Ali, Ahmad Hafiz
(2018)
Early detection of extended high frequency sensorineural hearing loss in chronic suppurative otitis media using extended high frequency pure tone audiometry.
Masters thesis, Universiti Sains Malaysia.
Abstract
Objective : The relationship between chronic suppurative otitis media with sensorineural
hearing loss is still debatable. The availability of extended high frequency pure tone audiometry
evaluation makes the detection of extended high frequency sensorineural hearing loss possible
at much earlier stage. Thus, the aim for this study is to look for the prevalence of extended high
frequency sensorineural hearing loss in chronic suppurative otitis media and the association
between duration of the disease with extended high frequency sensorineural hearing loss.
Design : One hundred and twenty chronic suppurative otitis media ears and one hundred and
twenty normal ears for control group who never have history of ear problem before were
enrolled in this study. All participants age 11 till 50 years old, who previously had a normal
bone conduction threshold using conventional pure tone audiometry (frequency 250Hz. 500Hz,
1kHz, 2kHz, 4kHz and 8kHz) underwent examination using otoscopy, microscope and
extended high frequency pure tone audiometry evaluation. Extended high frequency pure tone
audiometry evaluation at frequency 9kHz, 10kHz, 11.2kHz, 12.5kHz, 14kHz and 16kHz were
done in a sound proof cabin, which is located in a sound treated room. The average hearing
threshold of all extended high frequencies will be taken as degree of hearing loss. Any hearing
threshold at 25dB or more were taken as present of extended high frequency sensorineural
hearing loss, following World Health Organization degree of hearing loss. The degree of
extended high frequency sensorineural hearing loss will be graded into normal, mild, moderate,
moderately severe, severe and profound. Data were analyzed using SPSS version 22 and
STATA version 11.0.Result : Prevalence of extended high frequency sensorineural hearing loss in chronic
suppurative otitis media group were 78.3% and in control group were 26.2%. There was a
highly significant association between chronic suppurative otitis media, patient’s age and
duration of the disease with extended frequency sensorineural hearing loss (p-value < 0.001).
Result also showed the longer the duration of chronic suppurative otitis media, the more severe
the degree of extended high frequency sensorineural hearing loss.
Conclusion: Extended high frequency audiometry test is very useful in detecting early
extended high frequency sensorineural hearing loss in chronic suppurative otitis media. This
test should be regularly done in chronic suppurative otitis media cases to prevent further
worsening of the irreversible sensorineural hearing loss and early prevention can be taken.
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