Journal
ANAESTHESIA
Volume 67, Issue 6, Pages 626-631Publisher
WILEY
DOI: 10.1111/j.1365-2044.2012.07087.x
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Funding
- Society for Airway Management
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Laryngoscopy can induce stress responses that may be harmful in susceptible patients. We directly measured the force applied to the base of the tongue as a surrogate for the stress response. Force measurements were obtained using three FlexiForce Sensors (R) (Tekscan Inc, Boston, MA, USA) attached along the concave surface of each laryngoscope blade. Twenty-four 24 adult patients of ASA physical status 12 were studied. After induction of anaesthesia and neuromuscular blockade, laryngoscopy and tracheal intubation was performed using either a Macintosh or a GlideScope (R)(Verathon, Bothell, WA, USA) laryngoscope. Complete data were available for 23 patients. Compared with the Macintosh, we observed lower median (IQR [range]) peak force (9 (513 [325]) N vs 20 (1428 [441]) N; p = 0.0001), average force (5 (37 [219]) N vs 11 (616 [124]) N; p = 0.0003) and impulse force (98 (42151 [26444]) Ns vs 150 (93207 [17509]) Ns; p = 0.017) with the GlideScope. Our study shows that the peak lifting force on the base of the tongue during laryngoscopy is less with the GlideScope videolaryngoscope compared with the Macintosh laryngoscope.
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