C-24 624074/07
CASV
®
(Adaptive Support Ventilation)
C.3.5 Dynamic adjustment of lung protection
The operator preset values are not changed by ASV, and the
corresponding safety limits remain as defined above. However,
if the respiratory system mechanics change, the safety limits
change accordingly and as defined in Section C.3.3. The safety
limits are updated on a breath-by-breath basis.
For example, if the lungs stiffen, the high Vt limit is lowered
proportionally, and the high Rate limit is increased according to
Equation 5.
This dynamic adjustment ensures that ASV applies a safe
breathing pattern at all times. In graphical terms, the dotted
rectangle changes as shown in Figure C-11.
Figure C-11. Lung-protective limits are changed dynami-
cally and according to the respiratory system mechanics.
However, the limits derived from the operator input are never
violated.
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