These tools will no longer be maintained as of December 31, 2024. Archived website can be found here. PubMed4Hh GitHub repository can be found here. Contact NLM Customer Service if you have questions.


Pubmed for Handhelds

PUBMED FOR HANDHELDS

Search MEDLINE/PubMed

  • Title: Otoacoustic emissions growth rate threshold: distortion product in neonates.
    Author: Almeida PP, Sanches SG, Carvallo RM.
    Journal: Pro Fono; 2010; 22(4):409-14. PubMed ID: 21271091.
    Abstract:
    BACKGROUND: Distortion product otoacoustic emission measures (DPOAE) verifies, among other characteristics, the emergence and growth rate of the DPOAE response according to sound stimulus intensity (growth curve). AIM: To estimate the DPOAE threshold in neonates according to the DPOAE growth curve at 2 kHz and 4 kHz, with stimulus presentation ranging between 35 and 70 dB SPL. METHOD: Participants were 51 neonates, with 24 to 84 hours of life and with no indication of risk for hearing impairment. The DPOAE were registered in the growth curve function at 2 kHz and at 4 kHz. Neonates were evaluated during the period of hospital stay, after birth. Three possible thresholds were considered (LIM 1, LIM 2 and LIM 3) based on the presence of response at 3 dB SPL in the signal to noise ratio. RESULTS: The average thresholds intensities ranged from 47.55 to 49.85 dB at 2 kHz and from 55.52 to 59.94 dB at 4 kHz. The mean amplitude response ranged from 6.67 to 8.27 dB at 2 kHz and from 6.99 to 11.35 dB at 4 kHz. There was significant difference between the three thresholds for the two studied frequencies. CONCLUSION: The procedure was feasible for the neonatal population revealing mean thresholds of up to 60 dB for both frequencies. Even though participants presented elevated thresholds, robust amplitude responses were observed.
    [Abstract] [Full Text] [Related] [New Search]