C-28 624074/07
CASV
®
(Adaptive Support Ventilation)
Next, Otis’ equation is applied with the following parameters:
MinVol = 7 l/min
VDaw = 154 ml
RCexp = 0.5s
a = 2
π
2
/60
f = 10 b/min (this is always used as a starting value)
The result is a new rate f(1)
f(1) = 15 b/min
This rate is again inserted into Otis’ equation, the calculation
is performed again, and the next estimate for rate f(2) is
obtained. This procedure is repeated until the difference bet-
ween subsequent results for rate (f) becomes lower than 0.5 b/
min. In the present example, one iteration step is sufficient,
i.e.,
ftarget = 15 b/min
Finally, the target tidal volume is obtained by dividing MinVol
by f:
Vtarget = 7000 ml/min / 15 b/min = 467 ml
C.5 ASV technical data
Table C-5 lists technical data related to ASV. Underlined param-
eters are operator-set in the ASV mode.
Table C-5. ASV technical data
ASV-related operator settings
%MinVol 25 to 350%
Patient height 130 to 250 cm / 50 to 100 in.
(adult)
30 to 150 cm / 12 to 60 in.
(pediatric)
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