Tracheal intubation of morbidly obese patients: a randomized trial comparing performance of Macintosh and Airtraq™ laryngoscopes S.K. Ndoko, R. Amathieu,

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Tracheal intubation of morbidly obese patients: a randomized trial comparing performance of Macintosh and Airtraq™ laryngoscopes S.K. Ndoko, R. Amathieu, L. Tual, C. Polliand, W. Kamoun, L. El Housseini, G. Champault, G. Dhonneur British Journal of Anaesthesia Volume 100, Issue 2, Pages 263-268 (February 2008) DOI: 10.1093/bja/aem346 Copyright © 2008 British Journal of Anaesthesia Terms and Conditions

Fig 1 Horizontal (a) and vertical (b) views of the Airtraq™ laryngoscope. The square shaped proximal end of the laryngoscope contains the proximal lens, the batteries, and the video port. The distal part consists of the blade, the light source, and another lens, smaller than the proximal one. The light source heats the distal lens to prevent fogging. On the right side of the Airtraq™ body, there is a side channel which guides the endotracheal tube and from which it can be withdrawn sideways. The proximal lens (b) and the switch for the light are covered by a latex top (a, b). This latex top can be removed to fit a camera onto the proximal part of the Airtraq™. British Journal of Anaesthesia 2008 100, 263-268DOI: (10.1093/bja/aem346) Copyright © 2008 British Journal of Anaesthesia Terms and Conditions

Fig 2 Intubating with the Airtraq™ laryngoscope. The head is placed in the neutral position. The standard technique (a) consists of sliding the tip of the Airtraq™ laryngoscope into the mouth along the tongue. The blade of the laryngoscope is kept in contact with the tongue (a-i) until the epiglottis comes into view (A-ii). If passage of the laryngoscope into the oropharynx is difficult (a-iii), crawling movements are used to move the blade over the tongue towards the epiglottis (a-iv). Once the tip of the laryngoscope is positioned in the valecula, the laryngoscope is lifted straight up to expose the glottis (upper arrow, a-ii). For rotational insertion (b), the Airtraq™ laryngoscope is inserted into the mouth from 90° to 180° (b-i) to the usual direction and then rotated into the usual position (b-ii). British Journal of Anaesthesia 2008 100, 263-268DOI: (10.1093/bja/aem346) Copyright © 2008 British Journal of Anaesthesia Terms and Conditions

Fig 3 Photograph of an operator intubating a manikin with the Airtraq™. The operator slides the endotracheal tube along the channel along the Airtraq™. The tube is then removed from the Airtraq from the side opening channel. British Journal of Anaesthesia 2008 100, 263-268DOI: (10.1093/bja/aem346) Copyright © 2008 British Journal of Anaesthesia Terms and Conditions