Non-invasive ventilator breathing support through an external surface like a mask or nasal prongs; doesn't have to be worn all day; uses positive pressure airway Invasive ventilator breathing support through a nasal or oral ET tube or a tracheostomy; delivers air on a timed cycle and insures the patient takes a minimum number of breaths per minute Assist-control (AC) mode preset rate and tidal volumes; client initiates breath and vent takes over; risk of hyperventilation; sedation may b...