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What This Guide Helps With
Addresses high-pressure alarms caused by circuit restriction, filters, water, expiratory obstruction, settings, accessories, or ventilator-related pressure-control problems.
Step-by-Step Troubleshooting
1. Protect the Patient First
Clinical staff should immediately assess the patient, airway, and ventilation when a high airway pressure alarm occurs. If effective ventilation is uncertain, move the patient to another verified ventilator or use an appropriate alternate ventilation method. Expected outcome: Patient ventilation is stabilized before equipment troubleshooting.
2. Reproduce the Condition on a Test Load
After removing the ventilator from patient use, connect an appropriate test lung and determine whether the high-pressure alarm recurs. Expected outcome: The alarm is either confirmed as an equipment/setup issue or does not reproduce outside the clinical condition.
3. Inspect the Circuit
Check inspiratory and expiratory tubing for kinks, trapped water, blocked connectors, pinched tubing, caps, or incorrect assembly. Expected outcome: The breathing circuit is unobstructed. If correcting an obstruction resolves the alarm, proceed to final verification.
4. Check Filters and Inline Accessories
Inspect filters, HMEs, humidification components, adapters, and other accessories for restriction or incorrect installation. Expected outcome: All components permit normal gas flow. Replace any restricted accessory.
5. Inspect the Expiratory Cassette
Confirm the cassette is fully seated, correctly prepared, and free from obvious external obstruction or damage. Expected outcome: The expiratory path is externally normal.
6. Review Settings
Review applicable pressure targets, pressure limits, PEEP, tidal volume, and alarm settings. Do not increase limits simply to eliminate an alarm. Expected outcome: Settings are appropriate for controlled bench testing and do not explain an expected high-pressure alarm.
7. Use a Known-Good Test Circuit
Replace the circuit and external accessories with known-good compatible components. Expected outcome: The alarm disappears if an external circuit component was responsible.
8. Evaluate Pressure Response
Observe pressure delivery with the test lung and use approved ventilator test equipment where required. Expected outcome: Pressure rises and stabilizes predictably. Uncommanded or excessive pressure requires removal from service.
9. Verify Alarm Performance
Create a controlled high-pressure condition to confirm the alarm activates and clears appropriately after the test condition is removed. Expected outcome: High-pressure alarm operation is normal. Troubleshooting can stop after successful testing.
10. Escalate Persistent High Pressure
If excessive pressure or the alarm persists with an unrestricted known-good circuit and appropriate settings, stop troubleshooting. Expected outcome: The ventilator remains out of service for qualified internal evaluation.
If the Problem Persists
Common external restrictions, filters, circuit components, cassette issues, and settings have been ruled out. The remaining cause may involve pneumatic control, pressure sensing, expiratory regulation, turbine control, calibration, or electronics. Remove the Servo-air Lite from service, label it Out of Service, and send it for bench evaluation using appropriate Getinge documentation and approved ventilator test equipment. Complete pressure, volume, alarm, and pre-use verification after repair. Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
A high-pressure alarm is first a patient and airway concern; equipment troubleshooting comes only after clinical causes and ventilation safety are addressed.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory Therapy reported recurrent high airway pressure alarms from the Servo-air Lite during setup."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found an occluded inline filter increasing breathing-circuit resistance."
Resolution
What action was taken.
Example:
"Clinical Engineering replaced the filter, verified normal pressure delivery and alarm operation with a test lung, completed the pre-use check, and returned the ventilator to service."
Helpful Details to Include (If Known)
- Alarm timing
- Clinical or bench occurrence
- Circuit restriction
- Water accumulation
- Filter condition
- Expiratory cassette status
- Settings observed
- Test-lung result
- Alarm verification
- Final device status
Final Thought
Patient assessment comes first, followed by systematic external inspection and controlled testing before internal pressure-control failure is considered. That is successful troubleshooting.