D- Cpap (Continuous Positive Airway Pressure) - BIO-MED DEVICES CROSSVENT-3+ Operation & Service Manual

VIII THEORY OF OPERATION- cont'd.
D D D D - - - - CPAP (Continuous Positive Airway Pressure) CPAP (Continuous Positive Airway Pressure)
CPAP (Continuous Positive Airway Pressure) CPAP (Continuous Positive Airway Pressure)
In the CPAP mode, the breaths are delivered in exactly the same manner as a spontaneous breath in the
SIMV mode. Each breath is triggered by the patient's inspiratory effort. Gas flows to the patient for a
period of time equal to the inspiratory time of a normal assisted breath (established with the Tidal Volume
and Flow controls). The flow rate during a CPAP breath is set with the Flow control. During CPAP breaths,
Maximum Pressure is inactive and the gas is delivered at zero or CPAP pressure. The full volume is made
available at the proximal airway, with additional boluses available with continued effort until the patient is
satisfied. Whatever gas is not inspired by the patient is vented to atmosphere.
Pressure Support: See SIMV above.
WARNING: It is extremely important that the Pressure Trigger control be carefully
adjusted to assure proper operation in the CPAP mode.
WARNING: Under certain conditions in CPAP, in particular with high flows and low
CPAP pressures, if the low peak pressure alarm is set so that no false alarms occur,
this alarm may be inoperative if a disconnect occurs.
important to have the low PEEP/CPAP and low exhaled tidal volume (if installed)
alarms set correctly.
It is therefore extremely
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