• Yukihide Koyama, Hiroyuki Oshika, Hiroko Nishioka, Naoko Kamoshida, Sousuke Tanaka, Gaku Inagawa, and Tomio Andoh.
• Department of Anesthesiology, Mizonokuchi Hospital, Teikyo University School of Medicine, 5-1-1 Futako, Takatsu-ku, Kawasaki, Kanagawa, 213-8507, Japan. yukihidekoyama1008@gmail.com.
• BMC Anesthesiol. 2018 Jul 28; 18 (1): 99.

BackgroundThe increase in endotracheal tube cuff pressure due to nitrous oxide diffusion is a well-known risk during general anesthesia using nitrous oxide. We hypothesized that lubricating endotracheal tube cuffs with K-Y™ Jelly might inhibit the increase in cuff pressure that occurs during exposure to nitrous oxide.MethodsWe used two types of endotracheal tube cuffs: one made from ultrathin polyurethane (PU) and another made from conventional polyvinyl chloride (PVC). Using a pediatric trachea model, which consisted of an acrylic cylinder with an internal diameter of 12 mm, we measured changes in the cuff pressure during nitrous oxide exposure in size 5.0-mm internal diameter endotracheal tubes with each type of cuff, with and without lubrication with K-Y™ Jelly.ResultsDuring nitrous oxide exposure, the increase in cuff pressure was significantly lower in the lubricated cuffs than in the non-lubricated cuffs in both types of cuffs (PVC, P < 0.0001; PU, P < 0.0001). However, the cuff compliance in the trachea model was unaffected by lubrication in both types of cuffs.ConclusionsLubrication of endotracheal tube cuffs with K-Y™ Jelly may effectively delay the increase in cuff pressure that occurs during general anesthesia using nitrous oxide.

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