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Chapter 3 Modes, Features, and Alarms
29
During the time window, if patient eort is detected, either a
Spontaneous or an Assist breath is delivered for the rst eort. If the
last breath delivered was Mandatory, then a Spontaneous breath is
delivered for the rst patient eort of the window. If the last breath
delivered was an Assist or Spontaneous breath, then an Assist breath
is delivered for the rst patient eort of the window. Assist breaths
deliver the prescribed Tidal Volume during inhalation and the PEEP
setting during exhalation.
During the time window, if patient eort continues to be detected
(after the rst patient triggered breath), Spontaneous breaths are
delivered for the remainder of the window. Spontaneous breaths
deliver the prescribed Pressure Support setting above PEEP during
inhalation and PEEP during exhalation. The gure below provides
example breath patterns in SIMV mode.
12 seconds12 seconds12 seconds12 seconds
2
3
3
111
Tidal Volume = 500 mL
Breath Rate = 5 BPM
Inspiratory Time = 3.0 seconds
Pressure Support = 10 cm H
2
O
PEEP= 6 cm H
2
O
= Pressure Supported
Breath
= Mandatory Breath
= Assist Breath
= Mandatory Window
= Spontaneous Window
1
2
5 10 15 20 25 30 35 40 45
6
10
20
26
Enter SIMV mode
M
M MM M
S
S S
PRESSURE
TIME
2
SIMV Mode