Infants often have gagging and may have vomiting when a gastric tube, such as the NAVA catheter, is removed or replaced. Rarely, patients could have a gastric tube go into a place besides the stomach or coil in the esophagus. Researchers should be able to detect if this occurs using the placement screen on the ventilator because the NAVA catheter has electrodes on it that detect the electrical activity of the heart and diaphragm, which can be used to determine the location.