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What This Guide Helps With
This guide helps troubleshoot a FiCO2 RATE HIGH ALARM on a Medtronic Capnostream 20p capnography monitor. This alarm indicates the inspired CO2 rate is above the upper alarm limit and may be related to patient condition, ventilation setup, CO2 rebreathing, sampling line placement, accessory issues, or monitor measurement problems.
This alarm should be treated as a patient safety concern first. Clinical Engineering should not assume the device is faulty until the patient, breathing circuit, sampling setup, alarm settings, and external accessories have been checked.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Check the patient immediately and involve clinical staff if the alarm is active, repeated, or associated with respiratory distress, abnormal EtCO2, abnormal SpO2, abnormal pulse rate, or poor waveform quality.
- Do not troubleshoot this as only an equipment issue while the patient may be rebreathing CO2 or experiencing a ventilation problem.
- If monitoring is clinically required and the alarm cannot be quickly explained, move the patient to a backup monitor or alternate monitoring method before continuing equipment checks.
- Expected outcome: Patient assessment and monitoring continuity are addressed before device troubleshooting begins.
Verify the Reported Alarm and Behavior
- Confirm the exact alarm displayed is FiCO2 RATE HIGH ALARM.
- Observe whether the alarm occurs immediately after connection, during active monitoring, after changing tubing or airway accessories, intermittently with movement, or only with one patient setup.
- Check whether the FiCO2 reading is elevated, the capnogram baseline appears abnormal, EtCO2 values are changing, respiratory rate is abnormal, or waveform quality is poor.
- Expected outcome: The reported alarm is confirmed and separated from a misunderstanding, transient artifact, or setup issue.
Confirm the Patient Is Not Actively Rebreathing CO2
- Have clinical staff evaluate the airway, breathing circuit, ventilation status, and patient condition.
- For ventilated or intubated patients, clinical staff should check the circuit, valves, filters, absorber system if applicable, and ventilation setup.
- For non-intubated monitoring, confirm the patient interface and sampling method are appropriate for the patient and care area.
- Expected outcome: A true clinical or ventilation-related cause is addressed or ruled out before the monitor is blamed.
Check the Sampling Line or FilterLine Connection
- Inspect the CO2 sampling line from the patient connection to the Capnostream 20p.
- Look for loose connections, kinked tubing, blocked tubing, moisture, secretions, damaged connectors, contamination, or incorrect accessory type.
- Disconnect and reconnect the sampling line if appropriate.
- Replace the sampling line with a known-good compatible line if there is any doubt about its condition.
- Expected outcome: The alarm clears if inaccurate or abnormal FiCO2 detection was caused by a blocked, contaminated, damaged, or incorrect sampling accessory.
Inspect the Patient Interface or Airway Adapter
- Check the cannula, airway adapter, mask connection, or sidestream sampling point.
- Confirm the interface is correctly placed, not blocked, not contaminated, not connected backward, and not positioned where exhaled gas can be repeatedly sampled as inspired gas.
- Verify the accessory matches the intended monitoring method and patient setup.
- Expected outcome: The sampling setup does not promote false inspired CO2 readings.
Check for Environmental or Setup-Related Causes
- Look for nearby sources of exhaled gas or poor ventilation around the patient interface.
- Check for an oxygen mask trapping exhaled gas, a cannula displaced near the mouth, tubing under bedding, covered airway areas, or improper oxygen delivery setup.
- Correct the sampling position and remove any setup condition that may allow exhaled CO2 to collect near the sampling point.
- Expected outcome: The alarm clears if the monitor was accurately detecting CO2 in the inspired gas path because of setup or environmental conditions.
Review Alarm Limits and Configuration
- Verify the FiCO2 upper alarm limit is appropriate for the care area, patient population, and facility policy.
- Do not silence, widen, or disable alarm limits just to stop the alarm.
- Only authorized clinical staff should adjust alarm limits when clinically appropriate and allowed by policy.
- Expected outcome: The alarm setting is confirmed appropriate or corrected by authorized staff.
Compare With Other Patient Parameters
- Review EtCO2, respiration rate, SpO2, pulse rate, and waveform quality.
- If FiCO2 is high while waveform quality is poor, suspect sampling line, accessory, placement, or setup problems.
- If FiCO2 is high with a valid waveform and related clinical changes, treat it as a patient or ventilation concern.
- Expected outcome: The alarm is interpreted in context instead of being treated as an isolated equipment complaint.
Test With Known-Good Accessories
- If the patient is stable and clinical staff agrees it is safe, replace the sampling line, cannula, airway adapter, or related accessory with known-good compatible parts.
- Observe whether the FiCO2 alarm clears and whether CO2 readings and waveform quality stabilize.
- If the alarm clears, confirm stable operation before returning the monitor to service.
- Expected outcome: Accessory-related causes are ruled in or ruled out without internal device disassembly.
Remove the Monitor From Service if the Alarm Appears False and Persists
- If the FiCO2 RATE HIGH ALARM continues with known-good accessories, correct setup, appropriate alarm limits, and no clinical explanation, remove the Capnostream 20p from service.
- Label the device Out of Service.
- Send the monitor for repair or bench evaluation.
- Expected outcome: A monitor with unresolved CO2 alarm behavior is not left in patient use.
If the Problem Persists
If patient condition, ventilation setup, sampling line placement, accessories, alarm limits, and environmental causes have been ruled out, the alarm may indicate a device measurement problem or internal CO2 monitoring issue.
Remove the device from service, label it Out of Service, and send it for repair or bench evaluation.
Do not continue using a monitor that repeatedly reports a high FiCO2 condition without a confirmed clinical or setup-related cause.
Clinical Use Tip
Never troubleshoot this alarm on an active patient as if it is only an equipment issue. Move the patient to a backup device first if monitoring is required and the alarm cannot be quickly explained. A FiCO2 high alarm may reflect a real ventilation or rebreathing concern.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Capnostream 20p displayed FiCO2 RATE HIGH ALARM during patient monitoring. Staff reported inspired CO2 reading above the upper alarm limit."
Cause
What was observed during troubleshooting.
Example:
"Patient safety confirmed with clinical staff. Sampling line, airway interface, alarm limit, waveform quality, and accessory condition checked. Alarm appeared related to sampling setup/accessory condition."
Resolution
What action was taken.
Example:
"Replaced CO2 sampling accessory and verified stable readings and waveform. Alarm cleared during testing. Monitor returned to service. If alarm had persisted, unit would have been removed from service for bench evaluation."
Helpful Details to Include (If Known)
- Alarm behavior
- Accessories swapped
- Power behavior
- Environmental factors
- Indicator lights
- Final device status
Final Thought
A FiCO2 RATE HIGH ALARM should be handled with patient safety first. Rule out patient condition, ventilation setup, sampling accessories, alarm configuration, and environmental causes before suspecting monitor failure. If the alarm persists without a clear external or clinical cause, remove the device from service and document the work clearly using the CCR method.
That is successful troubleshooting.