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198 4年Ｅｖａｎｓ[1] 等首先提出应用食管下段收缩性 (Ｌｏｗ ｅｒｅｓｏｐｈａｇｅａｌｃｏｎｔｒａｃｔｉｌｉｔｙ ,ＬＥＣ)作为麻醉深度的监测指标。其后的研究表明ＬＥＣ与麻醉深度相关 ,可作为麻醉深度判断的指标[2 ] 。迄今为止 ,有关研究多为吸入麻醉药与ＬＥＣ的关系
198 4 years Evans [1] first proposed the application of lower esophageal contractility (Low eresophagealcontractility, LEC) as a monitoring indicator of depth of anesthesia. Subsequent studies have shown that LEC and depth of anesthesia can be used as an indicator of depth of anesthesia [2]. So far, most of the studies concerned the relationship between inhaled anesthetics and LEC