624074/07 C-23
Figure C-10. Example of a situation after the three initial
breaths. The patient symbol marks the actual measured values
for Vt and rate.
To achieve the target, use this strategy:
• If actual Vt < target Vt, the inspiratory pressure is increased.
• If actual Vt > target Vt, the inspiratory pressure is
decreased.
• If actual Vt = target Vt, the inspiratory pressure is left
unchanged.
• If actual rate < target rate, the SIMV rate is increased.
• If actual rate > target rate, the SIMV rate is decreased.
• If actual rate = target rate, the SIMV rate is left unchanged.
As a result, the patient symbol in Figure C-10 moves toward
the circle. The actual Vt is calculated as the average of inspira-
tory and expiratory volumes of the last 5 breaths. This defini-
tion compensates in parts for leaks in the breathing circuit,
including the endotracheal tube.
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