Stryker LIFEPAK CR2

Excessive Motion or CPR Interferes With Analysis

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Asset Type

Defibrillator

Manufacturer

Stryker

Model

LIFEPAK CR2

What This Guide Helps With

Troubleshooting repeated motion prompts, delayed rhythm analysis, or apparent CPR interference caused by movement, electrode contact, transport, configuration, or device faults.

Step-by-Step Troubleshooting

1. Ensure Patient Safety First

Do not perform extended troubleshooting during an active resuscitation event.

During actual use, follow the LIFEPAK CR2 voice prompts, keep rescuers clear when instructed, and remove avoidable motion sources without delaying appropriate patient care.

Expected: Patient care remains the priority, and troubleshooting is deferred until the device can be evaluated safely.

Why it matters: Stryker states that the LIFEPAK CR2 motion-detection function can identify motion from CPR, rescuer movement, patient movement, or vehicle movement. Detected motion can inhibit ECG analysis and trigger a voice prompt.

If the immediate clinical event is resolved, continue troubleshooting only in a controlled Clinical Engineering setting.

2. Confirm the Exact Reported Behavior

Interview staff and determine whether the complaint involved:

Review available event information according to facility policy when appropriate.

Expected: The complaint is narrowed to expected motion detection, an application-related problem, or a reproducible abnormal condition.

Why it matters: A motion prompt during actual movement is not automatically evidence of AED failure. Stryker specifically identifies CPR, rescuer movement, patient movement, and vehicle movement as possible motion sources.

If the reported behavior clearly matches unavoidable movement during the event and the unit otherwise operated normally, document the finding and stop.

3. Inspect the AED Before Testing

Remove the device from clinical availability for controlled evaluation.

Check for:

Expected: The AED is externally intact and shows no obvious condition that could compromise safe operation.

If physical damage, fluid intrusion, abnormal heat, or burning odor is found, stop testing, label the device Out of Service, and escalate for repair evaluation.

4. Verify Electrode Package and Connection Condition

Inspect the installed LIFEPAK CR2 electrode assembly and accessible connection path.

Check for:

Expected: Electrodes and their external connection are intact, in date, and properly connected.

Why it matters: The CR2 analyzes ECG through the applied electrode system. Poor contact or unstable pad adhesion can contribute to a noisy or unreliable signal and should be excluded before suspecting an internal analysis fault.

If replacing a questionable electrode set with an approved, compatible known-good set resolves the issue during controlled testing, restore the device only after required functional checks and stop.

5. Review Patient Motion and Rescuer Contact

Determine whether motion occurred during the analysis period.

Possible sources include:

Expected: Any motion source is identified and correlated with the reported analysis interruption.

Stryker states that when motion exceeds the system threshold, ECG analysis may be inhibited and the operator is advised by a voice prompt. The manufacturer also notes that motion can introduce ECG artifact.

If the complaint occurred only while substantial movement was present and cannot be reproduced under stable conditions, document this as the likely cause and stop.

6. Distinguish Standard Analysis From cprINSIGHT Operation

Determine the device configuration and whether the complaint is consistent with the expected analysis mode.

On applicable LIFEPAK CR2 configurations, cprINSIGHT Analysis Technology is designed to analyze ECG rhythm while CPR is being performed. Stryker states that this feature can be configured on or off in advance and is intended to reduce pauses in compressions.

Expected: Clinical Engineering confirms whether the observed behavior matches the configured analysis method.

Why it matters: “CPR interferes with analysis” may reflect a misunderstanding of the AED’s configuration or sequence rather than a hardware defect.

Do not change clinical configuration casually. Verify facility-approved settings and configuration-control requirements before making any change.

If the configuration explains the reported behavior and controlled testing is normal, document the finding and stop.

7. Verify Whether Motion Detection Is Configured as Expected

Using the facility-approved configuration workflow, confirm whether motion detection is configured as intended.

Stryker documents motion detection as a configurable function on applicable CR2 configurations.

Compare the current setting with:

Expected: The device configuration matches the organization’s approved setup.

Do not alter settings simply to suppress a reported prompt. Any configuration change should follow facility authorization and post-change verification requirements.

If an unauthorized or incorrect configuration is found and correction resolves the complaint, document the change, complete required verification, and stop.

8. Reproduce the Complaint Under Stable Bench Conditions

Using only approved test equipment and the organization’s authorized AED inspection process, evaluate the device in a stable environment.

Ensure:

Expected: Analysis proceeds without repeated unexplained motion indications under a motion-free controlled condition.

Why it matters: This separates expected motion response from a possible persistent sensing, electrode-path, or internal device problem.

If the issue cannot be reproduced and all checks pass, document the controlled result and stop.

9. Compare With a Known-Good Test Setup

If repeated motion behavior persists, isolate external test variables one at a time.

Where authorized and compatible, compare using:

Change only one variable at a time.

Expected: The failure follows either an external accessory/setup component or the suspect AED.

If the problem follows an external component, replace or correct that component, repeat required testing, and stop when successful.

10. Check for Environmental Interference

Move testing away from potential sources of vibration or electrical interference.

Examples include:

Expected: The AED behaves consistently in a stable environment.

If relocating the test setup resolves the problem, document the environmental cause and stop.

11. Perform the Approved Functional Verification

After external causes are addressed, complete the facility-approved functional inspection appropriate to the LIFEPAK CR2.

Verify, as applicable:

Do not perform unapproved live shock testing or improvised patient simulation.

Expected: The AED completes required functional verification without unexplained repeated motion detection or analysis failure.

If the unit passes and the original complaint cannot be reproduced, return it to service only according to facility policy and document the findings.

12. Stop if Unexplained Analysis Interference Persists

If repeated motion detection or analysis interruption continues when:

do not assume normal operation.

Expected: The device remains removed from service pending further evaluation.

Persistent unexplained motion recognition may indicate a fault requiring authorized bench evaluation rather than further external troubleshooting.

If the Problem Persists

If common external causes have been ruled out and the LIFEPAK CR2 continues to report motion or fails to analyze reliably under stable controlled conditions, the issue is likely beyond routine external troubleshooting.

The device should be:

Do not continue repeated field testing on a defibrillator with questionable rhythm-analysis reliability. Knowing when to stop is proper troubleshooting.

Clinical Use Tip

Do not troubleshoot analysis behavior during an active cardiac arrest beyond following the AED prompts and removing avoidable motion when safe.

Patient care comes first. During actual use, rescuers should follow the device prompts, clear the patient when instructed, and avoid unnecessary contact or movement during required analysis periods.

The LIFEPAK CR2 may also use cprINSIGHT technology on applicable configurations to analyze rhythm during CPR, so Clinical Engineering should verify the specific device configuration before labeling CPR-related behavior as a fault.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"Clinical staff reported the LIFEPAK CR2 repeatedly issued a motion-related prompt and delayed rhythm analysis during CPR."

Cause

What was observed during troubleshooting.

Example:
"Controlled testing found the AED analyzed normally when stationary; event review indicated continued patient and stretcher movement during the reported analysis period."

Resolution

What action was taken.

Example:
"Inspected electrodes and external connections, verified approved device configuration, completed controlled functional testing successfully, and returned the AED to service."

Helpful Details to Include (If Known)

Final Thought

Motion-related analysis behavior should be evaluated logically before condemning the LIFEPAK CR2. Protect the patient first, distinguish expected motion detection from abnormal behavior, verify electrodes and configuration, reproduce the complaint under stable conditions, and escalate any persistent unexplained analysis problem. Clear CCR documentation preserves both patient-safety findings and the technical reasoning behind the final disposition.

That is successful troubleshooting.

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