routine use of nasogastric tubes in major surgery is associated with unwarranted risks of aspiration through at least three mechanisms : hypersalivation -- allowing pooling of secretions in the hypopharynx , a depressed cough reflex , which is often associated with nasogastric intubation , and various laryngeal and pharyngeal abnormalities that are frequently caused by nasogastric tubes , leading to an inability to handle secretions and protect the airway .
C0020629
hypopharynx
C0031354
pharyngeal