Specifications

15
Modes of Operation
V
P
est
5 cm H O
2
1 second
60 L/min.
1 second
60 L/min.
0
Figure 2
V
P
est
5 cm H O
2
1 second
60 L/min.
1 second
60 L/min.
0
Example:
IPAP = 15 cm H
2
O
EPAP = 4 cm H
2
O
Figure 3
Example:
IPAP = 15 cm H
2
O
EPAP = 10 cm H
2
O
Spontaneous/Timed Function Selector Knob: Spontaneous/Timed (S/T)
(S/T): Active Controls: IPAP, EPAP, BPM
In the S/T mode, the patient is in control of the respiratory rate as long as it exceeds the BPM setting. The
BPM control determines the minimum respiratory rate delivered by the unit. If the unit does not detect a
spontaneous trigger within the interval determined by the BPM setting, it will activate a timed trigger to
the IPAP level. Once triggered to IPAP, the balance of the cycle continues as in the S mode. Any IPAP
trigger, whether spontaneous or timed, resets the interval timer.
If the patient actively participates throughout the IPAP phase, the pressure system responds as necessary
to satisfy the patient’s flow requirements while maintaining the preset pressure. Under these conditions,
the patient and the pressure differential determine inspiratory time and tidal volume. If the patient does
not actively participate, the BiPAP S/T system responds with the flow required to maintain the preset
pressure. The delivered inspiratory time and tidal volume will be dependent upon the pressure
differential between the IPAP and EPAP levels and the combined resistance and compliance of the
circuit and the patient.