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ORIGINAL ARTICLE
VARIABILITY OF DISTORTION PRODUCT OTOACOUSTIC
EMISSIONS AT 10, 12, AND 16 KHZ: A PRELIMINARY
STUDY
1
Institute of Physiology and Pathology of Hearing, Warsaw, Poland
2
World Hearing Center, Nadarzyn, Kajetany, Poland
Publication date: 2014-12-31
Corresponding author
Edyta Piłka
Edyta Piłka, Department of Experimental Audiology, World Hearing Center, Institute of Physiology and Pathology of Hearing, Mokra 17 Str., 05-830 Nadarzyn, Kajetany, Poland, Tel: +48 22 35 60 359, Fax: +48 22 35 60 367, e-mail: e.pilka@ifps.org.pl
Edyta Piłka, Department of Experimental Audiology, World Hearing Center, Institute of Physiology and Pathology of Hearing, Mokra 17 Str., 05-830 Nadarzyn, Kajetany, Poland, Tel: +48 22 35 60 359, Fax: +48 22 35 60 367, e-mail: e.pilka@ifps.org.pl
J Hear Sci 2014;4(4):59-64
KEYWORDS
ABSTRACT
Background:
Distortion product otoacoustic emissions (DPOAEs) are usually measured up to 8 kHz. However some systems can measure DPOAEs up to 16 kHz. Therefore the aim of the study was to verify reliability of DPOAEs at 10, 12, and 16 kHz. The single- and multiple-fit options were compared.
Material and Methods:
DPOAEs were measured in subjects with normal hearing who had hearing thresholds better or equal to 25 dB HL for frequencies from 0.25 to 16 kHz. DPOAEs were measured at frequencies of 1, 2, 4, 6, 8, 10, 12, and 16 kHz. The main focus was on the 10–16 kHz range, while 1–8 kHz served as a comparison. Each recording session consisted of three measurements. The first two were made consecutively without taking out the probe – single-fit mode. The third measurement was made after taking out and refitting the probe – multiple-fit mode.
Results:
Results indicated that the inter-measurement variability was higher for frequencies in the 8–16 kHz range than in the 1–6 kHz range. Additionally, the variability was higher when multiple-fit was used compared to single-fit.
Conclusions:
Measurement of DPOAEs at frequencies higher than 8 kHz seems reliable; however, DPOAEs at these frequencies have greater variability than those at lower frequencies.
Distortion product otoacoustic emissions (DPOAEs) are usually measured up to 8 kHz. However some systems can measure DPOAEs up to 16 kHz. Therefore the aim of the study was to verify reliability of DPOAEs at 10, 12, and 16 kHz. The single- and multiple-fit options were compared.
Material and Methods:
DPOAEs were measured in subjects with normal hearing who had hearing thresholds better or equal to 25 dB HL for frequencies from 0.25 to 16 kHz. DPOAEs were measured at frequencies of 1, 2, 4, 6, 8, 10, 12, and 16 kHz. The main focus was on the 10–16 kHz range, while 1–8 kHz served as a comparison. Each recording session consisted of three measurements. The first two were made consecutively without taking out the probe – single-fit mode. The third measurement was made after taking out and refitting the probe – multiple-fit mode.
Results:
Results indicated that the inter-measurement variability was higher for frequencies in the 8–16 kHz range than in the 1–6 kHz range. Additionally, the variability was higher when multiple-fit was used compared to single-fit.
Conclusions:
Measurement of DPOAEs at frequencies higher than 8 kHz seems reliable; however, DPOAEs at these frequencies have greater variability than those at lower frequencies.
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