Cormack–Lehane classification revisited

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Cormack–Lehane classification revisited R Krage, C van Rijn, D van Groeningen, S.A. Loer, L.A. Schwarte, P Schober British Journal of Anaesthesia Volume 105, Issue 2, Pages 220-227 (August 2010) DOI: 10.1093/bja/aeq136 Copyright © 2010 The Author(s) Terms and Conditions

Fig 1 CL grades 1 (a), 2 (b), 3 (c), and 4 (d) in the SimManTM human patient simulator. a, laryngoscope blade; b, epiglottis; c, glottic opening; d, arytenoid cartilages. According to the original definition by Cormack and Lehane, most of the glottic opening can be seen with grade 1. In grade 2, only the posterior portion of the glottis or only arytenoid cartilages are visible. In grade 3, only the epiglottis but no portion of the glottis is visible, whereas in grade 4, neither the glottis nor the epiglottis can be seen. British Journal of Anaesthesia 2010 105, 220-227DOI: (10.1093/bja/aeq136) Copyright © 2010 The Author(s) Terms and Conditions

Fig 2 SimManTM full-scale patient simulator positioning during laryngoscopies. British Journal of Anaesthesia 2010 105, 220-227DOI: (10.1093/bja/aeq136) Copyright © 2010 The Author(s) Terms and Conditions

Fig 3 Percentage of survey participants (n=117) who defined CL grades 1, 2, 3, and 4 and all four grades correctly (blue portion of the bars) or incorrectly (green-striped portion of the bars). British Journal of Anaesthesia 2010 105, 220-227DOI: (10.1093/bja/aeq136) Copyright © 2010 The Author(s) Terms and Conditions

Fig 4 Agreement between preset CL grade and the grade observed by participants (n=20). The blue portion of the columns represents the percentage of participants who showed agreement with the preset grade, whereas the green-striped portion represents the percentage of participants who showed no agreement. *P<0.05 vs CL 1, CL 2, and CL 4. British Journal of Anaesthesia 2010 105, 220-227DOI: (10.1093/bja/aeq136) Copyright © 2010 The Author(s) Terms and Conditions

Fig 5 Agreement of participants (n=20) between their first (dot) and second (box) evaluation of preset CL grade 2. Ten of the 20 participants agreed in their first and second assessment, six participants assigned a lower grade (↓), and four participants a higher grade (↑) at the second evaluation. British Journal of Anaesthesia 2010 105, 220-227DOI: (10.1093/bja/aeq136) Copyright © 2010 The Author(s) Terms and Conditions