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Changes in the hearing thresholds of infants who failed the newborn hearing screening test and in infants treated in the neonatal intensive care unit.

Kang MY, Jeong SW, Kim LS - Clin Exp Otorhinolaryngol (2012)

Bottom Line: The aim of this study was to investigate changes in the hearing thresholds during the first year of life in infants who failed the newborn hearing screening (NHS) test and of infants treated in the neonatal intensive care unit (NICU).Of the 193 healthy infants who failed the NHS test, 60 infants (31%) had normal hearing acuity, 126 infants (65%) had sensorineural hearing loss (SNHL, ABR threshold ≥40 dB) and 7 infants (4%) had auditory neuropathy (AN).Irreversible intervention such as cochlear implantation should be considered with great caution within the first year after birth.

View Article: PubMed Central - PubMed

Affiliation: Department of Otolaryngology-Head and Neck Surgery, Dong-A University College of Medicine, Busan, Korea.

ABSTRACT

Objectives: The aim of this study was to investigate changes in the hearing thresholds during the first year of life in infants who failed the newborn hearing screening (NHS) test and of infants treated in the neonatal intensive care unit (NICU).

Methods: From March 2007 to November 2010, 193 healthy infants who failed the NHS test and 51 infants who were treated in the NICU were referred for evaluation of hearing acuity. Their hearing was evaluated using impedance audiometry, auditory brainstem response (ABR), and otoacoustic emission before 6 months of age, and follow-up hearing tests were administered before 12 months of age. Changes in their hearing thresholds were then analyzed.

Results: Of the 193 healthy infants who failed the NHS test, 60 infants (31%) had normal hearing acuity, 126 infants (65%) had sensorineural hearing loss (SNHL, ABR threshold ≥40 dB) and 7 infants (4%) had auditory neuropathy (AN). On the follow-up hearing tests, which were conducted in 65 infants, 6 infants showed a hearing threshold deterioration of more than 20 dB, and 19 infants showed a hearing threshold improvement of more than 20 dB. Of the 51 infants who were treated in the NICU, 38 infants (75%) had normal hearing acuity, 12 infants (24%) had SNHL, and one infant (2%) had AN. In the follow-up hearing tests, which were performed in 13 infants, one infant with normal hearing progressed to severe hearing loss. Five infants who had SNHL showed a hearing threshold improvement of more than 20 dB, and 4 infants recovered to normal hearing.

Conclusion: The hearing thresholds of infants with congenital SNHL can change during the first year of life; therefore, the importance of administration of follow-up hearing tests is emphasized. Irreversible intervention such as cochlear implantation should be considered with great caution within the first year after birth.

No MeSH data available.


Related in: MedlinePlus

Change in hearing thresholds of an infant with congenital cytomegalovirus infection. Initial auditory brainstem response (ABR) revealed normal hearing thresholds of 20 dBnHL for both ears. Follow-up ABR showed elevation of hearing thresholds to 70 and 80 dBnHL for both ears, respectively.
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Figure 4: Change in hearing thresholds of an infant with congenital cytomegalovirus infection. Initial auditory brainstem response (ABR) revealed normal hearing thresholds of 20 dBnHL for both ears. Follow-up ABR showed elevation of hearing thresholds to 70 and 80 dBnHL for both ears, respectively.

Mentions: Delayed hearing loss and progressive hearing loss are well-known in infants with risk factors for hearing loss (17, 18). The presence of risk factors increases the possibility of delayed hearing loss to about tenfold (19). Therefore, even if normal hearing is confirmed in the initial hearing test, follow-up tests should be performed for infants with risk factors. In this study, we were able to perform follow-up hearing tests only in 7% (n=7) of the infants who had normal hearing in the initial diagnostic hearing test. Of these, one infant with congenital cytomegalovirus infection showed deteriorated hearing of 70 and 80 dBnHL in each ear in follow-up hearing tests (Fig. 4). Furthermore, six healthy infants who were diagnosed as having SNHL in the initial hearing test showed hearing threshold deterioration of more than 20 dB, and a few infants with mild to moderate hearing loss progressed to severe hearing loss, revealing their candidacy for CI. These findings demonstrates the importance of conducting further hearing tests to examine the presence of delayed hearing loss and progressive hearing loss in healthy infants with SNHL as well as infants with risk factors for hearing loss.


