EXPERIMENTAL STUDY ON THE ELECTRIC COCHLEAR RESPONSE AS AFFECTED BY THE APPLICATION OF POSITIVE PRESSURE IN THE MIDDLE EAR CAVITY, AS WELL AS A COMPARATIVE STUDY OF RESPONSES TO POSITIVE AND ENGATIVE PRESSURES

Acute middle ear (ME) and inner ear changes following brief unilateral phasic ME pressure changes (up to ± 6000/mm H2O) were studied in the guinea pig. Middle ear findings included perforation of the tympanic membrane, serous and serosanguinous exudate and hemorrhage of tympanic membrane and periosteal vessels. Changes were related to magnitude of applied pressure. Perforation and hemorrhage were more commonly seen with negative rather than positive pressure. Air bubbles behind the round window were seen with positive pressures. Occasional distortion, but never perforation of the round window, was noted. Hemorrhage of the scala tympani was observed with both positive and negative pressures; scala vestibuli hemorrhage was found with negative ME pressure. In some instances pressure direction and magnitude related changes were seen in the contralateral ear.

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Comparative Study of the Reconstruction of Articular Cartilage Defects with Free Costal Perichondrial Grafts and Free Tibial Periosteal Grafts: An Experimental Study on Rabbits

Calcified Tissue International ◽

10.1007/s002239900721 ◽

1999 ◽

Vol 65 (5) ◽

pp. 402-407 ◽

Cited By ~ 30

Author(s):

A. Carranza-Bencano ◽

M. Perez-Tinao ◽

P. Ballesteros-Vazquez ◽

J. R. Armas-Padron ◽

A. Hevia-Alonso ◽

...

Keyword(s):

Experimental Study ◽

Articular Cartilage ◽

Comparative Study ◽

Cartilage Defects ◽

Articular Cartilage Defects

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Pediatric middle ear cholesteatoma: the comparative study of congenital cholesteatoma and acquired cholesteatoma

European Archives of Oto-Rhino-Laryngology ◽

10.1007/s00405-015-3679-5 ◽

2015 ◽

Vol 273 (5) ◽

pp. 1155-1160 ◽

Cited By ~ 9

Author(s):

Yuka Morita ◽

Yutaka Yamamoto ◽

Shinsuke Oshima ◽

Kuniyuki Takahashi ◽

Sugata Takahashi

Keyword(s):

Comparative Study ◽

Middle Ear ◽

Congenital Cholesteatoma ◽

Middle Ear Cholesteatoma ◽

Acquired Cholesteatoma ◽

The Comparative Study

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Study of Toynbee Phenomenon by Combined Intranasopharyngeal and Tympanometric Measurements

Annals of Otology Rhinology & Laryngology ◽

10.1177/000348948809700220 ◽

1988 ◽

Vol 97 (2) ◽

pp. 199-206 ◽

Cited By ~ 9

Author(s):

Yehuda Finkelstein ◽

Yuval Zohar ◽

Yoav P. Talmi ◽

Nelu Laurian

Keyword(s):

Middle Ear ◽

Negative Pressure ◽

Pressure Change ◽

Positive Pressure ◽

New Information ◽

Pressure Changes ◽

Rapid Pressure

The Toynbee maneuver, swallowing when the nose is obstructed, leads in most cases to pressure changes in one or both middle ears, resulting in a sensation of fullness. Since first described, many varying and contradictory comments have been reported in the literature concerning the type and amount of pressure changes both in the nasopharynx and in the middle ear. In our study, the pressure changes were determined by catheters placed into the nasopharynx and repeated tympanometric measurements. New information concerning the rapid pressure variations in the nasopharynx and middle ear during deglutition with an obstructed nose was obtained. Typical individual nasopharyngeal pressure change patterns were recorded, ranging from a maximal positive pressure of + 450 to a negative pressure as low as −320 mm H2O.

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