S/T Mode - Respironics V60 User Manual

Principles of operation
4-10

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. 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.
Pressure
Rise
IPAP
EPAP
Patient-triggered (Spont)
spontaneous breath with
pressure support
Figure 4-11: S/T pressure waveform
Figure 4-10: S/T controls
Mandatory
(Timed) breath
1/Rate
I-Time
Time