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[[File:Bi SoftPAP.png|thumb|center|1000px]]

*'''BiSoft modes''' apply a gradual ramp upto a pressure level known as '''EEPAP''' (end expiratory positive airway pressure). This end of expiration pressure is applied at the most critical time for airway collapse and provides important airway stenting, in preparation for inspiration. It can limit central apnea, round out exhalation and permit generally lower pressures.