PHILIPS Respironics Trilogy 202 User Manual page 38

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