Specifications

14
In EPAP, the BiPAP S/T system responds as necessary to maintain the preset pressure in the presence of
the patient's expiratory flows.
See the Principles of Operation section for information on trigger and cycle criteria for assisted breaths.
Refer to Figures 2 and 3 for examples and diagrams.
Spontaneous (S): Function Selector Knob: Spontaneous (S)
Active Controls: IPAP, EPAP
In the S mode, the patient is in control of the respiratory rate. When the unit is triggered to IPAP, the
BiPAP S/T system immediately diverts flow to the patient circuit to establish the preset pressure and
satisfy the patient’s inspiratory demand.
If the patient actively participates throughout the IPAP phase, the BiPAP S/T system responds as
necessary to satisfy the patient's flow requirements while maintaining the preset pressure. Under these
conditions, the patient is active in determining 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 tidal volume will depend upon the pressure differential between the IPAP and
EPAP levels and the combined resistance and compliance of the circuit and the patient.
Modes of Operation
Chapter 5 Modes of Operation
Continuous Positive Airway Pressure (CPAP)
CPAP can be delivered as follows:
Function Selector Knob: EPAP/CPAP
Active Control: EPAP
Note: The active pressure control being used actually indicates the level of CPAP being delivered. In the
CPAP mode, the patient breathes spontaneously at the indicated pressure level. The patient is in
total control of both rate and tidal volume. The BiPAP S/T system responds as necessary to satisfy
the patient’s flow demand and circuit leak while maintaining the preset pressure at a stable level.
V
P
est
5 cm H O
2
1 second
60 L/min.
1 second
60 L/min.
0
Example:
CPAP = 10 cm H
2
O
Figure 1