A 55-year-old woman was scheduled for left thyroidectomy. Anesthesia was induced without problems and maintained without nitrous oxide. Sixteen minutes after the start of the procedure, airway pressures and endtidal carbon dioxide concentration increased suddenly. An attempt to pass a suction catheter down the endotracheal tube was unsuccessful. A protuberance was found in the reinforced endotracheal tube. After reintubation with a new reinforced endotracheal tube, ventilation was improved immediately. The rest of the procedure was done uneventfully. Similar phenomenon was reported in the reuse of endotracheal tube and the use of nitrous oxide. In our case, airway obstruction was caused by the pinhole that was created in a manufacturing process. We have to keep in mind that endotracheal tube itself may be out of order if other causes have been excluded.
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