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What This Guide Helps With
Troubleshoot inaccurate PEEP or airway pressure caused by circuit leaks, accessories, expiratory components, sensing connections, configuration, or internal pneumatic control.
Step-by-Step Troubleshooting
1. Protect the Patient and Stop Clinical Use
A ventilator that cannot control or measure airway pressure reliably must not remain in use on a patient.
Transfer the patient to another verified ventilator before performing pressure troubleshooting.
Expected outcome: The patient continues receiving safe ventilatory support and the affected Evita XL is removed from clinical dependence.
2. Confirm the Pressure Verification Failure
Connect the ventilator to an appropriate test lung and approved ventilator analyzer. Reproduce the reported PEEP or airway-pressure discrepancy using the applicable verification procedure.
Document both the ventilator display and independent analyzer result.
Expected outcome: The discrepancy is confirmed objectively. If independent testing shows normal performance, investigate the original test setup before assuming ventilator failure.
3. Verify the Test Setup
Inspect analyzer connections, tubing, test lung, adapters, and measurement configuration. Confirm that the test setup itself is not leaking or introducing resistance.
Use an independently verified analyzer when available if the results are unexpected.
Expected outcome: The test system is correctly connected and suitable for pressure verification. If correcting the test setup produces normal results, troubleshooting can stop.
4. Inspect the Breathing Circuit for Leaks
Check the inspiratory and expiratory limbs, patient connection, filters, humidifier components, water traps, caps, and adapters for loose connections, cracks, or leaks.
Expected outcome: The circuit is intact and leak-free. If correcting a circuit leak restores pressure performance, complete the device check and stop troubleshooting.
5. Inspect the Expiratory Valve and Related External Components
Check that the expiratory valve is correctly installed, clean, intact, and fully seated. Inspect accessible valve-related components for contamination or moisture.
An expiratory valve problem can affect pressure regulation and PEEP.
Expected outcome: The expiratory valve is correctly installed and functioning through the normal device check. If correction restores pressure control, troubleshooting can stop after verification.
6. Check Filters, Accessories, and Circuit Resistance
Inspect external filters, humidification components, adapters, and other accessories for obstruction, saturation, contamination, or incorrect placement.
Remove or substitute suspect accessories during controlled testing when appropriate.
Expected outcome: No external accessory is adding unintended resistance or affecting pressure control. If a defective accessory is identified, replace it and repeat verification.
7. Verify Relevant Settings and Configuration
Confirm that the ventilator mode, pressure settings, PEEP setting, circuit configuration, and other user-accessible parameters match the intended verification setup.
Do not alter service calibration values or enter unauthorized configuration menus.
Expected outcome: The test configuration matches the intended pressure verification procedure. If correcting a setup error restores normal performance, troubleshooting can stop.
8. Substitute Known-Good External Components
Use a known-good circuit, expiratory valve, filters, and other relevant external accessories when available.
Change one variable at a time to isolate the source.
Expected outcome: Normal pressure performance with known-good external components identifies the original accessory or circuit component as the cause.
9. Repeat Pressure Verification Across Appropriate Conditions
Using approved test equipment, repeat pressure and PEEP verification after external corrections. Observe for instability, overshoot, drift, or inconsistent pressure control.
Use only manufacturer or facility-approved acceptance criteria; do not invent tolerances.
Expected outcome: Measured PEEP and airway-pressure control meet the applicable verification requirements. If they do, complete final return-to-service testing and stop troubleshooting.
10. Escalate Persistent Pressure-Control Failure
If the test system, circuit, expiratory valve, accessories, and settings are verified but pressure remains outside approved tolerance, stop external troubleshooting.
Possible causes include internal pressure sensing, pneumatic regulation, valves, calibration, or control-system problems.
Expected outcome: The ventilator is removed from service and sent for qualified bench evaluation.
If the Problem Persists
External leakage, circuit resistance, expiratory components, test setup, settings, and known-good substitutions have been ruled out.
Remove the Evita XL from service, label it Out of Service, and send it for repair or bench evaluation. Qualified personnel should use appropriate Drager documentation and approved ventilator analyzers to evaluate internal pressure sensing, regulation, calibration, and pneumatic control.
After repair, complete pressure and PEEP verification, the full device check, alarm testing, ventilation performance testing, and all required return-to-service procedures.
Clinical Use Tip
Never return a ventilator to patient use when airway-pressure or PEEP performance fails independent verification, even if the displayed values appear reasonable.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory Therapy reported that the Evita XL failed PEEP verification during pre-use testing."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found a leaking connection in the external breathing circuit that caused measured PEEP to fall below the intended test value."
Resolution
What action was taken.
Example:
"The leaking circuit component was replaced, PEEP and airway pressure passed verification with an approved analyzer, and the ventilator was returned to service."
Helpful Details to Include (If Known)
- Pressure parameter that failed
- Ventilator setting used
- Independent analyzer result
- Test lung and circuit configuration
- Leak findings
- Expiratory valve condition
- Filters or accessories tested
- Known-good substitutions
- Results before and after correction
- Complete device-check result
- Final device status
Final Thought
Patient safety comes first whenever pressure control is uncertain. Verify the test setup and complete external breathing circuit before assuming an internal pneumatic failure, use approved measurement criteria, escalate unresolved discrepancies, and document the final verified condition.
That is successful troubleshooting.