Cormack-Lehane grading system
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The Cormack-Lehane grading system classifies airway views during direct laryngoscopy based upon the visible anatomical structures.
| Grade | Visible structures | Approximate frequency | Likelihood of difficult intubation |
|---|---|---|---|
| 1 | Full view of glottis | 68-74% | <1% |
| 2a | Partial view of glottis | 21-24% | 4.3-13.4% |
| 2b | Only posterior extremity of glottis and/or arytenoid cartilages | 3.3-6.5% | 65-67.4% |
| 3 | Only epiglottis | 1.2-1.6% | 80-87.5% |
| 4 | Neither glottis nor epiglottis | very rare | very likely |
References
- ↑ Yentis, S. M.; Lee, D. J. (1998). "Evaluation of an improved scoring system for the grading of direct laryngoscopy". Anaesthesia. 53 (11): 1041–1044. doi:10.1046/j.1365-2044.1998.00605.x. ISSN 0003-2409. PMID 10023271.
- ↑ Koh, L. K. D.; Kong, C. E.; Ip-Yam, P. C. (2002). "The modified Cormack-Lehane score for the grading of direct laryngoscopy: evaluation in the Asian population". Anaesthesia and Intensive Care. 30 (1): 48–51. doi:10.1177/0310057X0203000109. ISSN 0310-057X. PMID 11939440.
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