Chapter 4
4-10 Respironics V60 Ventilator User Manual 1047358 Rev N
Principles of operation
S/T mode
The S/T (spontaneous/timed) mode guarantees breath delivery at the user-set
rate. It delivers pressure-controlled, time-cycled mandatory and pressure-
supported spontaneous breaths, all at the IPAP pressure level. If the patient
fails to trigger a breath within the interval determined by the Rate setting, the
ventilator triggers a mandatory breath with the set I-Time. You set no patient
triggering or cycling sensitivities: the patient triggers and cycles based on the
ventilator’s Auto-Trak Sensitivity algorithms. The control settings active in the
S/T mode are shown in Figure 4-10. Figure 4-11 shows an S/T mode pressure
waveform.
Figure 4-10: S/T controls
Figure 4-11: S/T pressure waveform
Pressure
EPAP
IPAP
I-Time
1/Rate
Patient-triggered (Spont)
spontaneous breath with
pressure support
Mandatory
(Timed) breath
Time
Rise
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