Abdullah, Rosninda
(2015)
The use of ipsilateral and contralaterial recording of post-auricular muscle response in predicting hearing level.
Masters thesis, Universiti Sains Malaysia.
Abstract
Ipsilateral and contralateral recording of tone burst evoked post-auricular muscle
response (PAMR) were recorded in 55 adults (20 with normal hearing, 15 with
conductive hearing loss and 20 with sensorineural hearing loss) to investigate the use
of PAMR in predicting hearing level. In the first phase of this study, ipsilateral
PAMR were elicited with three stimulus rates (6, 11 and 17/s) at several intensity
levels (60, 40, 20 dB SL and at thresholds level) and at four octave frequencies (500,
1000, 2000 and 4000 Hz). In the second phase, thresholds level of ipsilateral and
contralateral recordings of PAMR were recorded in normal, conductive and
sensorineural hearing loss group. The findings of the first phase showed most of the
PAMR were biphasic with the first peak latency of between 13.1 and 17.7 ms, while
the second peak latency occurred between 16.7 and 22.2 ms, depending on the
stimulus intensity, tone burst frequency, and post auricular muscle tone. There were
no significant difference of PAMR peaks components (latency and amplitude) as the
stimulus rates increased from 6 to 17/s (P>0.05), except at 500 Hz (P=0.03). The
correlation analysis showed the best correlation value between PAMR and PTA
thresholds at stimulus rate of 11/s (ICC=0.62-0.82) at frequency of 500, 1000 and
4000 Hz. In the second phase, the correlation between PAMR and PTA thresholds
were the highest in SNHL group (ICC=0.81-0.93), followed by CHL group
(ICC=0.77-0.94) and normal hearing group. Statistically, contralateral recording of
PAMR showed lower thresholds than ipsilateral recording, particularly at higher
frequencies. To conclude, the hearing thresholds obtained by PAMR were within 20
dB SL across the test frequencies with better estimates at the higher tone burst
frequency (4 kHz) for both modes of stimulation (ipsilateral and contralateral). The
findings of the current study demonstrate the ability of PAMR in predicting
behavioural hearing levels among normal and hearing impaired adults.
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