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  • Title: Evaluation of a technique of nitrogen insufflation to decrease plastic endotracheal tube cuff flammability during carbon dioxide laser surgery.
    Author: Sosis MB.
    Journal: J Clin Anesth; 1993; 5(6):468-70. PubMed ID: 8123272.
    Abstract:
    STUDY OBJECTIVE: To determine whether nitrogen insufflation reduces the laser-induced combustibility of polyvinyl chloride (PVC) endotracheal tube cuffs. SETTING: Research laboratory of a metropolitan, university-affiliated medical center. DESIGN AND INTERVENTIONS: A plastic catheter was fastened along the shafts of 10 PVC endotracheal tubes with self-adhesive copper foil tape down to a level just above the cuff. The modified endotracheal tubes were inserted into graduated cylinders and flushed with oxygen. The cuffs were then inflated with air, and a carbon dioxide (CO2) laser was aimed at them. Five of the modified endotracheal tubes had 10 L/min of nitrogen insufflated via the plastic tube. MEASUREMENTS AND MAIN RESULTS: The laser ignited only 1 of the cuffs insufflated with nitrogen; however, all 5 of the modified endotracheal tubes that were not insufflated burned (p < 0.05). CONCLUSION: Nitrogen insufflation decreases CO2 laser-induced PVC endotracheal tube cuff combustibility. However, clinical applications of this technique should be undertaken with caution, as the administration of a hypoxic mixture may be possible.
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