(See also How To Do Noninvasive Positive Pressure Ventilation.) Noninvasive Positive Pressure Ventilation (NIPPV) Using Bilevel Positive Airway Pressure VIDEO NIPPV can be given as Continuous positive airway pressure (CPAP) Bilevel positive airway pressure (BiPAP) In CPAP, constant pressure is maintained throughout the respiratory cycle with no additional inspiratory support.