Gastric drainage tubes are larger and more rigid. This may be more irritating to the nasal mucosa than smaller bore and flexible feeding tubes. Nasal placement of gastric DRAINAGE tubes may increase the risk for sinusitus.
Because one of the risk factors for VAP is the colonization of nasopharyngeal bacteria, sinusitus increases the risk for pneumonia.
Oral gastric tubes may cause gagging and be poorly tolerated if the patient does not have an oral endotracheal tube, therefore, nasal gastric placement may be necessary in non-intubated patients.