Ball A J, Craig J, Green R J, Richardson D J
Anaesthetic Department, West Dorset General Hospital, Dorset, United Kingdom.
Anaesth Intensive Care. 2007 Apr;35(2):226-9. doi: 10.1177/0310057X0703500212.
When considering anaesthetic masks, the quality of the mask-face seal is a key determinant of performance. This randomised crossover trial utilises expired oxygen concentration to compare the efficacy of two routinely used facemasks. Thirty subjects were randomised to breathe 100% oxygen via either a traditional reusable black rubber mask or the disposable Intersurgical Scented mask for three minutes. This was then repeated using the other mask. To compare the impact of mask design on the quality of the mask-face seal, it was necessary to minimise measures taken by the anaesthetist to correct for a poor seal. To achieve this, the anaesthetist was requested to hold the mask in a manner consistent with an airtight seal, but they were blinded to capnography and reservoir bag movement. Expired oxygen concentration was recorded at 15-second intervals. From the oxygen wash-in curves, the Intersurgical mask consistently outperformed the black rubber mask. At three minutes the Intersurgical mask performed better than the black rubber mask, with mean end-tidal oxygen concentrations of 86.9% vs. 81% respectively; P=0.008. These findings indicate that the soft cuff design of the intersurgical mask provided a better seal than the black rubber facemask.
在考虑麻醉面罩时，面罩与面部的密封质量是性能的关键决定因素。这项随机交叉试验利用呼出氧气浓度来比较两种常用面罩的效果。30名受试者被随机分配，通过传统的可重复使用黑色橡胶面罩或一次性的英特外科有香味面罩呼吸100%氧气三分钟。然后使用另一种面罩重复该过程。为了比较面罩设计对面罩与面部密封质量的影响，有必要尽量减少麻醉师为纠正密封不良而采取的措施。为了实现这一点，要求麻醉师以与气密密封一致的方式握持面罩，但他们对二氧化碳图和贮气囊运动不知情。每隔15秒记录一次呼出氧气浓度。从氧气吸入曲线来看，英特外科面罩始终优于黑色橡胶面罩。三分钟时，英特外科面罩的表现优于黑色橡胶面罩，平均呼气末氧气浓度分别为86.9%和81%；P = 0.008。这些发现表明，英特外科面罩的软袖口设计比黑色橡胶面罩提供了更好的密封。
