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首页> 外文期刊>The American journal of otology >Middle ear pressure variations during 50% N2O anesthesia as a function of mastoid pneumatization.
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Middle ear pressure variations during 50% N2O anesthesia as a function of mastoid pneumatization.

机译：50％N2O麻醉期间中耳压的变化与乳突气化有关。

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HYPOTHESIS: Mastoid size is a factor in middle ear (ME) pressure regulation. BACKGROUND: In a study investigating ME pressure variations during nitrous oxide (N2O) anesthesia, particularly high values of ME pressure increase rate (PIR) were observed in four patients with sclerotic mastoids. The current study is aimed at systematically assessing this observation. METHODS: Middle ear pressure was measured periodically in 30 patients during 50% N2O anesthesia using tympanometry. For each patient, a curve representing ME pressure during anesthesia was plotted. From the curve steepness, the PIR was calculated. Extent of mastoid pneumatization was assessed planimetrically using mastoid x-rays. Ears then were divided by the median into two groups: ears with small mastoids and ears with large mastoids. The difference between the mean PIR of both ear groups was statistically analyzed. RESULTS: A significant difference between the PIR was found among the two groups. In ears with mastoids smaller than 9.475 cm2 (the median), the PIR was significantly higher than in ears with mastoids > 9.475 cm2. CONCLUSIONS: These findings support the concept that the mastoid has a ME pressure buffering capability: the larger its volume, the better its buffering capability. It is therefore suggested, that the mastoid plays a role in ME pressure regulation.
机译：假设：乳突大小是中耳（ME）压力调节的一个因素。背景：在一项研究氧化亚氮（N2O）麻醉期间ME压力变化的研究中，在四名硬化性乳突患者中观察到特别高的ME压力增加率（PIR）值。当前的研究旨在系统地评估这种观察。方法：在30％N2O麻醉期间，使用鼓膜仪定期测量30例患者的中耳压力。对于每位患者，绘制了代表麻醉期间ME压力的曲线。根据曲线的陡度，计算出PIR。使用乳突X射线以平面方式评估乳突气化的程度。然后将耳朵按中位数分为两组：乳突小的耳朵和乳突大的耳朵。对两个耳朵组的平均PIR之间的差异进行统计分析。结果：两组之间的PIR之间存在显着差异。在乳突小于9.475 cm2（中位数）的耳朵中，PIR显着高于乳突大于9.475 cm2的耳朵。结论：这些发现支持了乳突具有ME压力缓冲能力的概念：其体积越大，缓冲能力越好。因此建议乳突在ME压力调节中起作用。

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