scholarly journals Cochlear‐Microphonic and Middle‐Ear Pressure Changes during Nitrous Oxide Anesthesia in Cats

1972 ◽  
Vol 51 (4B) ◽  
pp. 1367-1369 ◽  
Author(s):  
A. Starr ◽  
P. Schwartzkroin
Keyword(s):  
Nitrous Oxide ◽  
Middle Ear ◽  
Cochlear Microphonic ◽  
Middle Ear Pressure ◽  
Pressure Changes ◽  
Oxide Anesthesia

Middle Ear Pressure Changes During Anesthesia With or Without Nitrous Oxide are Similar Among Airway Devices

2006 ◽  
Vol 102 (1) ◽  
pp. 319-321 ◽  
Author(s):  
Mathias Hohlrieder ◽  
Christian Keller ◽  
Joseph Brimacombe ◽  
Stephan Eschertzhuber ◽  
G??nter Luckner ◽  
...  
Keyword(s):  
Nitrous Oxide ◽  
Middle Ear ◽  
Middle Ear Pressure ◽  
Airway Devices ◽  
Pressure Changes

Investigation of Middle Ear Pressure Changes During Prone Position Under General Anesthesia Without Using Nitrous Oxide

2013 ◽  
Vol 24 (6) ◽  
pp. 1950-1952 ◽  
Author(s):  
Semih Degerli ◽  
Baran Acar ◽  
Mehmet Sahap ◽  
Aytac Polat ◽  
Eyup Horasanli
Keyword(s):  
Nitrous Oxide ◽  
General Anesthesia ◽  
Prone Position ◽  
Middle Ear ◽  
Middle Ear Pressure ◽  
Pressure Changes

Anatomical Effects of Sudden Middle Ear Pressure Changes

1979 ◽  
Vol 88 (3) ◽  
pp. 368-376 ◽  
Author(s):  
A. Axelsson ◽  
J. Miller ◽  
M. Silverman
Keyword(s):  
Tympanic Membrane ◽  
Middle Ear ◽  
Round Window ◽  
Applied Pressure ◽  
Positive Pressure ◽  
Air Bubbles ◽  
Scala Tympani ◽  
Middle Ear Pressure ◽  
Contralateral Ear ◽  
Pressure Changes

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.

scholarly journals Tympanometric changes following adenoidectomy in children with adenoid hypertrophy

2018 ◽  
Vol 4 (2) ◽  
pp. 391 ◽  
Author(s):  
Rashmi P. Rajashekhar ◽  
Vinod V. Shinde
Keyword(s):  
Otitis Media ◽  
Eustachian Tube ◽  
Middle Ear ◽  
Otitis Media With Effusion ◽  
Maximum Size ◽  
Adenoid Hypertrophy ◽  
Tube Obstruction ◽  
Media Type ◽  
Middle Ear Pressure ◽  
Pressure Changes

<p class="abstract"><strong>Background:</strong> Adenoid Hypertrophy is the commonest disorder in children. The size of adenoids varies from child to child and also in the same individual as he grows and attains maximum size between age of 3 to 7 years. Adenoid hypertrophy plays a significant role in the pathogenesis of otitis media with effusion. Our objective was to study the tympanogram changes following adenoidectomy. i.e to find out the effect  of  adenoidectomy on Otitis Media with Effusion.</p><p class="abstract"><strong>Methods:</strong> Patients showing &gt;50% of airway obstruction by the adenoids were included in the study. 20 patients with adenoid hypertrophy underwent adenoidectomy. Pre-operative and postoperative tympanograms of 40 ears were studied.  </p><p class="abstract"><strong>Results:</strong> Type A curve (normal) was found in 12 ears. Type B Flat tympanogram – 12 ears s/o Gross Serous Otitis Media. Type C tympanogram – 8 ears s/o uncomplicated eustachian tube obstruction. 5 ears showed tympanogram s/o Eustachian tube block without significant collection of middle ear fluid. 3 ears showed tympanogram s/o uncomplicated eustachian tube obstruction. Post adenoidectomy, 32 ears showed normal tympanogram. 8 ears showed tympanogram s/o negative middle ear pressure with normal compliance.</p><p class="abstract"><strong>Conclusions:</strong> Our study shows high prevalence of Otitis Media with Effusion in patients with adenoid hypertrophy. Otitis Media with Effusion is treated by adenoidectomy in most of the patients which is confirmed by post adenoidectomy tympanogram. Also, problem of decreased attention in school due to reduced hearing secondary to OME can be corrected by adenoidectomy. Hence, all patients should undergo pre and post-adenoidectomy tympanometry to know the compliance and pressure changes in the middle ear.</p>

Middle Ear Pressure Variation: Effect of Nitrous Oxide

1997 ◽  
Vol 107 (3) ◽  
pp. 357-363 ◽  
Author(s):  
Kathleen Chinn ◽  
Orval E. Brown ◽  
Scott C. Manning ◽  
Carl C. Crandell
Keyword(s):  
Nitrous Oxide ◽  
Middle Ear ◽  
Pressure Variation ◽  
Middle Ear Pressure
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