GE Healthcare CARESCAPE Canvas

Invasive Pressure Channel Missing, Drifting, or Will Not Zero

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Asset Type

Patient Monitor

Manufacturer

GE Healthcare

Model

CARESCAPE Canvas

What This Guide Helps With

Troubleshooting missing, unstable, inaccurate, or non-zeroing invasive pressure channels caused by transducers, cables, connections, setup, positioning, or module communication.

Step-by-Step Troubleshooting

1. Ensure Patient Safety First

Do not perform extended troubleshooting while the CARESCAPE Canvas is the only monitor supporting an actively monitored patient.

If invasive pressure monitoring is clinically required:

Expected outcome: Patient care continues without relying on an unavailable or questionable invasive pressure channel.

Continue Clinical Engineering troubleshooting only after the monitor is no longer required for active patient care.

2. Confirm the Exact Failure

Determine whether the issue involves:

Document any messages, alarm behavior, channel labels, and whether the issue follows a specific accessory.

Expected outcome: The failure is clearly defined before parts are exchanged.

3. Verify the Required Monitoring Hardware Is Present

Confirm that the appropriate invasive pressure-capable parameter hardware is connected, powered, and recognized by the CARESCAPE Canvas system.

Inspect the parameter module, acquisition device, or connected monitoring component for:

Reseat externally removable modules or acquisition components only when the device is safely out of patient use.

Expected outcome: The required invasive pressure hardware is detected and available.

If the channel returns after reseating, perform a functional verification and stop.

4. Inspect the Pressure Cable and Transducer Connections

Trace the entire connection path from the monitor or parameter module to the reusable pressure cable and disposable transducer.

Check for:

Disconnect and reconnect each accessible connection securely.

Expected outcome: All components are fully seated, clean, dry, undamaged, and compatible.

If the channel appears and remains stable, verify operation and stop.

5. Substitute Known-Good Accessories

Replace the suspected disposable transducer with a compatible known-good transducer.

If the problem remains, substitute a known-good reusable invasive pressure cable approved for the monitoring configuration.

Change one component at a time so the failed accessory can be identified.

Expected outcome: The channel operates normally with known-good accessories.

If the issue follows the original transducer or cable, remove that accessory from use and stop after confirming normal operation.

6. Inspect the Fluid Path and Stopcock Position

Have qualified clinical personnel verify that the pressure-monitoring setup is properly prepared.

Check externally for:

Clinical Engineering should not manipulate an active patient line unless authorized and trained under facility policy.

Expected outcome: The transducer can be safely exposed to atmosphere for zeroing, and the fluid path is free of obvious external problems.

7. Verify Transducer Position and Stability

Confirm that the transducer is:

Changing the transducer height after zeroing can create an apparent pressure offset or drift.

Expected outcome: The transducer remains stable at the correct reference level.

If repositioning corrects the reading, repeat zeroing and stop after verification.

8. Attempt a Proper Zero

With the device removed from active patient use, have qualified personnel:

Compatible CARESCAPE monitoring workflows may also provide a Zero All Pressures function for connected transducers.

Expected outcome: The monitor confirms a successful zero without displaying an error.

If zeroing succeeds and the value remains stable, perform a simulated-pressure test and stop.

9. Verify the Correct Channel and Pressure Label

Confirm that the connected pressure input is assigned to the intended parameter, such as:

Check that the channel has not been disabled, hidden from the current screen layout, or assigned to an unexpected label.

Review only normal user-accessible configuration settings. Do not change protected clinical configuration values without authorization.

Expected outcome: The correct pressure channel is enabled, labeled, and displayed.

10. Check for Duplicate or Conflicting Pressure Inputs

Disconnect other unused pressure transducers and reconnect only the suspected channel.

Confirm that two pressure inputs are not:

Expected outcome: The intended physical input corresponds to the expected displayed pressure channel.

11. Compare Another Pressure Input

When another compatible invasive pressure input is available, connect the known-good cable and simulator to that input.

Observe whether the failure:

Expected outcome: The test isolates the issue to an accessory, input channel, module, or system-level communication problem.

12. Test With a Patient Simulator

Connect a compatible pressure simulator using approved test accessories.

Verify:

Do not return the monitor to service based only on a successful zero. Verify pressure accuracy at multiple simulated values according to facility procedure.

Expected outcome: The invasive pressure channel displays stable and accurate simulated pressures.

If the device passes, document the accessory or setup cause and return it to service according to facility policy.

13. Restart and Recheck Module Recognition

If all external accessories pass but the pressure channel remains missing or unavailable:

Do not repeatedly power-cycle a device displaying persistent software, module, or communication faults.

Expected outcome: The system restarts normally and the pressure channel becomes available.

If the issue returns, remove the device from service.

If the Problem Persists

If the invasive pressure channel remains missing, drifts with a stable simulator, or will not zero after known-good accessories and correct setup have been verified, common external causes have been ruled out.

The failure may involve the pressure input circuitry, parameter module, acquisition device, connector assembly, software configuration, or system communication.

The device should be:

Do not return the monitor to clinical use with an unstable or unverified invasive pressure channel. Knowing when to stop and escalate is proper troubleshooting.

Clinical Use Tip

Never troubleshoot an unreliable invasive pressure channel while it is the only source of hemodynamic information for an active patient. Move monitoring to another verified device first, then evaluate the monitor under controlled conditions.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"Clinical staff reported that the CARESCAPE Canvas arterial pressure channel would not zero and displayed a drifting value."

Cause

What was observed during troubleshooting.

Example:
"Testing found an intermittent reusable invasive pressure cable that produced unstable simulated pressure readings when the cable was moved."

Resolution

What action was taken.

Example:
"Replaced the defective pressure cable, successfully zeroed the channel, and verified stable pressure accuracy with a simulator before returning the monitor to service."

Helpful Details to Include (If Known)

Final Thought

Patient safety comes first whenever an invasive pressure value is missing or questionable. A logical evaluation should isolate accessories, setup, positioning, configuration, and input-channel problems before internal failure is suspected. Accurate CCR documentation preserves the troubleshooting evidence and supports appropriate repair escalation.

That is successful troubleshooting.

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