Vestibular and Clinical Reaction to Middle Ear Pressure Changes

2015 ◽  
pp. 61-67
Author(s):  
�. Tjernstr�m
Keyword(s):  
Middle Ear ◽  
Clinical Reaction ◽  
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.

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

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 Changes during Balloon Eustachian Tuboplasty

2016 ◽  
Vol 156 (1) ◽  
pp. 161-165 ◽  
Author(s):  
Matthew E. Smith ◽  
James R. Tysome
Keyword(s):  
Middle Ear ◽  
Balloon Catheter ◽  
Pressure Change ◽  
Tertiary Referral ◽  
Tertiary Referral Center ◽  
Middle Ear Pressure ◽  
Tube Dysfunction ◽  
Fresh Frozen ◽  
Balloon Eustachian Tuboplasty ◽  
Pressure Changes

Objective Balloon eustachian tuboplasty (BET) has entered clinical use as a treatment for eustachian tube dysfunction. Some surgeons perform myringotomy prior to BET due to concerns that the increase in middle ear (ME) pressure caused by BET may cause otic barotrauma. We investigated the ME pressure changes occurring during BET in cadavers. Study design Human cadaver investigation of a surgical technique Setting Laboratory study at a tertiary referral center. Subjects and Methods ME pressures were recorded from fresh-frozen cadavers, and BET was performed with the Bielefeld balloon catheter inflated to 10 bar. Peak ME pressures were recorded during catheter insertion, inflation, deflation, and removal. A second pressure measurement was taken 15 seconds after each stage to assess the residual pressures. All BET procedures were repeated at least once. Where transmastoid recordings were made, BET was repeated, measuring pressure via a myringotomy to ensure equivalence. Results Data from 25 procedures in 13 ears (9 heads) were analyzed. A consistent pattern of ME pressure change was observed in all cases. Positive pressures occurred on insertion (maximum, 26 daPa) and inflation (maximum, 99 daPa) and negative pressures on deflation (maximum, –46 daPa) and removal (maximum, –42 daPa). There were no significant pressure differences between first and second procedures, except at 15 seconds after insertion ( P = .04). Conclusion In adult cadaveric specimens, BET induces ME pressures within the normal physiologic range. On this basis, routine myringotomy prior to BET in adults is not necessary.

Detection of tympanic membrane movement using film patch with integrated strain gauge, assessed by optical coherence tomography: experimental study

2011 ◽  
Vol 125 (5) ◽  
pp. 467-473 ◽  
Author(s):  
T Just ◽  
T Zehlicke ◽  
O Specht ◽  
W Sass ◽  
C Punke ◽  
...  
Keyword(s):  
Experimental Study ◽  
Optical Coherence Tomography ◽  
Tympanic Membrane ◽  
Middle Ear ◽  
Strain Gauge ◽  
Ex Vivo ◽  
Optical Coherence ◽  
Middle Ear Pressure ◽  
Pressure Changes

AbstractObjective:We report an ex vivo and in vivo experimental study of a device designed to measure tympanic membrane movement under normal and pathological conditions, assessed using optical coherence tomography.Materials and methods:We designed two types of flexible, round film patch with integrated strain gauge, to be attached to the tympanic membrane in order to measure tympanic membrane movement. Tympanic membrane attachment was assessed using optical coherence tomography. The devices were tested experimentally using an ex vivo model with varying middle-ear pressure.Results:Optical coherence tomography reliably assessed attachment of the film patch to the tympanic membrane, before and after middle-ear pressure changes. Strain gauge voltage changes were directly proportional to middle-ear pressure recordings, for low pressure changes. Tympanic membrane perforations smaller than 2 mm could be sealed off with the film patch.Conclusion:Attachment of the film patch with integrated strain gauge to the tympanic membrane was not ideal. Nevertheless, the strain gauge was able to precisely detect small pressure changes within the middle ear, in this experimental model.

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