We have located links that may give you full text access.
Three-dimensional wideband absorbance immittance findings in young adults with large vestibular aqueduct syndrome.
Laryngoscope Investigative Otolaryngology 2023 Februrary
OBJECTIVE: To investigate the effect of large vestibular aqueduct syndrome (LVAS) on middle ear sound transmission using wideband absorbance immittance (WAI).
METHODS: WAI results from young adult LVAS patients and normal adults were compared.
RESULTS: Averaged energy absorbance (EA) at ambient and peak pressure in the LVAS group showed differences to the normal group. Under ambient pressure, the average EA of the LVAS group was significantly higher than the normal group at frequencies 472-866 Hz and 6169-8000 Hz ( p < .05) and lower at frequencies 1122-2520 Hz ( p < .05). Under peak pressure, absorbance was increased at frequencies 515-728, 841, and 6169-8000 Hz ( p < .05) and decreased at 1122-1374 Hz and 1587-2448 Hz ( p < .05). An investigation into the effect of external auditory canal pressure on EA across frequencies in the pressure-frequency domain, showed that EA differed significantly in the low-frequency region of 707and 1000 Hz from 0 to 200 daPa and 500 Hz at 50 daPa ( p < .05). There was also a significant difference in EA between the two groups at 8000 Hz ( p < .05) in the pressure range -200-300 daPa.
CONCLUSION: WAI is a valuable tool to measure the effect of LVAS on middle ear sound transmission. LVAS has a significant effect on EA at low and mid frequencies under ambient pressure, while the frequencies affected are mainly at low frequencies when positive pressure is presented.
LEVEL OF EVIDENCE: Level 3a.
METHODS: WAI results from young adult LVAS patients and normal adults were compared.
RESULTS: Averaged energy absorbance (EA) at ambient and peak pressure in the LVAS group showed differences to the normal group. Under ambient pressure, the average EA of the LVAS group was significantly higher than the normal group at frequencies 472-866 Hz and 6169-8000 Hz ( p < .05) and lower at frequencies 1122-2520 Hz ( p < .05). Under peak pressure, absorbance was increased at frequencies 515-728, 841, and 6169-8000 Hz ( p < .05) and decreased at 1122-1374 Hz and 1587-2448 Hz ( p < .05). An investigation into the effect of external auditory canal pressure on EA across frequencies in the pressure-frequency domain, showed that EA differed significantly in the low-frequency region of 707and 1000 Hz from 0 to 200 daPa and 500 Hz at 50 daPa ( p < .05). There was also a significant difference in EA between the two groups at 8000 Hz ( p < .05) in the pressure range -200-300 daPa.
CONCLUSION: WAI is a valuable tool to measure the effect of LVAS on middle ear sound transmission. LVAS has a significant effect on EA at low and mid frequencies under ambient pressure, while the frequencies affected are mainly at low frequencies when positive pressure is presented.
LEVEL OF EVIDENCE: Level 3a.
Full text links
Related Resources
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app
All material on this website is protected by copyright, Copyright © 1994-2024 by WebMD LLC.
This website also contains material copyrighted by 3rd parties.
By using this service, you agree to our terms of use and privacy policy.
Your Privacy Choices 
You can now claim free CME credits for this literature searchClaim now
Get seemless 1-tap access through your institution/university
For the best experience, use the Read mobile app