Civil Aviation conform to the modern fast-paced way of life, so abundant are the purposes of income and more by air.
modern large amount of good to have an enclosed cockpit, aircraft movements in the cockpit when the relatively small changes in atmospheric pressure, and took off, landing of military aircraft, slower than the speed, flying more stable, so greatly reduce the pressure for change in The impact of our ears. Therefore, as long as to take appropriate protective measures, the general will not have a middle ear damage. But if Eryan Guan bad ventilation or do not pay attention to prevention, can also cause air otitis media.
aviation otitis media to know how the case is, first of all from the ears have to start with the anatomical structure. From the outer ear, middle ear and inner ear consists of three parts. In the middle ear and the nasopharynx between the Yi Wan-shaped and narrow channels, known as Eryan Guan , this opening at the end of Ergu room at the top of the anterior and lateral side openings in the nasopharynx Wall. Near-side attic cavity 1 / 3 of the stent loser for the bone near side of the nasopharynx 2 / 3 support for cartilage, the possession mucosal cavity with attic and nasopharyngeal mucosa connected. For a middle ear cavity containing the gas, the gap between lending eardrum and ear canal, which by Eryan Guan and nasopharyngeal the same, so Eryan Guan is the middle ear cavity with the outside world the only channel. Eryan Guan was usually closed, only under certain conditions before opening, and has the characteristics of the one-way valve.
Eryan Guan a middle ear cavity and the outside world to maintain the pressure balance and ruled out the function of the middle ear secretions. Eryan Guan ventilation function normally in good circumstances, which ear cavity pressure can be increased relatively open-Eryan Guan elected part of gas, so that the middle ear cavity internal and external pressures to achieve balance. But when the middle ear cavity pressure relatively low, outside a gas-Eryan Guan will not be able to enter the middle ear, then on to take the initiative to rely on action to make air ventilation into the middle ear, the eardrum to internal and external pressures to achieve balance.
atmospheric pressure, as the altitude increases reduced. In navigation, aircraft or land up, the cabin air pressure on the corresponding changes in the gas chamber of the gas expansion will result in or out. Eryan Guan ventilation function normally in good circumstances, or when the machine or down, by Eryan Guan and the regulation of artificial ventilation moves to take the initiative, we can maintain a balance between internal and external pressures eardrum, ear expansion at this time only minor flu or hearing impairment, But will not cause ear damage. If the middle ear cavity and outside pressure can not be quickly to strike a balance, it will generate syndrome, collectively referred to as trauma. Hurt the middle ear known as the aviation otitis media. If there are inflammatory swelling of the nasopharynx, or swelling of the gland or tumor suppressionEryan Guan openings plug, or when the aircraft up, down, without making active movements, such as ventilation, will be due to the impact of changes in atmospheric pressure, Eardrum caused by internal and external pressures imbalance, leading to the eardrum or Waitu down, then by plane to feel pain in the ears, at the same time with tinnitus, dizziness, nausea, vomiting and other symptoms, or even a bleeding eardrum.
