3-1
DMR V4C 3.3 (User Manual) V-4 06-May-2022
3 Alarms and Troubleshooting
WARNING:
While the ventilator is in use, an alternative means of ventilation should always be available in
the event of a ventilator problem. This is particularly true for ventilator-dependent patients.
Supplementary observation, appropriate for the patient's condition, is also recommended.
WARNING:
This manual tells you how to respond to and troubleshoot issues with the V4C-O2E Oxygen
Mixer, but it does NOT tell you how to respond to the patient. Always examine the patient first
before examining the ventilator and Oxygen Mixer.
WARNING:
Do not allow a patient to remain connected to the ventilator when ventilation is stopped,
because a substantial quantity of expiratory gas, primarily carbon dioxide, may be inhaled by
the patient. In some circumstances, inhaling carbon dioxide may lead to under-ventilation,
suffocation, and serious injury or death.
WARNING:
The inspiration trigger threshold should be carefully modified in order to avoid the risk of false
triggering or “autotriggering” of the ventilator. The least sensitive setting may result in
autotriggering. In these scenarios, auto-triggering may be reduced by decreasing the FiO
2
level
or using an inspiratory bacterial filter with a higher flow resistance. Always set an appropriate
“Max Rtot” alarm limit when using inspiration triggering with the V4C-O2E Oxygen Mixer.
WARNING:
In the event of power loss to the ventilator, oxygen delivery to the Oxygen Mixer will cease
immediately. Safety valves on the V4C-O2E Oxygen Mixer ensure that room air is always
available to the ventilator in all fault conditions, including in an oxygen loss scenario.
WARNING:
Never use the V4C-O2E Oxygen Mixer and the low pressure oxygen port of the compatible
ventilator simultaneously. Only one source of oxygen can be delivered to the ventilator during
use.
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