Inverted caloric nystagmus of perforated ears upon air caloric stimusation
| Autor: | Chiaki Koide |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
Adult
Male Cold stimulation medicine.medical_specialty Tympanic Membrane Adolescent Stimulation Body Temperature Caloric Nystagmus Myringoplasty Nystagmus Physiologic Caloric Tests otorhinolaryngologic diseases medicine Humans Tympanic cavity Ear canal Child Caloric stimulation Tympanic Membrane Perforation business.industry Anatomy Middle Aged Surgery Otitis Media medicine.anatomical_structure Otorhinolaryngology Chronic Disease Female sense organs business |
| Zdroj: | Nippon Jibiinkoka Gakkai Kaiho. 94:377-385 |
| ISSN: | 1883-0854 0030-6622 |
| Popis: | It is well known that inverted caloric nystagmus is seen during air caloric testing in cases of chronic otitis media. The mechanism of inversion and its clinical significance are discussed here. Temperature changes in the tympanic cavity and external ear canal were measured with a microthermister and a digital tester in seventeen ears with tympanic membrane perforation, during bithermal air caloric testing. The tympanic cavity mucosa was cooled by hot stimulation because of the evaporation of heat. When the perforation was closed or humidified air was used, the tympanic cavity mucosa was not cooled by hot stimulation and the inverted caloric nystagmus changed to a normal response. Inverted caloric nystagmus occurred in 30.4% of 335 ears affected by chronic otitis media with perforation. Inverted caloric nystagmus occurred in 90 ears with hot stimulation and in 12 ears with cold stimulation. Inverted caloric nystagmus turned to normal response after myringoplasty in all of 10 ears. The cooling effect caused by evaporation of water from the moist middle ear mucosa during dry air blowing and direct thermal conduction to the vestibulum through a perforation of the ear drum and inversion of the endolymphatic convection seemed to cause the inversion. |
| Databáze: | OpenAIRE |
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