Use only under medical supervision. Incorrect placement can cause serious harm (aspiration, pneumothorax); always confirm placement before use. Use caution in patients with facial/nasal trauma, base of skull fracture, esophageal strictures/varices, recent upper GI surgery, severe coagulopathy. Monitor for aspiration, respiratory distress, bleeding, tube blockage, and pressure injury to nares. Maintain hygiene to reduce infection risk; do not reuse if device is intended for single use.