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What This Guide Helps With
This guide assists Clinical Engineering in troubleshooting situations where the Avalon FM20 fetal monitor incorrectly displays maternal heart rate (MHR) as fetal heart rate (FHR) or shows cross-talk between signals. These errors can compromise fetal monitoring accuracy. Most causes are external or related to sensor placement, signal interference, or monitor setup rather than internal hardware failures.
Step-by-Step Troubleshooting
Verify Sensor Placement
- Check that the maternal ECG or TOCO and fetal sensors are correctly positioned according to the manufacturer’s guidelines.
- Misplaced sensors can cause the monitor to confuse maternal and fetal signals.
Inspect Sensor Condition
- Examine abdominal and maternal electrodes for wear, damage, or dried gel.
- Replace any faulty or dried electrodes; poor contact can lead to inaccurate readings.
Check Cable Connections
- Ensure all leads are fully seated in the monitor ports.
- Loose or corroded connections can introduce signal interference.
Swap Electrodes or Leads if Needed
- If the monitor continues to show cross-talk, swap the maternal or fetal leads with known-good ones.
- This helps identify if the problem is with the cable or connector rather than the monitor.
Reduce Signal Interference
- Remove or distance other electrical equipment nearby (infusion pumps, phones, monitors).
- Electrical interference can cause the monitor to misinterpret signals.
Verify Monitor Settings
- Confirm the monitor’s maternal/fetal detection settings are correct.
- Reset to default configuration if uncertain; misconfigured settings may contribute to misreadings.
Perform a Self-Test or Signal Check
- Use the monitor’s internal test functions if available to verify sensor detection and signal processing.
If the Problem Persists
External causes have likely been ruled out.
- The monitor should be removed from service, labeled Out of Service, and sent for repair or bench evaluation.
- Escalation is critical to ensure accurate fetal monitoring and patient safety.
Clinical Use Tip
- Never troubleshoot on an active patient without backup monitoring.
- Move the patient to another working monitor if cross-talk or misreading persists before further evaluation.
- Ensure electrodes are always applied securely and clean skin contact is maintained.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
“Fetal monitor shows maternal heart rate as fetal heart rate and exhibits cross-talk.”
Cause
What was observed during troubleshooting.
Example:
“Maternal and fetal electrodes were incorrectly placed and one lead showed poor contact. No internal hardware fault detected.”
Resolution
What action was taken.
Example:
“Electrodes repositioned per manufacturer guidelines. Leads replaced where necessary. Monitor verified with test strip; cross-talk resolved.”
Helpful Details to Include
- Check for electrode integrity and gel condition.
- Verify correct port connections.
- Note any alarm messages or unusual monitor behavior.
- Document final monitor status after troubleshooting.
Final Thought
Accurate maternal and fetal heart rate monitoring is critical for patient safety. Start with external checks and logical troubleshooting steps, escalating to repair only when necessary. Thorough CCR documentation ensures clear communication and proper follow-up.
That is successful troubleshooting.