Gas Ventilation Through Middle Ear Mucosa

Ohno, Fumio; Imakiire, Taijiro; Nobori, Takuo; Ohyama, Masaru

doi:10.3950/jibiinkoka.96.1861

Cited by 2 publications

(1 citation statement)

References 10 publications

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“…Those other gases tend to move from the ME to the blood according to their partial pressure gradient between the ME and the blood, but the velocities of their movement are much slower than that of nitrous oxide. As a result, the ME pressure increases 7,8 . Although the manner of the transition is different between oxygen, carbon dioxide (diffusion‐dependent), and nitrogen(perfusion‐dependent), 9 there has been no active selectivity reported in the tissues such as capillary wall or mucosa in terms of gas transition.…”

Section: Discussionmentioning

confidence: 99%

Gas Exchange Function Through the Mastoid Mucosa in Ears After Surgery

et al. 1997

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Gas exchange function through the mastoid mucosa was investigated in ears after surgery using nitrous oxide. Increase in the mastoid pressure was assessed by a micropressure sensor placed in the mastoid cavity during the second-stage revision operation performed under general anesthesia using 67% nitrous oxide, 33% oxygen, and sevoflurane on 14 ears with chronic adhesive otitis media or cholesteatoma as well as on seven ears without inflammation as controls. All seven control ears showed pressure increase in the mastoid in various degrees. In the 14 postoperative ears, nine of the 10 ears on which the mastoid mucosa had previously been able to be preserved in various degrees showed pressure increase in the mastoid, but none of the remaining four ears, which had previously had mastoidectomy, showed any pressure increase. The presence or absence of the mastoid pressure increase of those ears was also found to be correlated well with the presence or absence of mastoid aeration on computed tomography examined just before the second-stage operation. These results appear to indicate that, in ears after surgery, recovery of both the gas exchange function and aeration in the mastoid is expected only when the mastoid mucosa can be preserved even partially.

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Section: Discussionmentioning

confidence: 99%

Gas Exchange Function Through the Mastoid Mucosa in Ears After Surgery

et al. 1997

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Gas exchange function of the middle ear in patients with otitis media with effusion

Tanabe

Takahashi

Honjo

et al. 1997

Eur Arch Otorhinolaryngol

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Gas exchange function through the middle ear mucosa was assessed using nitrous oxide (N2O) in patients with otitis media with effusion (OME), as well as in normal ears during elective surgery for unrelated disorders. In all normal ears except one (n = 43), an increase in pressure was observed after N2O inhalation. In 42 of 84 ears with OME, a pressure increase was observed, but not in the remaining 42 ears (50%), indicating that the gas exchange function in these latter ears was impaired. In 21 of the 42 ears showing no middle ear pressure increase following N2O inhalation, the middle ear pressure was again monitored after myringotomy and aspiration of the effusion A pressure increase was found in 16 ears, indicating that the impairment in gas exchange function in ears with OME may be reversible in most cases. Computed tomography of the mastoid was examined preoperatively in 66 ears, with the presence or absence of a middle ear pressure change well correlated in 57 ears with the presence or absence of mastoid aeration.

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Gas Ventilation Through Middle Ear Mucosa

Cited by 2 publications

References 10 publications

Gas Exchange Function Through the Mastoid Mucosa in Ears After Surgery

Gas Exchange Function Through the Mastoid Mucosa in Ears After Surgery

Gas exchange function of the middle ear in patients with otitis media with effusion

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