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What This Guide Helps With
This guide assists Clinical Engineering in troubleshooting situations where a Vyaire VELA ventilator delivers inconsistent flow, pressure, or tidal volumes. Symptoms may include alarms for high/low tidal volume, unusual pressure readings, patient discomfort, or clinician concerns about the accuracy of delivered breaths. The focus is on external and easily verifiable checks before considering internal failure.
Step-by-Step Troubleshooting
Verify Power and Battery
- Ensure the ventilator is properly powered and battery is charged.
- Check for battery low warnings or unexpected shutdowns.
- Why: Inadequate power can cause the ventilator to deliver inconsistent parameters.
Inspect Circuit Connections
- Confirm all tubing, connectors, and patient interfaces are properly connected and secure.
- Check for kinks, loose connections, or condensation in the tubing.
- Why: Leaks or disconnections directly affect delivered flow, pressure, and tidal volume.
Check Filters and Humidifiers
- Verify that bacterial/HEPA filters are clean and not obstructed.
- Ensure the humidifier (if used) is properly seated and operational.
- Why: Obstructions increase resistance, affecting volume and pressure delivery.
Review Ventilator Settings
- Confirm clinician-prescribed settings match ventilator parameters (mode, tidal volume, PEEP, inspiratory time, FiO₂).
- Ensure no unintended changes or software errors have altered settings.
- Why: Misconfigured settings may appear as discrepancies in delivered parameters.
Observe Patient Interface
- Inspect mask, endotracheal tube, or tracheostomy interface for leaks or poor fit.
- Check for signs of patient coughing, secretions, or obstruction.
- Why: Patient-related leaks or airway resistance can mimic ventilator delivery issues.
Run Basic Self-Test
- Perform the ventilator’s built-in test routine following manufacturer instructions.
- Note any failures or warnings reported.
- Why: Self-tests help identify external versus internal faults.
If the Problem Persists
Common external causes (connections, leaks, filters, power) have been ruled out.
- Remove the ventilator from service.
- Label as Out of Service.
- Send for repair or bench evaluation by qualified service personnel.
Knowing when to stop is a key part of proper troubleshooting.
Clinical Use Tip
- Never troubleshoot flow or tidal volume issues while the patient is actively ventilated.
- Move the patient to a backup ventilator first.
- Only perform troubleshooting when patient safety is ensured.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
“Ventilator tidal volumes are inconsistent and pressures fluctuate unexpectedly.”
Cause
What was observed during troubleshooting.
Example:
Observed secure tubing, clean filters, correct settings, but discrepancies persist. No external leaks or obstructions noted.
Resolution
What action was taken.
Example:
Device removed from service, labeled Out of Service, sent for repair. Patient safely transferred to alternate ventilator.
Helpful Details to Include
- Outlet tested and verified
- Tubing and connectors checked for kinks or leaks
- Filters and humidifiers inspected
- Alarm behavior noted
- Any unusual sounds, heat, or odors observed
- Final device status recorded
Final Thought
Flow, pressure, and tidal volume discrepancies can stem from multiple sources. Logical, stepwise troubleshooting ensures patient safety, prevents misdiagnosis of ventilator faults, and preserves accurate documentation for repair. Escalating to service when external factors are ruled out is proper procedure.
That is successful troubleshooting.