Gaihede M, Kjaer D
Department of Otolaryngology, Holstebro Central Hospital, Denmark.
Auris Nasus Larynx. 1998 Sep;25(3):255-9. doi: 10.1016/s0385-8146(98)00009-1.
Middle ear pressure has been shown to increase when body position is shifted from the erect to the supine position, which is explained by an increased volume of the middle ear mucosa due to an increased hydrostatic pressure. The increase in the volume of middle ear mucosa consists of a fast major response followed by slow minor increase, which is reflected by a similar pattern in the increase of middle ear pressure. Since many otological experiments may be performed with subjects in the supine position, it is of interest to analyse these changes in middle ear pressure, as results may be affected by changes in middle ear pressure. The present study investigated the middle ear pressure changes due to a shift in body position from sitting to supine at time intervals of 15 s over a period of 120 s in a group of 20 normal adults. The middle ear pressure was found to increase 22 daPa (mean; S.D. = 12.1), whereas a stable middle ear pressure was reached after 30 s, indicating a steady state concerning the increase in volume of the middle ear mucosa. Thus, it is recommended that experiments with subjects in the supine position should be carried out only after assuming the position for 30 s. The increase in pressure did not correlate to the prevailing middle ear pressure or to the body height.
当身体姿势从直立位转变为仰卧位时，中耳压力会升高，这是由于静水压力增加导致中耳黏膜体积增大所致。中耳黏膜体积的增加包括快速的主要反应，随后是缓慢的微小增加，这在中耳压力的增加中也有类似表现。由于许多耳科实验可能在受试者仰卧位时进行，分析中耳压力的这些变化很有意义，因为结果可能会受到中耳压力变化的影响。本研究在一组20名正常成年人中，以15秒的时间间隔，观察了120秒内身体姿势从坐位转变为仰卧位时的中耳压力变化。发现中耳压力增加了22达帕（平均值；标准差=12.1），而在30秒后达到稳定的中耳压力，这表明中耳黏膜体积增加达到了稳定状态。因此，建议在受试者处于仰卧位30秒后再进行相关实验。压力的增加与当时的中耳压力或身高无关。
