Schiller CARDIOVIT AT Series

Asset Type

Electrocardiograph (EKG) Machine

Manufacturer

Schiller

Model

CARDIOVIT AT Series

What This Guide Helps With

Lead fail messages, noisy ECG waveform, or poor signal acquisition caused by electrodes, lead wires, or connection issues.

Step-by-Step Troubleshooting

Ensure Patient Safety First

• If the ECG is being used for diagnosis, ensure the patient is stable and move to another functioning EKG machine if needed.
• Expected: Monitoring or ECG acquisition continues safely.
• Why it matters: Poor signal quality can lead to misinterpretation or missed cardiac events.

Verify the Reported Issue

• Attempt to acquire an ECG and observe the waveform and messages.
• Check for:
  • Lead fail alerts (specific lead vs multiple leads)
  • No signal vs noisy signal
  • Baseline wander or artifact
• Expected: Issue is reproducible and identifiable.
• Why it matters: Determines if the issue is isolated or system-wide.

Inspect Electrode Placement and Condition

• Check all patient electrodes.
• Actions:
  • Confirm proper anatomical placement
  • Replace dried, loose, or expired electrodes
  • Clean skin (remove oils, sweat, hair if needed)
• Expected: Secure electrode adhesion and improved signal.
• Why it matters: Poor electrode contact is the most common cause of signal issues.

Check Lead Wire Connections (Patient Cable)

• Inspect the lead wires from electrodes to the trunk cable.
• Actions:
  • Ensure each lead is firmly connected to electrodes
  • Look for broken clips, corrosion, or bent connectors
  • Reattach any loose leads
• Expected: All leads are securely connected.
• Why it matters: Loose or damaged connectors cause intermittent or failed signals.

Inspect and Swap Patient Cable (Lead Set)

• Evaluate the full patient cable assembly.
• Actions:
  • Check for cuts, kinks, or exposed wiring
  • Gently manipulate cable while observing waveform
  • Swap with a known good cable if available
• Expected: Signal stabilizes with a known good cable.
• Why it matters: Internal cable breaks are common and often intermittent.

Check Trunk Cable Connection to the Unit

• Inspect where the patient cable connects to the EKG machine.
• Actions:
  • Ensure connector is fully seated and locked
  • Check for bent pins or debris in the port
  • Reseat the cable
• Expected: Secure connection with no damage.
• Why it matters: Poor connection at the device can affect all leads.

Minimize Electrical Interference

• Evaluate the environment around the patient.
• Actions:
  • Move cables away from power cords or equipment
  • Ensure patient is not touching metal surfaces
  • Reduce nearby electrical devices if possible
• Expected: Reduced noise and cleaner waveform.
• Why it matters: Electrical interference can mimic lead failure or artifact.

Check Filter and Gain Settings

• Review device settings affecting signal display.
• Actions:
  • Verify correct filter settings (e.g., muscle filter, AC filter)
  • Adjust gain if waveform appears too small or large
• Expected: Clear, readable waveform.
• Why it matters: Incorrect settings can distort or mask the signal.

Perform System Reset (If Needed)

• Restart the device if signal issues persist.
• Actions:
  • Power cycle the unit
  • Reconnect cables and attempt acquisition again
• Expected: System resets and signal may normalize.
• Why it matters: Software glitches can affect signal processing.

If the Problem Persists

If all external causes have been ruled out and the issue continues, the problem is likely internal (input board, connector interface, or signal processing failure).

Remove the device from service, label it Out of Service, and send for repair or bench evaluation.

Knowing when to stop prevents unnecessary risk and repeated ineffective troubleshooting.

Clinical Use Tip

Do not troubleshoot signal issues while actively acquiring a diagnostic ECG on a patient. Always move the patient to a functioning device first.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"EKG showing lead fail and poor waveform quality during acquisition."

Cause

What was observed during troubleshooting.

Example:
"Worn patient cable with intermittent internal break causing signal loss."

Resolution

What action was taken.

Example:
"Replaced patient lead cable and verified proper signal acquisition on all leads."

Helpful Details to Include (If Known)

• Electrodes replaced
• Patient cable swapped
• Specific leads affected
• Presence of electrical interference
• Waveform appearance (noisy, flat, intermittent)
• Final device status (returned to service or removed)

Final Thought

Effective ECG troubleshooting starts with the patient interface—electrodes and cables—before assuming device failure. A logical, stepwise approach protects patient safety, saves time, and avoids unnecessary repairs. Proper documentation ensures traceability and supports future troubleshooting efforts.

That is successful troubleshooting.