170
PATIENT DISCONNECT ALARM
The Patient Disconnect alarm is activated if low inspiratory pressure or the low
exhaled tidal volume is detected during two consecutive breaths. After alarm
activation the unit continues ventilation at the previously set parameters with the
following settings:
1. The flow trigger sensitivity switches to OFF to eliminate false triggering.
2. The ventilator stops oxygen control and keeps the oxygen blender in the
position it was in prior to alarm activation.
The ventilator automatically restores the previous settings when one full breath is
detected.
NOTE During ventilation under high leak conditions (e.g., non-inflated cuff of the
endotracheal tube), a Patient Disconnect alarm is activated if the exhaled
tidal volume criteria is not met. In this case, ventilating the patient in Bi-Level
mode (See Appendix D) is recommended. To disable the Patient Disconnect
alarm see page 156.
An irregular ventilation condition such as patient coughing can cause short
periods of Patient Disconnect alarm.
PATIENT CIRCUIT FAILED ALARM
If the one-way valve at the Wye sensor becomes blocked or is otherwise
inoperable, a Patient Circuit Failed pop-up window appears:
Figure 150: The One-Way Exhalation Valve Pop-up Window
The patient circuit should be replaced at once.
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