ACOUSTIC STAPEDIAL REFLEX THRESHOLD IN NORMAL HEARING PARTICIPANTS IN SULAIMANI CITY

Volume 11 , Issue 4 , December 2021 , Pages 443-454

Authors

Hiwa Asaad Abdulkareem 1

1 Department of Surgery, College of Medicine, University of Sulaimani, Kurdistan Region, Iraq.

DOI logo 10.17656/jsmc.10330

Keywords

Abstract

Background
Acoustic stapedial reflex threshold (ASRT) is an objective, important test that can be included in a test battery
along with behavioural pure tone audiometry and otoacoustic emissions to differentiate among middle ear,
cochlear, and retro cochlear sites of the lesion. It can be used as a cross-check with a behavioural audiogram to
increase confidence in the diagnosis. In most people with normal hearing thresholds and middle ear function,
the acoustic stapedial reflex will be present at all frequencies and within an intensity range of 70-90 dB HL
above the behavioural hearing threshold.
Objectives
To measure ASRT in participants with normal hearing thresholds in Sulaymaniyah city and to observe the
effect of different parameters on the threshold.
Patients and Methods
The study was conducted on 200 participants (400 ears) who met inclusion criteria (110 males and 90 females);
data were collected through visiting five different places with different age groups within three months
duration. Participants were divided into three age groups (6-12 years), (13-18 years), (19 years and above).
Only participants with normal otoscopic examination, normal pure tone audiometry, normal tympanogram,
undergone through stapedial reflex threshold measurement, and the reflexes were elicited and recorded
bilaterally by using tympanometer (Impedance meter) MAICO MI34 brand, single frequency 226 Hz of
German-made model 2011.
Results
Mean ASRT measured in both ears was within the normal range of 70-90 dB HL above hearing threshold
in both ipsilateral and contralateral pathways as Right ipsilateral (74.5 dB HL), right contralateral (76.9 dB
HL), left ipsilateral (74.6 dB HL), and left contralateral (76.8 dB HL) above hearing thresholds. There was no
significant difference between right and left ears according to ASRT (P-values > 0.05). There was no gender
effect on ASRT (P-values > 0.05), while there was a significant effect of age on ASRT, especially in the adult
population (P-values < 0.05).
Conclusion
A stapedial reflex threshold in normal hearing subjects was within normal range, different parameters as the
side of ear and gender did not affect the threshold. In contrast, with advancing age amount of intensity needed
to elicit the reflex increased.

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