|Embryology - 17 Mar 2018 Expand to Translate|
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The incidence of significant permanent hearing loss is approximately 1-3/1000 newborns. Neonatal hearing screening is carried out in the USA, UK and in Australia (2002 NSW Statewide Infant Screening Hearing Program, SWISH) There is a general guide giving a timetable for a number of simple responses that a neonate should make if hearing has developed normally (More? Neonatal Hearing Check List).
State Wide Infant Screening Hearing Program (SWISH) a newborn hearing testing program using an automated auditory response technology (AABR). Program was introduced in NSW Australia in 2002 across 17 area health service coordinators. It is thought that in NSW 86,000 births/year = 86-172 babies potentially born with significant permanent hearing loss.
Automated Auditory Brainstem Response (AABR) uses a stimulus which is delivered through earphones and detected by scalp electrodes. The test takes between 8 to 20 minutes and has a sensitivity 96-99%.
|Neonatal Diagnosis: APGAR test | Guthrie test | Hearing test | Electrocardiogram (ECG/EKG) | X-ray | Tandem mass spectrometry | Classification of Diseases|
Some Recent Findings
|More recent papers|
This table shows an automated computer PubMed search using the listed sub-heading term.
References listed on the rest of the content page and the associated discussion page (listed under the publication year sub-headings) do include some editorial selection based upon both relevance and availability.
Chelsea M Blankenship, Lisa L Hunter, Douglas H Keefe, M Patrick Feeney, David K Brown, Annie McCune, Denis F Fitzpatrick, Li Lin Optimizing Clinical Interpretation of Distortion Product Otoacoustic Emissions in Infants. Ear Hear: 2018; PubMed 29517520
Monika Zych, Grażyna Greczka, Piotr Dąbrowski, Maciej Wróbel, Joanna Szyfter-Harris, Witold Szyfter The report of the Polish Universal Neonatal Hearing Screening Program in 2016. Otolaryngol Pol: 2018, 72(1);1-4 PubMed 29513258
Katarzyna Wroblewska-Seniuk, Piotr Dabrowski, Grazyna Greczka, Katarzyna Szabatowska, Agata Glowacka, Witold Szyfter, Jan Mazela Sensorineural and conductive hearing loss in infants diagnosed in the program of universal newborn hearing screening. Int. J. Pediatr. Otorhinolaryngol.: 2018, 105;181-186 PubMed 29447811
Maggie Yee Yan Lam, Eddie Chi Ming Wong, Chi Wai Law, Helena Hui Ling Lee, Bradley McPherson Maternal knowledge and attitudes to universal newborn hearing screening: Reviewing an established program. Int. J. Pediatr. Otorhinolaryngol.: 2018, 105;146-153 PubMed 29447803
Lilian Sanches Oliveira, Dayane Domeneghini Didoné, Alessandra Spada Durante Automated cortical auditory evoked potentials threshold estimation in neonates. Braz J Otorhinolaryngol: 2018; PubMed 29409720
Automated Auditory Brainstem Response
|waves I and II
arise ipsilaterally to the stimulus and reflect the action potential of the auditory nerve
|waves III, IV and V
receive contralateral inputs
(AABR) uses a stimulus which is delivered through earphones and detected by scalp electrodes. The test takes between 8 to 20 minutes and has a sensitivity 96-99%. The basis of a neonatal hearing test that uses a trigger stimulus delivered through earphones and subsequent brain electrical activity then detected by scalp electrodes. Then by computer analysis, averaging all the electrical activity following the trigger, peaks emerge reflecting signal passage activity through brain stem nuclei in the hearing central neural pathway. The infant test takes between 8 to 20 minutes, has a sensitivity 96-99%, and unlike other childhood auditory testing does not require a subject response. An increased absolute latency has been seen to occur in premature infants related to decreased myelinization affecting the electrical conduction delays up to the brainstem.
An alternative and simple test (pass/refer) used at a later stage is otoacoustic emission testing.
Otoacoustic Emission Testing
(OAE) The basis of a simple infant hearing test of the inner ear. A small probe containing both a speaker producing "clicks" and a microphone to detect cochlea responses is placed inside the ear canal. Acoustic energy produced by vibration of the hair cells in response to the clicks is detected by the microphone within the probe. A more complex test that can be used at an earlier stage is the automated auditory brainstem response.
Neonatal Hearing Check List
The timing and types of responses listed below reflect only a rough guide for the general population. Abnormalities in neurological, visual or motor skill development can also affect responses.
- Birth to 3 months - Reacts to loud sounds, Quiets to familiar voices or sounds, Makes cooing noises, Responds to speech by looking at speaker’s face
- 3 to 6 months - Turns eyes or head toward sounds, Starts to make speech-like sounds, Laughs and makes noises to indicate pleasure and displeasure
- 6 to 9 months - Babbles, ‘dada’‘ma-ma’‘baba’, Shouts/vocalises to get attention, Will often respond to ‘no’ and own name, Responds to singing and music
- 9 to 12 months - Imitates speech sounds of others, Understands simple words, eg ‘ball’,‘dog’, ‘daddy’, Turns head to soft sounds, First words emerge
- 12 to 18 months _ Appears to understand some new words each week, Follows simple spoken instructions, eg ‘get the ball’, Points to people, body parts or toys when asked, Continually learns new words to say although may be unclear
- 18 to 24 months - Listens to simple stories or songs, Combines two or more words in short phrases eg ‘more juice’
Hearing check list text based upon NSW Health Pamphlet - Why does my baby need a hearing check?
