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The Effects of Test Positions and Acoustic Stimulations on the Vestibular Evoked Myogenic Potentials
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Jin Dong Kim, Eui Kyung Goh, Young Ok Lee, Soo Keun Kong, Kyu Sup Cho, Kyong Myong Chon
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J Korean Bal Soc. 2007;6(1):21-28.
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 Abstract
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- Background and Objectives: Vestibular evoked myogenic potentials (VEMP) have become a good diagnostic tool to evaluate the integrity of the vestibulocollic reflex. To investigate the standard recording of VEMP response in normal hearing subjects, the authors studied the effects of test positions and different acoustic stimulations on the VEMP.
Subjects and Method: We performed VEMP on both ears of thirty normal hearing volunteers. Three acoustic stimulations (clicks and 500 Hz and 1,000 Hz short tone bursts) and four test positions were presented alternately to evoke VEMP. The latencies of peak p13 and n23, p13n23 interpeak latency (IPL) and amplitude were measured by EMG equipment and compared by statistical program. We also made up questions for the compliance of the test positions.
Results: The effects of test positions p13 latency had no significant difference on all test positions except between test position 2 and 4, n23 latency and p13n23 IPL had shortest waveform on test position 2, p13n23 amplitude had the largest waveform in test position 4. Acoustic stimulations on all test positions were influenced that clicks had shorter waveform about 2-3 ms than STBs on p13 latency and n23 latency, STBs had larger waveform than clicks on p13n23 amplitude. And the compliance of the test positions exhibited highest comfort in test position 1.
Conclusion: Test position 1 had higher VEMP response rates and compliance, 500 Hz STB had a largest p13n23 amplitude. Therefore we recommend that the ideal conditions were position 1 and 500 Hz STB for acoustic stimulations to evoke VEMP.
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Change of Otoacoustic Emissions in Early Stage of Meniere's Disease
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Jeong Hyug Ahn, Eui Kyung Goh, Se Joon Oh, Soo Keun Kong, Il Woo Lee, Kyong Myong Chon
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J Korean Bal Soc. 2006;5(1):15-20.
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Abstract
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- Background
and Objectives: To determine the clinical application of otoacoustic emissions (OAE) in screening of cochlear function, author studied changes of OAE in Meniere's disease patients.
Materials and Methods: The author has measured several parameters of OAE with 34 meniere's patients and 15 normal persons. Pass rate, response amplitude, reproducibility were recorded at TEOAE. Amplitude of DP-gram were measured at 2 F2 frequencies - 1000, 2000 Hz. The input/output functions of DPOAE were recorded at 2 F2 frequencies - 1001, 2002 Hz (respectively DP-1000, DP-2000). Input/output function were determined based on 2 parameters -maximal level and Detection threshold of DPOAE.
Results
1) TEOAE: Significant lower rate of positive finding was recorded at involved ears (55.8%, 19/34) than normal ears (100%, 30/30). 2) DP-gram: At frequency was 2000 Hz, amplitude of involved ears (n=28, 6.3±8.5dB/SPL) was significant smaller than normal ears (n=30, 6.3±8.5 dB/SPL). 3) DP-input/output function: At maximum DP level of DP-2000, response of involved ears (n=11, 51.6±7.9 dB/SPL) was significant larger than normal ears (n=22, 48.5±7.0 dB/SPL).
Conclusion
Parameters of OAE, such as pass rate of TEOAE, amplitude of DP-gram at 2000 Hz, and maximum DP level of DP-2000 was considered to good indicators for monitoring cochlear function of Meniere's disease. Furthermore, evaluation by changes in the TEOAE & DPOAE combined parameters, appeared to be very useful for detection of subtle change in cochlear function of Meniere's disease.
Key Words : Otoacoustic emissions, Meniere's disease
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