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What This Guide Helps With
High airway pressure alarms occur because of circuit obstruction, patient-side resistance, condensate, accessory problems, settings, or ventilator-related pressure-control issues.
Step-by-Step Troubleshooting
1. Protect the Patient and Assess Ventilation
A high airway pressure alarm can indicate a patient or airway emergency. Clinical staff should immediately assess the patient and airway.
If ventilator performance is in doubt, disconnect the patient from the suspect ventilator and provide appropriate backup ventilation.
Do not bench-troubleshoot the ventilator while the patient depends on it.
Expected outcome: The patient is receiving safe, effective ventilation before equipment investigation begins.
2. Confirm Whether the Alarm Follows the Device
After the ventilator is removed from patient dependence, connect an appropriate test lung and reproduce the reported settings as closely as safely possible.
Determine whether the high-pressure alarm occurs on the test lung.
Expected outcome: The issue is separated into a likely patient/circuit condition or a reproducible equipment-related problem.
3. Inspect the Breathing Circuit
Inspect the inspiratory and expiratory limbs for:
- Kinks
- Pinched tubing
- Occlusion
- Water accumulation
- Blocked filters
- Misassembled components
- Closed or obstructed ports
Correct any external obstruction.
Expected outcome: The breathing path is open and unobstructed. If the alarm clears and does not recur during testing, troubleshooting can stop after verification.
4. Inspect Circuit Accessories
Check humidifiers, filters, nebulizer components, connectors, and other installed accessories for incorrect assembly, obstruction, water accumulation, or excessive resistance.
Use known-good compatible accessories when appropriate.
Expected outcome: Accessories are correctly installed and do not cause excessive circuit resistance.
5. Verify the Expiratory Cassette
Confirm the cassette is correctly seated, clean, dry, and free of visible obstruction or damage.
If available, compare with a known-good compatible cassette.
Expected outcome: Expiratory flow is not restricted by an improperly seated or contaminated cassette.
6. Review Ventilator Settings
Verify the reported pressure limits, ventilation mode, target values, and other accessible settings match the intended clinical setup.
Do not change patient-prescribed settings merely to silence an alarm.
Expected outcome: No accidental or inappropriate setting explains the alarm during bench testing.
7. Perform Controlled Functional Testing
Using a test lung and approved ventilator analyzer, observe airway pressure and confirm the ventilator responds appropriately during controlled ventilation.
Expected outcome: Delivered pressure and alarm response behave consistently during testing.
8. Verify High-Pressure Alarm Function
Create an appropriate controlled condition using approved test procedures to verify the ventilator detects and annunciates a high-pressure condition.
Expected outcome: The high-pressure alarm activates appropriately and clears when the condition is removed.
9. Escalate Unexplained High Pressure
If excessive airway pressure is reproduced with a normal test lung and unobstructed circuit, stop external troubleshooting.
Expected outcome: A ventilator with potentially abnormal pressure delivery is prevented from returning to patient care.
If the Problem Persists
Patient-related conditions, external circuit obstruction, accessories, expiratory cassette seating, and accessible settings have been ruled out. Remaining causes may involve internal pneumatic control, pressure sensing, expiratory control, calibration, or other service-level systems.
The ventilator should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using appropriate Getinge documentation and approved test equipment
- Repaired or calibrated only by qualified personnel
Complete full ventilator-performance and alarm testing before return to service. Knowing when to stop external troubleshooting is proper troubleshooting.
Clinical Use Tip
Always separate patient causes from ventilator causes by moving the patient to safe ventilation first and then reproducing the complaint on a test lung.
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-c."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found condensate partially obstructing the expiratory limb of the breathing circuit."
Resolution
What action was taken.
Example:
"The circuit was corrected, controlled ventilation on a test lung was stable, and high-pressure alarm operation was verified before return to service."
Helpful Details to Include (If Known)
- Alarm wording
- Ventilation mode and settings observed
- Patient circuit condition
- Condensate or obstruction found
- Filters and accessories checked
- Expiratory cassette condition
- Test lung result
- Analyzer pressure result
- Alarm verification
- Final device status
Final Thought
Treat high airway pressure as a patient-safety issue first, verify the entire external breathing path before suspecting the ventilator, and remove the device from service if abnormal pressure delivery can be reproduced.
That is successful troubleshooting.