U
SING
THE
ZOLL V
ENTILATOR
4-8
www.zoll.com
906-0731-01-05 Rev. C
Vt (Tidal Volume)
The Vt parameter gives the tidal volume (ml) delivered to the lung. The selected ventilation
mode determines if this value is a setting or a measurement.
In volume targeted modes, pressing the VT parameter button highlights the current set tidal
volume and enables it to be changed.
In pressure targeted breaths, the delivered tidal volume is shown as outlined text and is based
on the patient pulmonary mechanics. The VT High and Low Limits are also available as
secondary parameters.
Warning!
In NPPV, a VT that is lower than anticipated given the patient's size may be an
indication that the patient is not able to adequately spontaneously ventilate.
The ventilator circuit is part of the breathing system of the ventilator. Tubing compliance of the
circuit is a physical property that affects the tidal volume delivered to the patient. The ZOLL
Ventilator allows you to adjust the compliance value of the circuit (see Chapter 6 for more
information).
Note:
In the CPAP-NPPV, the V
T
delivered and V
min
may be overestimates of the true
volume going to the patient when leaks are present. The O
2
Use values accurately
display the O
2
use, though the amount used is more than if no leak was present.
Warning!
If significant leaks are present during NPPV modes, the V
T
delivered and V
min
shown
may be overestimates of what is actually being delivered to the patient. The adequacy of
ventilation should be assessed using an alternate method.