The following are examples of simple assessment of development in early hearing and understanding.
|12 month Behaviour||18 month Behaviour||30 month Behaviour|
|Movie Source - Paul D. Larsen|
|Movies from the PediNeuroLogic Exam website are used by permission of Paul D. Larsen, M.D., University of Nebraska Medical Center and Suzanne S. Stensaas, Ph.D., University of Utah School of Medicine. Additional materials were drawn from resources provided by Alejandro Stern, Stern Foundation, Buenos Aires, Argentina; Kathleen Digre, M.D., University of Utah; and Daniel Jacobson, M.D., Marshfield Clinic, Wisconsin. The movies are licensed under a Creative Commons Attribution-NonCommerical-ShareAlike 2.5 License.|
Hearing Loss Risk Factors
The following selected genetic and environmental conditions have been identified as risk factors for hearing loss.
- syndrome known to be related to hearing loss
- close family history of congenital hearing impairment (parent / sibling)
- congenital abnormality of the head / neck (excluding minor pits/ ear tags)
- maternal infections during pregnancy such as HIV, TORCH - (Toxoplasmosis, Other (syphilis, varicella), Rubella, CMV, Herpes)
- meningitis / encephalitis
- jaundice requiring exchange transfusion
- ventilation greater than 5 days (excluding continuous positive airway pressure)
- amino glycoside antibiotic therapy for greater than 3 days
- New South Wales - State Wide Infant Screening Hearing Program (SWISH) was introduced in NSW Australia in 2002 across 17 area health service coordinators.
- Victoria - Victorian Infant Hearing Screening Program (VIHSP) provides statewide newborn hearing screening to babies born at all Victorian maternity hospitals.
The following data and modified text is from a recent review describing newborn hearing screening (NHS) activities in Latin America.
- Chile - since July 2005, Chilean law has required targeted hearing screening using otoacoustic emissions (OAE) and auditory brainstem response (ABR) technology for all premature newborns born before 32 weeks and weighing less than 1500 g who are discharged from the 28 facilities with a neonatal intensive care unit.
- Costa Rica - since 2004, a few centers have been providing NHS services using OAE to screen some high-risk children.
- Guatemala - does not have legislation requiring NHS. In 2004, high-risk targeted NHS was implemented in one hospital in the capital city, and a second site was established in 2008. These NHS programs were started with donated OAE equipment and there were plans to expand as additional (donated) equipment became available. In 2008, the OAE equipment in the first hospital broke, and as of June 2009 it had not been repaired, which left only one hospital performing hearing screenings.
- Mexico - since February 2005, a national law was passed requiring hearing screening for all newborns and audiological evaluation. In July 2007, the program at HGM was expanded to include all newborns. Some NHS programs have been implemented in a few public and private hospitals around the country.
- Panama - since 2000, Panama has offered targeted NHS in some public and private birthing hospitals. There is no NHS law in place, but a local group is advocating for implementation of universal NHS.
- Puerto Rico - (Puerto Rico is a USA territory) and receives directives regarding health care initiatives from the U.S. government. An NHS program, Programa de Cernimiento Auditivo Neonatal Universal, operates in all birthing hospitals. The program was initiated in January 2000 and became required by law in December 2003.
- Uruguay - in 2000, Uruguay started implementing targeted and universal NHS in a limited number of public and private hospitals. Several hospitals in the capital city of Montevideo and one hospital in the city of Paysandú offer NHS.
- Ann Mary Augustine, Atanu Kumar Jana, Kurien Anil Kuruvilla, Sumita Danda, Anjali Lepcha, Jareen Ebenezer, Roshna Rose Paul, Amit Tyagi, Achamma Balraj Neonatal hearing screening--experience from a tertiary care hospital in southern India. Indian Pediatr: 2014, 51(3);179-83 PubMed 24277966
- Ruoyan Gai Tobe, Rintaro Mori, Lihui Huang, Lingzhong Xu, Demin Han, Kenji Shibuya Cost-effectiveness analysis of a national neonatal hearing screening program in China: conditions for the scale-up. PLoS ONE: 2013, 8(1);e51990 PubMed 23341887 | PLoS One.
- Anne R Synnes, Shelagh Anson, Julia Baum, Laurie Usher Incidence and pattern of hearing impairment in children with ≤ 800 g birthweight in British Columbia, Canada. Acta Paediatr.: 2012, 101(2);e48-54 PubMed 21824192
- Barbara Gerner de Garcia, Claudia Gaffney, Susan Chacon, Marcus Gaffney Overview of newborn hearing screening activities in Latin America. Rev. Panam. Salud Publica: 2011, 29(3);145-52 PubMed 21484013
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Cite this page: Hill, M.A. (2018, March 17) Embryology Hearing test. Retrieved from https://embryology.med.unsw.edu.au/embryology/index.php/Hearing_test
- © Dr Mark Hill 2018, UNSW Embryology ISBN: 978 0 7334 2609 4 - UNSW CRICOS Provider Code No. 00098G