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Esophageal Tracheal Combitube, Endotracheal Airway, and Mask

1989; Lippincott Williams & Wilkins; Volume: 29; Issue: 11 Linguagem: Inglês

10.1097/00005373-198911000-00004

1529-8809

Michael Frass, Suzanne Rödler, Reinhard Frenzer, WILFRIED ILIAS, Christian Leithner, Franz Lackner,

Foreign Body Medical Cases

The esophageal tracheal Combitube (ETC) is a new airway especially designed for airway maintenance and ventilation in unconscious patients such as those requiring CPR. The ETC may be used as an esophageal obturator or an endotracheal airway. Previous studies yielded a significantly higher mean arterial oxygen tension (PaO2) during ventilation using an ETC in the esophageal position compared to a conventional endotracheal airway (ETA). To investigate this phenomenon, endotracheal and airway opening pressures were examined in 12 patients in randomized order during ventilation with an ETC in the esophageal position, with an ETA, and with a mask, respectively. In this study again the Pa02 was higher with ETC compared to ETA. The following differences in intratracheal pressure and flow could be found for ETC when compared to ETA: smaller rising pressure during inspiration, prolonged expiratory flow time, and formation of a small positive end expiratory pressure (PEEP). These factors may be responsible for the improved oxygen tension with ETC. Comparing mask to ETC ventilation, PaO2 did not differ; however, mean arterial carbon dioxide tension was higher during mask ventilation. From the II Department of Internal Medicine and the Department of Anaesthesia and General Intensive Care, University of Vienna, Austria.