Butler P J, Dhara S S
Department of Anaesthesia, Singapore General Hospital.
Anaesth Intensive Care. 1992 May;20(2):139-42. doi: 10.1177/0310057X9202000202.
Two hundred and fifty patients were assessed preoperatively using the Mallampati classification and by measuring their thyromental distances. The ease or difficulty of direct laryngoscopy was assessed at the time of induction of anaesthesia. Retrognathia was seen in 15.6% of patients and the incidence of difficult laryngoscopy without external laryngeal pressure was 8.2%. It was found that both assessments predicted less than two in three difficult laryngoscopies and had high false positive rates. It was found that external laryngeal pressure often improved the view of the glottis in difficult laryngoscopies.
术前对250例患者使用Mallampati分级并测量其甲颏距离进行评估。在麻醉诱导时评估直接喉镜检查的难易程度。15.6%的患者存在下颌后缩，无外部喉压迫时困难喉镜检查的发生率为8.2%。结果发现，两种评估方法预测的困难喉镜检查发生率均不到三分之二，且假阳性率高。结果发现，在困难喉镜检查中，外部喉压迫常常能改善声门的视野。
