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Tidal volume
The volume of air received by the patient from the device (V
the patient (V
TE
V
V
TI
Figure 4.17: Tidal volume (V
Backup tidal volume
This is the minimum tidal volume delivered in each cycle.
However, this volume cannot be delivered in the following situations:
•
if the set threshold for the Pmax alarm is reached (the set Pmax value must be greater than
PS + PEEP + 5 hPa + 20%(PS + PEEP));
•
if the required pressure is greater than PS (or P insp) + PEEP + 5 hPa + 20% × (PS(or P insp)
+ PEEP);
•
if the required pressure is greater than 60hPa.
When the pressure is not sufficient to obtain an insufflated volume greater than or equal to the
backup tidal volume (V
backup tidal volume is delivered.
Note: 1hPa = 1mbar = 1.016cmH
NOT013189-6
V
(mL)
T
).
V
TE
).
T
V
(mL)
TS
), in the following cycle the pressure support is increased to ensure the
TS
O.
2
), and the volume of air exhaled by
TI
t
Ventilation
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