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What This Guide Helps With
Troubleshoots abnormal airway pressure caused by circuits, obstructions, leaks, condensation, exhalation components, settings, sensing connections, or device performance.
Step-by-Step Troubleshooting
1. Protect the Patient From Unreliable Ventilation
If airway pressure is unexpectedly high, low, or unstable during patient use, immediately assess the patient clinically and transition to a verified alternate ventilation method when equipment malfunction is suspected.
Do not perform bench troubleshooting while the patient remains dependent on the suspect ventilator.
Expected outcome: The patient has reliable respiratory support while the VOCSN is evaluated separately.
2. Reproduce the Pressure Behavior With a Test Lung
Connect an appropriate test lung using the same circuit type when practical.
Observe whether the high, low, or unstable pressure condition remains present under controlled conditions.
Expected outcome: The problem is distinguished as either patient/circuit-related or reproducible equipment behavior.
If the pressure abnormality does not occur on the controlled setup, investigate the clinical circuit, interface, and patient-related conditions with the clinical team.
3. Inspect the Circuit for Obstruction or Leak
Inspect the complete circuit for:
- Kinks
- Pinched tubing
- Loose connections
- Disconnections
- Water accumulation
- Obstructed filters
- Contaminated exhalation components
- Incorrectly installed accessories
Correct any obvious circuit problem and retest.
Expected outcome: Gas can move through an intact, unobstructed circuit without unintended leakage.
If correcting the circuit stabilizes pressure, proceed to final verification.
4. Inspect Exhalation and Sensing Connections
Verify accessible exhalation components and any external pressure or flow sensing tubing associated with the installed circuit are correctly connected and unobstructed.
Moisture, secretion, or medication residue can affect circuit behavior and should be addressed by replacing affected disposable components where appropriate.
Expected outcome: Exhalation and sensing pathways are correctly assembled and free of obstruction.
5. Verify Settings and Circuit Configuration
Confirm that ventilation mode, pressure-related controls, PEEP, alarm limits, circuit type, and other relevant settings correspond to the intended test configuration.
Compare against the documented clinical prescription or approved test setup rather than making arbitrary adjustments.
Expected outcome: Settings and physical configuration agree and do not explain the abnormal pressure.
If an inadvertent configuration error is corrected and normal pressure returns, troubleshooting can stop after final testing.
6. Substitute Known-Good External Components
When practical, substitute a known-good compatible circuit, filters, exhalation components, and test lung individually.
Observe whether the abnormal pressure follows a particular external component.
Expected outcome: The affected disposable or accessory is isolated, or the pressure problem remains associated with the VOCSN.
7. Verify Pressure With a Calibrated Analyzer
Use approved respiratory test equipment and Ventec checkout procedures to compare delivered and monitored airway pressures under controlled conditions.
Do not perform unauthorized calibration or internal pneumatic adjustment.
Expected outcome: Delivered and monitored pressure values meet applicable manufacturer requirements and remain stable.
If performance is normal after correction of an external cause, the issue is resolved and troubleshooting can stop.
If the Problem Persists
If circuit obstruction, leaks, water, exhalation components, sensing connections, settings, and known-good external components have been ruled out, the problem may involve internal pressure sensing, pneumatic regulation, flow delivery, calibration, or another service-level fault.
The VOCSN should be:
- Removed from service
- Labeled Out of Service
- Sent for repair or bench evaluation
- Evaluated using Ventec Life Systems documentation and calibrated respiratory test equipment
- Repaired or calibrated only by qualified personnel
Complete applicable ventilation, pressure, alarm, and leak verification following repair before return to service.
Knowing when to stop external troubleshooting and escalate is proper troubleshooting.
Clinical Use Tip
A pressure alarm may reflect the patient or circuit rather than the ventilator, but equipment evaluation should occur only after the patient has stable alternate support.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory Therapy reported unstable airway pressure and repeated high-pressure alarms during VOCSN use."
Cause
What was observed during troubleshooting.
Example:
"Clinical Engineering found accumulated condensate partially obstructing the patient circuit."
Resolution
What action was taken.
Example:
"Replaced the affected circuit components, verified stable pressure using a test lung and respiratory analyzer, and confirmed alarm operation before return to service."
Helpful Details to Include (If Known)
- High, low, or unstable pressure complaint
- Exact alarm message
- Ventilation mode
- Circuit type
- Water or obstruction found
- Filter condition
- Exhalation component condition
- Test lung behavior
- Known-good circuit result
- Analyzer verification
- Final alarm test
Final Thought
Abnormal pressure should be approached from the patient and circuit outward before internal failure is assumed. Verify the entire breathing path, configuration, and measured pressure with proper test equipment, then escalate any unexplained or inaccurate pressure behavior.
That is successful troubleshooting.