Musa, Zalilah
(2015)
Determination of normative data on non invasive electrocochleography test in Malaysian adults.
Masters thesis, Universiti Sains Malaysia.
Abstract
Objective
The study was conducted with the aim to obtain normative data of Electrocochleography
(EcochG) among Malaysian adults. It is also done to compare EcochG outcomes amplitude
of summating potential (SP), action potential (AP) and SP/AP ratio between two different
placements of EcochG electrode at the upper part of tympanic membrane and lower part of
tympanic membrane and the difference between male and female.
Methodology
This is a cross sectional study conducted at audiology clinic HUSM starting from November
2011 until June 2012. 30 adults who consist of HUSM staffs aged 18 to 50 years old were
chosen using simple random sampling method. Subjects were confirmed to have no
pathological ear by otoscopy and have normal hearing level on pure tone audiometry
(PTA).Tympanic electrode by Biologics was used. The gel is applied at its tip prior to insertion.
With the help of head light,the electrode is introduced firstly at upper part of tympanic
membrane until subject feels that it touches the membrane with the placement of insert
earphone below the electrode. Broadband alternating clicks 95 dBHL at 7.1/s is given to the
patient and result recorded. After recording of upper placement finished, the electrode is then
placed at lower part of tympanic membrane with the insert earphone above it. Same stimulus
given and result recorded.
Results
EcochG data between males and females are combined because there was no significant
difference between them ( p > 0.05 ). The mean SP/AP ratio is 0.31 for upper TM placement
and 0.30 for lower TM placement. The mean for AP are 0.72uVand 0.66uV for upper TM
and lower TM respectively where as mean SP is 0.23uV for upper TM and 0.20uV for lower
TM.
Conclusion
The normative data for EcochG parameters were obtained. The mean for AP, SP and
SP/AP ratios are 0.69u ,0.21uV and 0.31 respectively. There was no difference in EcochG
reading of right and left ear between two different placements of tymptrode with p value of
0.49 (p > 0.05). There was also no difference in EcochG parameters between male and female
with p value of 0.96 ( p > 0.05 ).
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