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Chapter 3 Modes, Features, and Alarms
23
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 eort.
The duration of a Mandatory breath is determined by the inspiratory
time setting. The following illustration describes these concepts.
= Pressure Supported
Spontaneous Breath
= Mandatory Breath
(note longer inspiratory
time)
IPAP = 26 cm H
2
O
EPAP = 6 cm H
2
O
Rate = 10 BPM
PS = IPAP-EPAP = 20 cm H
2
O
1 1
1
1
2
2
6
10
20
26
Enter S/T mode
5 10 15 20
PRESSURE
6 seconds
TIME
6 seconds 6 seconds
S/T Mode