Stryker LIFEPAK CR2

ECG Analysis Will Not Start or Complete

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Asset Type

Defibrillator

Manufacturer

Stryker

Model

LIFEPAK CR2

What This Guide Helps With

Troubleshooting absent, delayed, interrupted, or incomplete ECG rhythm analysis caused by electrode contact, accessories, motion, interference, power, or device faults.

Step-by-Step Troubleshooting

1. Ensure Patient Safety First

Do not perform extended troubleshooting on a LIFEPAK CR2 that is required for an active cardiac arrest response.

If ECG analysis does not start or complete during actual patient use:

Expected: Patient care is not dependent on an AED with unresolved rhythm-analysis performance.

Why it matters: Failure to complete rhythm analysis may prevent the device from reaching an appropriate shock decision. Troubleshooting beyond immediate external corrections should occur off patient.

If another verified defibrillator restores safe emergency-response capability, remove the affected CR2 from clinical reliance and continue evaluation in a controlled setting.

2. Confirm the Exact Failure Behavior

Determine precisely what Clinical Engineering can reproduce.

Check whether:

Record all audible prompts, indicator behavior, and sequence timing.

Expected: The complaint is narrowed to an electrode-recognition, signal-quality, operating-sequence, power, or device-level problem.

If the reported behavior cannot be reproduced, continue with accessory, readiness, and controlled functional checks before returning the unit to service.

3. Verify the Correct Operating Sequence

Using an approved non-patient test method, verify that the CR2 is being activated through its normal operating sequence.

Check that:

Do not assume the device should enter rhythm analysis immediately upon power-up. Analysis depends on progression through the AED rescue sequence and acquisition of an acceptable ECG signal through the electrodes.

Expected: The CR2 powers on normally and proceeds through its expected prompt sequence.

If startup is abnormal, prompts are missing, or the sequence freezes before electrode evaluation, stop and escalate the device for bench evaluation.

4. Check Electrode Connection and Deployment

Inspect the installed QUIK-STEP electrode assembly and associated connection points externally.

Check for:

Ensure the electrode system is installed and routed as intended for the CR2.

Expected: The electrode assembly is intact, in date, correctly installed, and free of obvious physical damage.

If correcting an obvious seating or deployment problem restores the expected analysis sequence, document the finding, complete required testing, and stop.

5. Verify Electrode Pad Condition and Contact

For controlled troubleshooting, use only an approved test setup appropriate for AED evaluation. Do not test rhythm analysis on a healthy person.

If reviewing a clinical event, determine whether the pads may have had:

Expected: Both pads can provide stable contact through an approved simulator/test arrangement or were documented as properly applied during the event.

Why it matters: The CR2 obtains ECG information through its therapy electrodes. Poor contact can prevent dependable signal acquisition and interfere with analysis.

If a known-good compatible electrode set resolves the problem during approved testing, replace the defective or suspect electrode assembly and complete post-service verification.

6. Substitute a Known-Good Compatible Electrode Set

When permitted by facility procedure and manufacturer requirements, repeat the controlled test with a known-good, in-date, compatible electrode set.

Do not use visibly damaged, expired, previously deployed, or questionable electrodes for comparison.

Expected: The device progresses into and completes the expected analysis sequence with the known-good electrode set.

If the problem disappears, the original electrode assembly is the likely cause.

Remove the suspect electrodes from service, replace them, document the failure, and complete the required readiness check.

7. Eliminate Motion and Mechanical Disturbance

During controlled analysis testing:

When reviewing an actual event, consider:

Expected: Analysis completes when the ECG input and test setup are stable.

If analysis succeeds only when movement stops, document motion or unstable contact as the likely contributor rather than assuming an internal AED failure.

8. Check for Electrical or Electromagnetic Interference

Move the CR2 and approved test setup away from potential high-interference sources when practical.

Consider nearby:

Repeat the controlled test in a different location.

Expected: Analysis performance remains stable regardless of location.

