PHILIPS Respironics Trilogy 202 User Manual page 32

Spontaneous/Timed (S/T) Mode
In Spontaneous/Timed (S/T) mode, the device delivers bi-level
pressure support. This mode provides Spontaneous and Mandatory
breaths. A Mandatory breath is delivered if the patient does not
spontaneously breathe within the prescribed Breath Rate (BPM)
setting. This ensures that the patient receives a minimum number
of breaths per minute. In this mode, an IPAP is delivered during
inhalation and a lower EPAP is delivered during exhalation. The
duration of a Spontaneous breath is determined by the patient effort.
The duration of a Mandatory breath is determined by the inspiratory
time setting. The following illustration describes these concepts.
PRESSURE
6 seconds
26
20
10
1
6
Enter S/T mode
5
IPAP = 26 cm H O
2
EPAP = 6 cm H O
2
Rate = 10 BPM
PS = IPAP- EPAP = 20 cm H O
2
6 seconds
1
10 15
= Pressure Supported
1
Spontaneous Breath
= Mandatory Breath
2
(note longer inspiratory
time)
6 seconds
2 1
20
TIME
Chapter 3 Modes, Features, and Alarms
S/T Mode
23