Gas Supply, Demand and Middle Ear Gas Balance: Specific Aim 3c
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ClinicalTrials.gov Identifier: NCT00422851
: January 17, 2007
Last Update Posted
: November 13, 2017
University of Pittsburgh
National Institute on Deafness and Other Communication Disorders (NIDCD)
This study will determine if gas can pass between the environment and the middle ear by way of the eardrum. This route of gas exchange was observed in animals but has not been studied in humans. If gas exchange across the eardrum is documented and the rate is sufficiently high, this can help explain certain past observations such as why middle ear pressure does not change very much in some children and adults when they have a cold or flu. The investigators also expect that the rate of gas exchange across the eardrum will depend on whether or not the eardrum has scarred or abnormally thin regions.
Condition or disease
Middle-ear (ME) pressure is a measure of the number of contained gas moles, and processes that addd or remove gas moles from the relatively fixed volume ME cavity change its pressure. Experimental results from animal studies document significant gas exchange across the tympanic membrane and if confirmed for humans may explain some of the paradoxical findings for children with poor Eustachian tube function such as the preservation of an aerated ME when the normal routes of gas supply are disrupted. This study measures the rates of reactive and inert gas exchange across the adult tympanic membrane with and without structural abnormalities and determines if these transfers are purely diffusive phenomena. The resulting data will be used to develop species-specific rate-constants that will be used as parameters in modeling ME pressure regulation.
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Ages Eligible for Study:
18 Years to 50 Years (Adult)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
Adults 18-50 years old with at least one intact and effusion-free middle ear
18-50 years old
at least one intact and effusion-free middle ear
bilateral otitis media
unable to remain relaxed and quiet for up to 2 hours