.095, P = 0.000). For all regions, the age of diagnosis was convenient with the JCIH criteria. However the age of hearing aid application was prolonged in some regions. There were statistically significant differences between regions in terms of the age of diagnosis (χ² = 93.570, P = 0.000) and the age of auditory intervention (χ² = 47.323, P = 0.000). The confounding effects of gender, age of diagnosis, age of hearing aids applications, HL in the family, types of risk factors for HL on SSNHL were detected.

CONCLUSION

To reach the goal of a high quality newborn hearing screening, there is a need to develop an evidence-based standard for follow up guideline. In addition, risk factors should be re-evaluated according to regional differences and all regions should take their own precautions according to their evidence based data.

Examination of the Relationship between Umbilical Cord Blood Gas Values and Hearing Function in Neonates

Objective

The aim of the present study was to examine the relationship between the results of the transient otoacoustic emission (TEOAE) test used in neonatal hearing screening and the results of the umbilical cord blood (UCB) analysis in neonates.

Methods

This retrospective study included 209 neonates born in the obstetric unit at the 37^th gestational week. Based on the results of the TEOAE test, the neonates included in the study were divided into two groups as the study group composed of those "REFER" (n=141) and the control group consisting those "PASS" (n=68) the test. The UCB sampling procedure was performed on all neonates. In the blood samples, the pH parameters were evaluated by using glass electrodes, and the pCO₂ and pO₂ parameters were evaluated directly by using sensitive electrodes.

Results

When the additional maternal diseases were compared with the TEOAE results, the ratio of hypothyroidism was found to be statistically higher in the study group (p<0.05). In terms of the pO₂, pCO₂, HCO₃, and pH values obtained as a result of analyzing the UCB samples, there was no statistically significant difference between the groups (p>0.05).

Conclusion

The results of the present study showed that there was no statistically significant difference between the results of UCB analysis and the TEOAE test. However, we believe that conducting a larger study evaluating other parameters and employing UCB analysis would be useful, and UCB evaluation, which is an inexpensive, easy and effective method in determining hypoxia in neonates, might be a significant marker in cases at risk of hearing loss.

Prevalence and independent risk factors for hearing impairment among very low birth weight infants

BACKGROUND

Although we've made big strides in perinatal and neonatal care, auditory handicap remains a serious complication in those who were born very premature.

OBJECTIVES

The aim was to determine the prevalence and analyze possible risk factors of hearing impairment in very-low-birth-weight (VLBW) infants.

MATERIALS AND METHODS

This was a retrospective study by reviewing medical records of all VLBW infants (BW ≤ 1500 g) admitted to NICU of Chang Gung Children's Hospital over 2 years period from Jan. 2010 to 2011. Brainstem auditory evoked potentials (BAEP) hearing screening was performed at 3 months postnatal corrective age and repeated if failed the 1st time, then refer to ENT doctor if BAEP confirmed abnormal. All VLBW infants examined for hearing impairment were included and data were retrieved retrospectively and analyzed for neonatal risk factors using logistic regression.

RESULTS

Over the period, 309 VLBW infants were screened. Prevalence of uni- or bilateral hearing impairment was 3.9% (12/309; 95% CI 2.6-4.1). The mean corrective age on diagnosed of hearing impairment was 2.9 ± 1.1 (range 1-5) months. Mean gestational age was 27.9 weeks (SD 1.4) and mean birth weight was 1028 g (SD 180). By univariant analysis for hearing impairment, severe birth asphyxia, craniofacial anomalies, ventilator dependence, patent ductus arteriosus ligation, and use of postnatal ototoxins yielded good prediction of hearing impairment in this population. However, using multivariate analysis revealed that the only independent risk factors for hearing impairment were ototoxins (OR: 3.62; CI: 1.67-7.82), PDA ligation (OR: 4.96; CI: 2.34-10.52), craniofacial anomalies (OR: 3.42; CI: 1.70-6.88)and assisted prolonged use of oxygen at gestational age of >36 weeks (OR: 5.94; CI: 2.61-13.54).

CONCLUSION

The incidence of hearing impairment among VLBW infants was 3.9%. Prolonged supplemental oxygen use is a marker for predicting hearing impairment; this requires detailed analysis of the pathophysiologic features, to reduce the prevalence of hearing impairment.

Risk Factors for Failed Newborn Otoacoustic Emissions Hearing Screen

Objective To identify any socioeconomic, demographic, neonatal, and perinatal factors that may be associated with failing the otoacoustic emissions (OAE) newborn hearing screen. Study Design A retrospective chart review was performed looking at hearing screens performed on 1272 newborn infants by OAE testing. Socioeconomic, demographic, neonatal, and perinatal factors were reviewed to determine association with failing the OAE newborn hearing screen. Results Our results demonstrate that Hispanic race was significantly associated with failing the newborn OAE hearing screen with an odds ratio of 2.54 (CI = 1.56-4.14, P = .0002). Family history of hearing loss was also significantly associated with failing the newborn hearing screen. Newborns with a family history of hearing loss were 13 times more likely to fail the newborn screen (odds ratio = 13.63, CI = 4.09-45.43, P < .0001). Conclusions Hispanic race and family history of hearing loss are statistically significant risk factors for failing the newborn OAE hearing screen.