Sørensen V Z, Bonding P
Department of Otolaryngology, Glostrup Hospital, Copenhagen, Denmark.
J Laryngol Otol. 1995 Nov;109(11):1036-40. doi: 10.1017/s0022215100131974.
Rupture of the tympanic membrane (TM) during ear irrigation is a rare but unhappy event. In this study the maximum overpressures obtained in the deep part of the external auditory meatus (EAM) during ear irrigation were measured postmortem in 20 cadavers. The highest pressures were obtained in normal- or wide-dimension EAMs when a metal syringe was used. With this device, the median maximum overpressure was 240 mmHg (range 200-300 mmHg). Experiments with simulation of an obturating wax plug did not increase the maximum overpressure. Compared with the lowest overpressures which can rupture TMs the pressures measured in this study were insufficient to rupture normal TMs but sufficient to rupture atrophic TMs with the lowest tensile strength. This finding may have medicolegal implications.
耳部冲洗过程中鼓膜破裂是一种罕见但令人不快的事件。在本研究中，对20具尸体进行了死后测量，以确定耳部冲洗期间在外耳道深部获得的最大超压。使用金属注射器时，在正常尺寸或较宽尺寸的外耳道中获得的压力最高。使用该装置时，最大超压中位数为240 mmHg（范围为200 - 300 mmHg）。模拟封闭性蜡塞的实验并未增加最大超压。与能够使鼓膜破裂的最低超压相比，本研究中测量的压力不足以使正常鼓膜破裂，但足以使抗拉强度最低的萎缩性鼓膜破裂。这一发现可能具有法医学意义。
