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P
V
V
Figure 4.27: PS.VT curve - Minimum tidal volume delivered with switch to volumetric mode.
Based on its analysis of the fixed pressure support and Ti Max parameters, the device detects,
during the course of the cycle, that the target minimum tidal volume V
device then activates volumetric mode during the cycle. A constant ventilatory flow is calculated
and delivered until Ti Max is reached.
The so-called "volumetric" or "controlled flow" phase occurs between vertical lines 1 and 2.
Circle A shows the peak in pressure, which is higher than the set pressure. Circle B shows the
phase during which the device maintains a constant flow, until the end of the Ti.
Caution
!
In certain situations, the minimum V
•
when the delivered pressure reaches the Pmax value;
•
when certain parameter settings are reached (low Ti, low PS and high V
60/170
1
2
Timax
I
E
I
A
t
t
B
t
E
cannot be delivered:
T
cannot be delivered. The
T
).
T
NOT013189-6
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