<unk> , assisted ventilation or intermittent mandatory ventilation (IMV), is the medical term for using a machine called a ventilator to fully or partially provide artificial ventilation.<unk>  helps move air into and out of the lungs, with the main goal of helping the delivery of oxygen and removal of carbon dioxide.<unk>  is used for many reasons, including to protect the airway due to<unk>  or neurologic cause, to ensure adequate oxygenation, or to remove excess carbon dioxide from the lungs. Various healthcare providers are involved with the use of<unk>  and people who require ventilators are typically monitored in an intensive care unit.<unk>  is termed invasive if it involves an instrument to create an airway that is placed inside the trachea. This can be achieved with many instruments, most commonly through an endotracheal tube. Face or nasal masks are used for non-invasive ventilation in appropriately selected people who are conscious. The two main types of<unk>  include positive pressure ventilation where air is pushed into the lungs through the airways, and negative pressure ventilation where air is pulled into the lungs. There are many specific modes of<unk> , and their nomenclature has been revised over the decades as the technology has continually developed.
Mechanical ventilation
Negative pressure ventilator
Artificial ventilation
Positive airway pressure
Non-invasive ventilation
High-frequency ventilation
Pressure support ventilation
Surfactant therapy