Drettner B, Aust R
Acta Otolaryngol. 1977 Jan-Feb;83(1-2):16-9. doi: 10.3109/00016487709128804.
The maxillary ostium is narrower when the subject is recumbent than when sitting. The oxygen content in the sinus is related to the patency of the ostium and to some extent to its size. A 90% gas exchange in the sinus normally requires only 5 minutes. The exchange is faster during nasal than during oral breathing. The mucosa of the maxillary sinus has a relatively high blood flow. Oxygen absorption by the mucosa is normally perfusion limited. A considerable part of the absorbed oxygen is utilized directly by the mucosa and not taken up by the blood flow.
上颌窦口在受试者卧位时比坐位时更窄。窦腔内的氧气含量与窦口的通畅程度有关，在一定程度上也与其大小有关。窦腔内90%的气体交换通常仅需5分钟。经鼻呼吸时的气体交换比经口呼吸时更快。上颌窦黏膜的血流相对较高。黏膜对氧气的吸收通常受灌注限制。被吸收的氧气中有相当一部分直接被黏膜利用，而不是被血流摄取。
