Many people feel nauseated and may vomit after waking up from anesthesia.
Mechanical ventilation through an endotracheal tube intubation A plastic tube is inserted through the nose or mouth into the windpipe and air or an air—oxygen mix is blown in and out of the lungs under pressure.
By pushing you have much more fine control and strength.
Each of these devices have its own unique set of benefits and drawbacks, and none of them is effective under all circumstances.
Mayo Foundation for Medical Education and Research.
To check minimal seal, suction the airway free of secretions.