It has been proven that tracheal tube inflated with lidocaine could decrease the post-intubation sore throat in nitrous oxide anesthesia. In the study, the investigators would like to evaluate the effect of lidocaine inflation in non-nitrous oxide anesthesia and compare the effect of tetracaine, the best mucosal local anesthetics with lidocaine.
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Visual Analogue Scale(0-100mm) by the Subject.
Timeframe: 6 hours, 12 hours, 24 hours, 48 hours after extubation