A number of terms have been used in the medical literature to describe<unk> . The more formal name "non-invasive positive pressure ventilation" (NPPV or NIPPV) has been used to distinguish it from the use of the now very rare negative pressure ventilator ("iron lung"). The brand name BiPAP/BIPAP (for Bilevel Positive Airway Pressure) has also enjoyed a degree of popularity, after an early<unk>  machine produced by Respironics, but its use is now discouraged.
Non-invasive ventilation
Negative pressure ventilator
Mechanical ventilation
Artificial ventilation
Positive airway pressure
High-frequency ventilation
Bubble CPAP
Pressure support ventilation