8We therefore hypothesized that the short-term use of an ETT impairs the receptors at the vocal cords and diminishes the laryngeal reflexes, whereas the use of an LMA™ preserves the laryngeal reflexes. In fact, our previous study demonstrated that LMA™ placement was capable of preserving postoperative laryngeal patency more than ETT placement. In contrast, because the Laryngeal Mask Airway™ (LMA™) (LMA-Classic™ Laryngeal Mask Company, Nicosia, Cyprus) does not directly touch the vocal cords, it is believed to be less traumatic on the reflexogenic area of the larynx and to preserve laryngeal reflexes. 7Consequently, sensory impairment of the larynx where the ETT directly touches the vocal cords was suggested to occur during placement of an ETT and to modify laryngeal reflexes.
Our previous study, we found that in surgical patients anesthetized with sevoflurane, postoperative airway reflex responses differed from those occurred before surgery in patients with ETT placement.
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