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What This Guide Helps With
Alarm: VTE Low (Mandatory) indicating delivered tidal volume is below the set mandatory volume, which can result in inadequate ventilation due to leaks, disconnections, or patient-related compliance or resistance changes.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Immediately assess the patient’s ventilation status
- Provide alternate ventilation if needed (bag-valve mask or backup ventilator)
- Confirm oxygenation and chest rise
Verify the Reported Alarm and Behavior
- Confirm the “VTE Low (Mandatory)” alarm is active
- Observe if it occurs during mandatory breaths
- Check displayed tidal volume versus set value
- Look for related alarms (low pressure, leak)
Check Patient Circuit for Leaks (Most Common Cause)
- Inspect all circuit connections from ventilator to patient
- Ensure tubing is fully seated and secure
- Look for cracks, loose fittings, or disconnections
Check Artificial Airway or Interface
- Verify ET tube or mask positioning
- Check cuff inflation if applicable
- Assess for dislodgement or partial extubation
Assess Patient Condition
- Evaluate for increased airway resistance (secretions, bronchospasm)
- Assess lung compliance changes
- Observe for patient-ventilator asynchrony
Review Ventilator Settings
- Verify set tidal volume and pressure limits
- Check if pressure limits are restricting delivery
- Adjust settings as clinically appropriate with care team
Perform System Self Test (SST) if Issue Persists
- Remove ventilator from patient use
- Run system self test per protocol
- Verify system passes all checks
If the Problem Persists
If all external causes such as circuit leaks, airway issues, patient factors, and settings have been ruled out:
- Remove the ventilator from service
- Label the device as Out of Service
- Send for repair or bench evaluation
Clinical Use Tip
Never troubleshoot low tidal volume alarms on an active patient—always ensure the patient is transitioned to a backup device before troubleshooting.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Alarm: VTE Low (Mandatory); ventilator delivering lower-than-set tidal volumes during mandatory breaths."
Cause
What was observed during troubleshooting.
Example:
"Leak identified at circuit connection (or no external issue found, suspected internal flow/volume issue)."
Resolution
What action was taken.
Example:
"Re-secured circuit connection and verified normal VTE delivery (or removed from service and sent for repair after failed SST)."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
Low tidal volume alarms directly impact patient ventilation and must be addressed immediately. Always start with external leak checks, assess patient factors, and escalate when unresolved.
That is successful troubleshooting.