PHILIPS Respironics Trilogy 202 User Manual page 37

28
Assist Control (AC) Mode
In Assist Control (AC) mode, the device delivers volume control
therapy. This mode provides Assist and Mandatory breaths. An Assist
breath is started when there is patient effort, but it is ended when
the Inspiratory Time setting has been met. A Mandatory breath
is delivered if the patient does not spontaneously breathe within
the prescribed BPM setting. This ensures that the patient receives
a minimum number of breaths per minute. In this mode, the Tidal
Volume is delivered during inhalation and PEEP is delivered during
exhalation. The following illustration describes these concepts.
FLOW
6
seconds
50
Enter A/C mode
0
5
-50
Synchronized Intermittent Mandatory Ventilation (SIMV) Mode
In Synchronized Intermittent Mandatory Ventilation (SIMV) mode, the
device delivers both volume control and pressure control therapy.
This mode provides Spontaneous, Assist, and Mandatory breaths.
This mode uses a time window to decide what type of breaths should
be delivered. This time window is the maximum time between
breaths according to the set Breath Rate.
When you enter SIMV mode, the time window is started. If the
patient does not provide any effort, the ventilator will provide a
Mandatory Volume breath when the time expires and then begin the
process again. Mandatory breaths deliver the Tidal Volume setting
during inhalation and provide a lower Peak End Expiratory Pressure
(PEEP) during exhalation.
Trilogy 202 user manual
Tidal Volume = 500 mL
Rate = 10 BPM
Inspiratory Time = 2.0 seconds
Flow Pattern = Square
5 6
seconds seconds
10 15
2 3
= Mandatory Breath
2
= Assist Breath
3
2
20
TIME
Assist Control Mode