Lee L, Weightman W M
Department of Anaesthesia, Sir Charles Gairdner Hospital, Perth, Australia.
Anaesthesia. 2008 Apr;63(4):375-8. doi: 10.1111/j.1365-2044.2008.05492.x.
Laryngoscopy is sometimes easier with the patient's head and neck in the extension-extension position (head extension with the neck extended by the head section of the table bent down at 30 degrees) rather than the classical 'sniffing the morning air' position. We therefore tested the hypothesis that the axial force required for laryngoscopy is less in the extension-extension than the sniffing position. We measured the force axial to the handle of a Macintosh 3 laryngoscope in 20 subjects under general anaesthesia who had been given neuromuscular blocking drugs. Measurement of force was made in the sniffing position and the extension-extension position. The mean (SD) axial force required in the extension-extension position was lower than in the sniffing position (19.6 (7.8) N versus 23.6 (8.6) N, p = 0.04). In the setting of routine tracheal intubation, less force is required when the patient is in the extension-extension position than in the sniffing position.
对于患者而言，有时将头颈部置于伸展-伸展位（头部伸展，颈部由手术台头部部分向下弯曲30度而伸展）进行喉镜检查比传统的“闻清晨空气”位更容易。因此，我们检验了这样一个假设：与“闻清晨空气”位相比，喉镜检查在伸展-伸展位所需的轴向力更小。我们在20名接受全身麻醉且已使用神经肌肉阻滞剂的受试者中，测量了麦金托什3号喉镜手柄轴向的力。分别在“闻清晨空气”位和伸展-伸展位测量力。伸展-伸展位所需的平均（标准差）轴向力低于“闻清晨空气”位（19.6（7.8）牛顿对23.6（8.6）牛顿，p = 0.04）。在常规气管插管的情况下，患者处于伸展-伸展位时所需的力比处于“闻清晨空气”位时更小。
