Vestibular Abnormality Clinical Trial
Official title:
Effects of Infrasound Exposure on Measures of Endolymphatic Hydrops
NCT number | NCT03132961 |
Other study ID # | 1701M04145 |
Secondary ID | |
Status | Terminated |
Phase | |
First received | |
Last updated | |
Start date | May 5, 2018 |
Est. completion date | August 23, 2018 |
Verified date | October 2018 |
Source | University of Minnesota - Clinical and Translational Science Institute |
Contact | n/a |
Is FDA regulated | No |
Health authority | |
Study type | Observational |
Persons exposed to infrasound - frequencies below 20 Hz - describe a variety of troubling audiovestibular symptoms, but the underlying mechanisms are not understood. Recent animal studies, however, provide evidence that short-term exposure to low frequency sound induces transient endolymphatic hydrops. The existence of this effect has not been studied in humans. The long-term objective of this research is to identify a possible mechanism to describe the effects of infrasound on the human inner ear. The central hypothesis of the proposed study is that short-term infrasound exposure induces transient endolymphatic hydrops in humans. This will be tested by performing electrophysiologic tests indicative of endolymphatic hydrops among normal hearing individuals before and immediately after a period of infrasound exposure. Recordings of infrasound generated by wind turbines in the field have been established and calibrated by this team of engineers, otologist, and hearing and balance scientists. An infrasound generator reproduces the acoustic signature based on these field recordings. Aim 1: Determine the effect of infrasound on the summating potential to action potential (SP/AP) ratio on electrocochleography (ECoG). Hypothesis 1: Infrasound exposure will cause a reversible elevation of the SP/AP ratio. Aim 2: Determine the effect of infrasound on the threshold response curves of ocular and cervical vestibular evoked myogenic potentials. (oVEMP and cVEMP). Hypothesis 2: Infrasound exposure will cause elevation of the oVEMP and cVEMP thresholds at the frequency of best response. Successful completion of the aims will provide evidence for a possible mechanism of the effect of infrasound on the inner ear. This understanding will benefit individuals exposed to environmental infrasound and those in regulatory, research, and advocacy roles when crafting interventions and future policy.
Status | Terminated |
Enrollment | 12 |
Est. completion date | August 23, 2018 |
Est. primary completion date | August 23, 2018 |
Accepts healthy volunteers | Accepts Healthy Volunteers |
Gender | All |
Age group | 18 Years to 60 Years |
Eligibility |
Inclusion Criteria: 1. Age of 18 to 60 years 2. Absence of otologic symptoms based on screening questionnaire 3. Normal otoscopic examination 4. Audiometric thresholds less than 25 dB at 250, 500, 750, 1000 Hz. Exclusion Criteria: 1. Age less than 18 or greater than 60 years. Age greater than 60 is considered an exclusion criterion as prior studies have demonstrated elevated VEMP thresholds attributed to age 2. Presence of any positive symptom on the questionnaire 3. Thresholds greater than 25 dB at the tested frequencies 4. Abnormal otoscopic examination (e.g., ear canal occlusion, tympanic membrane perforation, tympanic membrane retraction) 5. History of prior ear surgery. |
Country | Name | City | State |
---|---|---|---|
United States | University of Minnesota | Minneapolis | Minnesota |
Lead Sponsor | Collaborator |
---|---|
University of Minnesota - Clinical and Translational Science Institute |
United States,
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* Note: There are 28 references in all — Click here to view all references
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | Measure the effects of infrasound exposure on the SP/AP ratio of electrocochleography | A baseline ECoG recording will be obtained and the waveform's SP/AP ratio will be calculated and recorded (time "-10"). A 10-minute infrasound stimulus will ensue. Immediately following cessation of the stimulus (time 10), a repeat ECoG test run will be performed. A 10-minute recovery period will take place followed by a final ECoG test run (time 20). S/P ratios will be recorded for each test run and percent change will be calculated. | Test measurements at time -10, 10, and 20 minutes | |
Primary | Measure the effects of infrasound exposure on the threshold tuning curve of cVEMP | A baseline cVEMP tuning curve will be obtained and recorded (time "-10"). A 10-minute infrasound stimulus will ensue. Immediately following cessation of the stimulus (time 10), thresholds will be repeated. A 10-minute recovery period will take place followed by a final threshold measurement (time 20). Thresholds will be recorded for each test run and average change in threshold in dB will be calculated. | Test measurements at time -10, 10, and 20 minutes | |
Primary | Measure the effects of infrasound exposure on the threshold tuning curve of oVEMP | A baseline oVEMP tuning curve will be obtained and recorded (time "-10"). A 10-minute infrasound stimulus will ensue. Immediately following cessation of the stimulus (time 10), thresholds will be repeated. A 10-minute recovery period will take place followed by a final threshold measurement (time 20). Thresholds will be recorded for each test run and average change in threshold in dB will be calculated. | Test measurements at time -10, 10, and 20 minutes |
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