Grøntved A, Krogh H J, Christensen P H, Jensen P O, Schousboe H H, Hentzer E
ENT Department, Svendborg Hospital, Denmark.
Acta Otolaryngol. 1989 Jul-Aug;108(1-2):101-6. doi: 10.3109/00016488909107399.
The aim of this investigation was to monitor fluctuations in middle ear pressure, to study tympanometric signs of Eustachian tube functioning and to assess the validity of the tympanometric readings. In 20 patients with a low initial middle ear pressure (-150 daPa or lower) and 5 normals, impedance tympanometry was performed every 3 min through 7 h. Median pressure for the patients was -150 daPa (range 100 to -400 daPa) and for the normals 0 daPa (range 50 to -50 daPa). A remarkable pressure increase was seen after changing the body position to the supine. The patients were arranged into three groups according to the lowest middle ear pressure registered. Median pressures for the groups were running at a rather constant level. However, the individual pressure fluctuations in many patients were so great that a single tympanometric reading has to be considered unreliable when selecting patients for insertion of ventilation tubes. Thirteen patients never equalized their negative middle ear pressure, indicating that their Eustachian tube did not open during the test period. In spite of this the pressure did not decrease to lower values, indicating that maintaining a relative constant middle ear pressure is independent of opening of the Eustachian tube.
本研究的目的是监测中耳压力的波动，研究咽鼓管功能的鼓室导抗图体征，并评估鼓室导抗图读数的有效性。对20例初始中耳压力较低（-150 daPa或更低）的患者和5例正常人，每隔3分钟进行一次鼓室声导抗测试，持续7小时。患者的中位压力为-150 daPa（范围为100至-400 daPa），正常人为0 daPa（范围为50至-50 daPa）。将体位改为仰卧位后，可见压力显著升高。根据记录到的最低中耳压力，将患者分为三组。各组的中位压力保持在相当稳定的水平。然而，许多患者的个体压力波动很大，因此在选择插入通气管的患者时，单次鼓室导抗图读数被认为是不可靠的。13例患者的中耳负压从未平衡，表明在测试期间他们的咽鼓管未开放。尽管如此，压力并未降至更低值，这表明维持相对恒定的中耳压力与咽鼓管开放无关。