Changes in the hearing thresholds of infants who failed the newborn hearing screening test and in infants treated in the neonatal intensive care unit.

Kang MY, Jeong SW, Kim LS - Clin Exp Otorhinolaryngol (2012)

Change in hearing thresholds of an infant with congenital cytomegalovirus infection. Initial auditory brainstem response (ABR) revealed normal hearing thresholds of 20 dBnHL for both ears. Follow-up ABR showed elevation of hearing thresholds to 70 and 80 dBnHL for both ears, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3369979&req=5

Figure 4: Change in hearing thresholds of an infant with congenital cytomegalovirus infection. Initial auditory brainstem response (ABR) revealed normal hearing thresholds of 20 dBnHL for both ears. Follow-up ABR showed elevation of hearing thresholds to 70 and 80 dBnHL for both ears, respectively.
Mentions: Delayed hearing loss and progressive hearing loss are well-known in infants with risk factors for hearing loss (17, 18). The presence of risk factors increases the possibility of delayed hearing loss to about tenfold (19). Therefore, even if normal hearing is confirmed in the initial hearing test, follow-up tests should be performed for infants with risk factors. In this study, we were able to perform follow-up hearing tests only in 7% (n=7) of the infants who had normal hearing in the initial diagnostic hearing test. Of these, one infant with congenital cytomegalovirus infection showed deteriorated hearing of 70 and 80 dBnHL in each ear in follow-up hearing tests (Fig. 4). Furthermore, six healthy infants who were diagnosed as having SNHL in the initial hearing test showed hearing threshold deterioration of more than 20 dB, and a few infants with mild to moderate hearing loss progressed to severe hearing loss, revealing their candidacy for CI. These findings demonstrates the importance of conducting further hearing tests to examine the presence of delayed hearing loss and progressive hearing loss in healthy infants with SNHL as well as infants with risk factors for hearing loss.

Bottom Line: The aim of this study was to investigate changes in the hearing thresholds during the first year of life in infants who failed the newborn hearing screening (NHS) test and of infants treated in the neonatal intensive care unit (NICU).Of the 193 healthy infants who failed the NHS test, 60 infants (31%) had normal hearing acuity, 126 infants (65%) had sensorineural hearing loss (SNHL, ABR threshold ≥40 dB) and 7 infants (4%) had auditory neuropathy (AN).Irreversible intervention such as cochlear implantation should be considered with great caution within the first year after birth.

View Article: PubMed Central - PubMed

Affiliation: Department of Otolaryngology-Head and Neck Surgery, Dong-A University College of Medicine, Busan, Korea.

ABSTRACT

Objectives: The aim of this study was to investigate changes in the hearing thresholds during the first year of life in infants who failed the newborn hearing screening (NHS) test and of infants treated in the neonatal intensive care unit (NICU).

Methods: From March 2007 to November 2010, 193 healthy infants who failed the NHS test and 51 infants who were treated in the NICU were referred for evaluation of hearing acuity. Their hearing was evaluated using impedance audiometry, auditory brainstem response (ABR), and otoacoustic emission before 6 months of age, and follow-up hearing tests were administered before 12 months of age. Changes in their hearing thresholds were then analyzed.

Results: Of the 193 healthy infants who failed the NHS test, 60 infants (31%) had normal hearing acuity, 126 infants (65%) had sensorineural hearing loss (SNHL, ABR threshold ≥40 dB) and 7 infants (4%) had auditory neuropathy (AN). On the follow-up hearing tests, which were conducted in 65 infants, 6 infants showed a hearing threshold deterioration of more than 20 dB, and 19 infants showed a hearing threshold improvement of more than 20 dB. Of the 51 infants who were treated in the NICU, 38 infants (75%) had normal hearing acuity, 12 infants (24%) had SNHL, and one infant (2%) had AN. In the follow-up hearing tests, which were performed in 13 infants, one infant with normal hearing progressed to severe hearing loss. Five infants who had SNHL showed a hearing threshold improvement of more than 20 dB, and 4 infants recovered to normal hearing.

Conclusion: The hearing thresholds of infants with congenital SNHL can change during the first year of life; therefore, the importance of administration of follow-up hearing tests is emphasized. Irreversible intervention such as cochlear implantation should be considered with great caution within the first year after birth.

No MeSH data available.


Related in: MedlinePlus