Table 3.

Controllable parameters.

Parameter name	Input	Description
Run enable	On/off	Controls the basic state of the ASVa
Control mode	Pressure/volume	Determines whether the ASV is limited by pressure or tidal volume
Respiration rate	Breaths per minute, in increments of 1 breath per minute	This parameter sets the minimal cycle rate for inhalation. Inhalations can occur more frequently by voluntary inhalation when pressure goes below the trigger threshold parameter. It is set from the GUIb or control panel.
Inspiratory time	In seconds, in increments of 0.1 seconds	This parameter sets the time for the self-inflating bag compression and hold. It is set from the GUI or control panel.
PIPc (maximum pressure)	In centimeters of water	This parameter is set by manually adjusting the PIP valve and by setting the maximum pressure parameter in the GUI or control panel. The PIP setting in the software provides an independent alarm if the PIP valve malfunctions.
PEEPd	In centimeters of water	This parameter is set by manually adjusting the PEEP Valve in the patient circuit.
PEEP, minimum	In centimeters of water	This parameter sets a warning threshold if the patient pressure goes below this value.
Trigger threshold	In centimeters of water	If the patient pressure goes below this threshold, an inspiration cycle is initiated. This threshold is compared against an absolute pressure gauge measurement, and is not relative to PEEP.
Maximum volume	In milliliters	This parameter sets the tidal volume limit by stopping the compression of the bag. An adaptive algorithm adjusts the internal microprocessor set-point based on the flow measurement to achieve reasonably precise volume control. This limit is always active, and does not require a different mode of ASV operation.

^aASV: acute-shortage ventilator.

^bGUI: graphical user interface.

^cPIP: peak inspiratory pressure.

^dPEEP: positive end-expiratory pressure.