Control: ventilator delivers gas at selected tidal volume, peak flow and rate settings. The patient is still able to draw spontaneous breaths through the piston bypass check valve.
Assist Control: a positive pressure breath is triggered when the patient's spontaneous inspiratory effort drops below the pre-set assist sensitivity level; if the patient does not trigger the machine within the breath-to-breath time set by the rate control, the vent will automatically deliver a breath.
SIMV: (Synchronized Intermittent Mandatory Ventilation) allows the patient to breath spontaneously and to receive a fixed number of positive pressure breaths as set by the rate control. These breaths can be patient-initiated (assisted) or ventilator-initiated (controlled).CPAP: (Continuous Positive Airway Pressure) delivers a continuous inspiratory pressure.