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What This Guide Helps With
Addresses high-pressure alarms caused by tubing obstruction, water, filters, patient-interface issues, settings, expiratory restriction, or ventilator malfunction.
Step-by-Step Troubleshooting
1. Protect the Patient First
A high airway pressure alarm during clinical use can represent a patient, airway, or equipment emergency. Clinical personnel should immediately assess the patient and airway and provide alternate ventilation if adequate ventilation cannot be confirmed.
Clinical Engineering should troubleshoot the device only after patient care is stabilized.
Expected outcome: The patient is safely ventilated independently of any questionable equipment.
2. Confirm Whether the Alarm Is Device-Related
Use an appropriate test lung after the ventilator is removed from the patient. Reproduce the operating configuration if safe and note when the high-pressure alarm occurs.
Expected outcome: The alarm either reproduces on a test load, indicating an equipment/setup issue, or does not reproduce, suggesting the clinical circuit or patient condition may have contributed.
3. Inspect the Breathing Circuit for Obstruction
Check the inspiratory and expiratory limbs for:
- Kinks
- Pinched tubing
- Water accumulation
- Blocked connectors
- Obstructed filters
- Closed valves or caps
- Incorrect circuit assembly
Expected outcome: The circuit is open and correctly assembled. If removing an obstruction eliminates the alarm, troubleshooting can stop after complete functional verification.
4. Inspect Filters and Accessories
Check bacterial/viral filters, HMEs, humidification components, nebulizer adapters, and other inline accessories for restriction or incorrect orientation.
Substitute known-good compatible components where appropriate.
Expected outcome: External accessories provide an unrestricted gas path. A restricted component that causes the alarm is replaced.
5. Inspect the Expiratory Cassette
Verify the expiratory cassette is correctly seated, clean, properly prepared, and free from obvious obstruction or damage.
Expected outcome: Exhaled gas can pass through the expected expiratory path without obvious external restriction.
6. Verify Ventilator Settings
Review the selected mode, pressure limits, PEEP, tidal volume or pressure targets, flow-related settings, and alarm settings as applicable.
Do not alter clinical settings simply to silence the alarm. For bench testing, use an appropriate controlled configuration.
Expected outcome: Settings are internally consistent with the intended test setup and are not causing an expected alarm response.
7. Test With a Simplified Known-Good Circuit
Replace the patient circuit and external accessories with a known-good compatible test configuration.
Expected outcome: The high-pressure alarm no longer occurs. Reintroduce components individually if necessary to locate an external restriction.
8. Check for Abnormal Ventilator Output
Observe pressure response on an appropriate test lung and, when required, use approved ventilator test equipment.
Listen for unusual turbine noise and observe for abnormal pressure rise that occurs despite an unrestricted circuit.
Expected outcome: Pressure responds predictably to test conditions. Unexpected pressure behavior requires removal from service.
9. Verify Alarm Function
After correcting the cause, intentionally create an appropriate controlled high-pressure condition using approved testing methods to confirm the alarm activates and clears correctly.
Expected outcome: The alarm operates normally and ventilation resumes appropriately after the test condition is removed.
10. Escalate if the Alarm Persists
If high pressure occurs with a known-good unrestricted circuit and appropriate test setup, discontinue external troubleshooting.
Expected outcome: The ventilator remains out of service for service-level evaluation.
If the Problem Persists
Common external restrictions, accessories, cassette conditions, and settings have been ruled out. Persistent high pressure may involve internal pneumatic control, expiratory regulation, pressure sensing, turbine control, calibration, or electronics.
Remove the ventilator 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, pre-use, and other applicable performance testing before return to service.
Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
Do not assume a high airway pressure alarm is an equipment problem until the patient and airway have been clinically assessed.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory Therapy reported repeated high airway pressure alarms on the Servo-air during setup."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found a kinked expiratory circuit limb restricting gas flow."
Resolution
What action was taken.
Example:
"Clinical Engineering replaced the affected circuit, verified normal ventilation and high-pressure alarm operation with a test lung, completed the pre-use check, and returned the ventilator to service."
Helpful Details to Include (If Known)
- When alarm occurred
- Clinical versus bench occurrence
- Circuit configuration
- Filters and accessories inspected
- Water or obstruction found
- Expiratory cassette condition
- Settings observed
- Test-lung result
- Alarm verification result
- Final device status
Final Thought
High-pressure alarms require patient assessment first, followed by methodical inspection for external restrictions and setup problems before internal malfunction is considered.
That is successful troubleshooting.