| Esophageal detectors rely on the fact that the trachea is rigid and the esophagus is flexible. The esophagus collapses under negative pressure and the trachea does not. If you apply suction with either a bulb syringe or rigid syringe, it will draw back easily if the ET tube is in the trachea and will not draw back if the tube is in the esophagus. False positives may occur if a large amount has been introduced into the stomach and esophagus; for example with aggressive bag-mask-ventilations. |
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