Conclusion
Decreased neck extension assessed at the bedside is a predictor of unanticipated difficult intubation. Neck extensions of < 5 cm, in conjunction with the Mallampati airway classification, should become a routine part of airway assessment.
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References
Bellhouse CP, Dore C. Anesth Intens Care, 1988; 16: 329–37.
Mallampati SR, Gugino Laverne. Can Anaesth Soc J. 1985/32: 4/pp. 429–34.
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Wang, L., Hong, M., Milne, B. et al. Morphine decreasesin vivo catechol activity in the rostral ventrolateral medulla. Can J Anaesth 40, A4 (1993). https://doi.org/10.1007/BF03009529
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DOI: https://doi.org/10.1007/BF03009529