Felding J U, Gaihede M, Elbrønd E
Department of Otolaryngology, Aarhus University Hospital, Denmark.
Acta Otolaryngol. 1995 May;115(3):408-13. doi: 10.3109/00016489509139339.
A frequent finding in patients with earlier otitis media is the sequelae of tympanic membrane atrophy and sclerosis. A major number of these patients nevertheless present with normal audiometric and tympanometric findings. In search of an objective and quantitative description of these pathological changes a new instrument has been developed to measure pressure changes in the ear canal as a function of dynamic tympanic membrane volume displacement. This pressure-volume relationship of the middle ear system expresses non-linear behaviour and hysteresis, which is due to loss of energy under dynamic conditions. Hysteresis can be measured and is here introduced as a new mechanical variable of the middle ear system along with dynamic compliance. Hysteresis is expressed in microJ and compliance in microliter/cmH2O. Analytical measurements of the instrument were found to be small compared with clinical values (< 2.8%). This paper will be succeeded by another study presenting the clinical application of the method and a normal material.
早期中耳炎患者中常见的发现是鼓膜萎缩和硬化的后遗症。然而，这些患者中的大多数听力测定和鼓室图检查结果正常。为了寻找对这些病理变化进行客观和定量描述的方法，已开发出一种新仪器，用于测量外耳道压力变化与鼓膜动态容积位移的函数关系。中耳系统的这种压力-容积关系表现出非线性行为和滞后现象，这是由于动态条件下的能量损失所致。滞后现象可以测量，并且在此作为中耳系统的一个新的力学变量与动态顺应性一起引入。滞后现象以微焦耳表示，顺应性以微升/厘米水柱表示。与临床值相比，该仪器的分析测量值较小（<2.8%）。本文之后将有另一项研究介绍该方法的临床应用和正常数据。