If the problem occurs only near a specific interference source and clears elsewhere, document the environmental relationship and investigate the source before condemning the AED.

9. Verify Battery and Power Stability

Inspect the LIFEPAK CR2 battery externally.

Check for:

Reseat the battery only when permitted by facility procedure and with the device removed from patient use.

Expected: The CR2 remains continuously powered through startup, prompts, ECG acquisition, and analysis testing.

If power instability is present, address the battery/power complaint before evaluating analysis performance further.

10. Review Readiness and Self-Monitoring Status

Check the CR2 readiness indication and any available device-management status information used by the facility.

Look for:

Connected CR2 deployments may also provide readiness information through the facility’s configured AED management workflow.

Expected: The unit indicates ready status with no unresolved battery, electrode, or device fault.

If the AED is not ready or reports a persistent fault, remove it from service and escalate rather than attempting repeated patient-use simulations.

11. Test With an Approved AED/ECG Simulator

Use a manufacturer-compatible or facility-approved AED analyzer/simulator according to Clinical Engineering procedure.

Verify whether the LIFEPAK CR2:

Use only approved test equipment and established procedures. Do not improvise a live-person test.

Expected: The device consistently completes analysis and responds appropriately to the controlled simulated rhythm.

If analysis repeatedly fails with a known-good electrode setup and approved simulator, the likelihood of an internal device fault increases.

12. Repeat the Test for Intermittent Failure

If the first controlled test passes, repeat the sequence enough times to evaluate the reported intermittent behavior.

Observe for:

Expected: Analysis starts and completes consistently across repeated controlled tests.

If failure is intermittent but reproducible, remove the unit from service. An intermittent AED analysis problem should not be returned to service solely because one test passed.

13. Inspect for External Physical Damage

Inspect the CR2 externally for:

Do not open the enclosure unless specifically authorized, trained, and following approved service documentation.

Expected: No external condition suggests compromised reliability.

If impact, fluid intrusion, overheating, or significant damage is found, stop troubleshooting and escalate for repair evaluation.

14. Determine Whether the Failure Is Accessory-Related or Device-Related

Review the results of all controlled substitutions and observations.

Accessory-related failure is more likely when:

Device-related failure is more likely when:

Expected: The fault is isolated as far as possible without unnecessary internal disassembly.

If the issue is resolved externally, complete all required post-service testing and stop.

If the Problem Persists

If ECG analysis still will not start or complete after verifying:

then common external causes have been reasonably ruled out and the problem is likely internal or requires manufacturer-level evaluation.

The device should be:

Possible internal categories may include ECG acquisition circuitry, electrode detection, internal connections, processing, software, or other device-level faults. Do not continue into board-level troubleshooting without authorized service documentation, appropriate training, and required test equipment.

Knowing when to stop is proper troubleshooting. A defibrillator with unresolved rhythm-analysis performance should not be returned to clinical service based on an intermittent pass or inability to reproduce the failure once.

Clinical Use Tip

Never perform extended troubleshooting on an active cardiac-arrest patient.

If the LIFEPAK CR2 cannot reliably begin or complete analysis:

Clinical Engineering testing should be performed off patient using approved simulation equipment.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"Clinical staff reported the LIFEPAK CR2 powered on and delivered voice prompts but would not complete ECG rhythm analysis during use."

Cause

What was observed during troubleshooting.

Example:
"Clinical Engineering reproduced intermittent analysis failure with the original electrode assembly; analysis completed normally after installation of a known-good compatible electrode set."

Resolution

What action was taken.

Example:
"Replaced the suspect electrode assembly, verified repeated analysis sequences using an approved AED simulator, confirmed ready status, and returned the device to service."

Helpful Details to Include (If Known)

Final Thought

ECG analysis failure on an AED demands disciplined troubleshooting: protect the patient first, verify electrodes and signal conditions, eliminate external causes, test with approved equipment, and escalate when reliability remains uncertain. Clear CCR documentation preserves what failed, what was proven, and why the final disposition was appropriate.

That is successful troubleshooting.

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