CPAP/BPAP Machine

A similar therapy is called bilevel, or BiPAP, but it differs in important ways. BiPAP is an abbreviation trademarked by the manufacturer Respironics for bilevel positive airway pressure. (It is called VPAP by the other major manufacturer, ResMed.) The “bilevel” component refers to the fact that there are in fact two pressures, which the machine is able to alternate between.