Airway Pressure Release Ventilation (APRV) or BiVent: What the heck is this?

Airway pressure release ventilation (APRV) is not a new mode of mechanical ventilation, but it seems to be gaining a great deal of popularity lately.  Many people find this mode very complicated and thick that it is reserved only for the very ill.   Neither one of these assumptions are corrrect.  This mode is very easy to learn and use.  Furthermore, this mode is very physiological and tolerated by all types of patients.