Baxter PrismaFlex

Asset Type

Continuous Renal Replacement Therapy (CRRT)

Manufacturer

Baxter

Model

PrismaFlex

What This Guide Helps With

This guide helps troubleshoot the Baxter PrismaFlex Air in Blood alarm when air, foam, leakage, incomplete priming, or return-line installation issues affect the blood return path. This alarm can interrupt CRRT therapy and must be treated as a patient safety concern because air in the return path may create a serious risk to the patient.

Step-by-Step Troubleshooting

1. Ensure Patient Safety First

• Immediately treat the Air in Blood alarm as a patient safety issue.
• Do not bypass, silence, or ignore the alarm while the PrismaFlex is connected to a patient.
• Confirm the patient is clinically stable and that therapy is paused or managed according to the device prompts and hospital policy.
• Involve nursing or clinical staff before handling the blood path, access connection, return line, or disposable set.
• Expected: Blood return is protected, and the patient is not exposed to air in the return path.

2. Verify the Reported Alarm and Behavior

• Confirm the PrismaFlex screen displays Alarm: Air in Blood.
• Identify when the alarm occurs: during startup or priming, shortly after patient connection, during active therapy, after bag or line manipulation, after access manipulation, or intermittently during treatment.
• Look for visible air or foam in the return line, air in the deaeration chamber, frequent return-line alarms, incomplete priming, return line misplacement, leakage, or loose disposable-set connections.
• Expected: The alarm is clearly associated with visible air, foam, line installation, priming, or suspected leakage.

3. Stop and Inspect Before Continuing

• Before attempting to clear the alarm, visually inspect the disposable set and blood path.
• Check for disconnected tubing, loose luer connections, leaking access connections, cracked disposable components, air or foam in the return line, air in the deaeration chamber, and incomplete priming.
• Do not continue therapy until the source of visible air, leakage, or misinstallation has been addressed according to facility procedure.
• Expected: Any obvious leak, disconnection, or visible air source is identified before therapy continues.

4. Check the Blood Access and Disposable Set for Leaks

• Inspect the blood access connection and the entire disposable set.
• Verify access line connections are secure, return line connections are secure, tubing is not disconnected, and no fluid or blood leakage is present.
• Check for loose caps, damaged fittings, visibly open connections, or cracked disposable components.
• If a loose connection or leak is found, correct it only if safe and permitted by hospital procedure.
• Expected: The blood circuit is closed, secure, and free of leakage.

5. Verify Return Line Placement in the Air Detector

• Check that the return line is installed correctly in the PrismaFlex air detector.
• Confirm the return line is fully seated in the detector channel.
• Verify the tubing is not twisted, pinched, stretched, or partially outside the sensor path.
• Confirm the air detector door or tubing holder is properly closed and the correct section of tubing is placed in the detector.
• If the line was misinstalled, reinstall it correctly and follow the device prompts to reassess the alarm.
• Expected: The return line is correctly positioned in the air detector.

6. Inspect for Visible Air or Foam

• Inspect the return line and deaeration chamber closely.
• Look for air bubbles in the return line, foam in the tubing, air trapped in the deaeration chamber, air moving through the blood path, or air distributed throughout the disposable set.
• If air is localized in the return line or deaeration chamber, follow the on-screen process to remove the air.
• If air is widespread throughout the set, do not continue using the set for patient therapy.
• Expected: Air or foam is either absent, localized, or clearly visible.

7. Follow the On-Screen Air Removal Process

• Follow the PrismaFlex on-screen instructions exactly.
• The guided process may include obtaining negative return pressure, using RELEASE CLAMP when prompted, drawing blood into the return line or deaeration chamber, and removing visible air from the return path.
• Do not improvise around the alarm process or attempt to bypass return-line safety controls.
• Follow facility policy for any blood-path handling or therapy interruption.
• Expected: Air is removed from the return line and deaeration chamber, and the alarm clears.

8. Determine Whether the Set Was Fully Primed

• If the alarm occurred during setup, startup, or shortly after treatment began, verify whether the disposable set was fully primed.
• Check for incomplete priming, air remaining in tubing after setup, air in the deaeration chamber, foam caused by improper priming, or incorrect line installation during setup.
• If the set is not fully primed and air remains in multiple areas, do not use the set for patient therapy.
• Expected: The disposable set is fully primed with no visible air in the blood path.

9. Replace the Set if Air Is Present Throughout the Circuit

• If air is visible throughout the disposable set, press DISCONNECT and remove the device from active therapy according to the on-screen instructions and hospital policy.
• Load and prime a new disposable set before returning to therapy.
• Verify the replacement set is properly loaded, fully primed, correctly routed, and free of visible air before patient connection.
• Expected: A properly loaded and fully primed replacement set clears the air condition.

10. Confirm Alarm Resolution

• Confirm the Air in Blood alarm has cleared.
• Verify no visible air or foam remains in the return line.
• Confirm the return line is properly installed in the air detector.
• Verify all connections remain secure and no leakage is present.
• Confirm therapy resumes normally without repeated Air in Blood alarms.
• Expected: The PrismaFlex operates without recurrence of the alarm.

If the Problem Persists

If the Air in Blood alarm continues after leaks and disconnections have been ruled out, return line installation has been verified, visible air or foam has been removed, the set has been properly primed, and a new disposable set has been loaded if needed, then external and common disposable-set causes have been ruled out.

Persistent Air in Blood alarms may indicate a device-related issue such as air detector failure, sensor malfunction, or related detection circuitry failure.

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

Clinical Use Tip

Never troubleshoot an unresolved Air in Blood alarm on an active patient beyond the device-guided and facility-approved process. Move the patient to a backup device or alternate therapy support first if treatment must continue, the set must be changed, or the alarm cannot be cleared safely.

Work Order Documentation (CCR Method)

CCR = Complaint, Cause, Resolution

Complaint

What was reported by the clinical staff.

Example:
"PrismaFlex CRRT reported Air in Blood alarm during treatment. Staff observed air or foam in the return path, and therapy could not continue until the alarm was corrected."

Cause

What was observed during troubleshooting.

Example:
"Air was detected in the blood return path. External inspection found possible disposable-set air source, return-line installation issue, incomplete priming, leakage, or air/foam in tubing. If unresolved after set replacement and proper setup, likely air detector or sensor-related failure."

Resolution

What action was taken.

Example:
"Inspected blood access and disposable set for leakage or disconnection. Verified return line placement in the air detector. Checked return tubing and deaeration chamber for visible air or foam. Followed on-screen air removal process using negative return pressure and RELEASE CLAMP when prompted. If air remained throughout the set, treatment was disconnected and a new set was loaded and primed. Device returned to service only after alarm cleared and no visible air remained. If alarm persisted, device was removed from service for bench evaluation."

Helpful Details to Include (If Known)

• Alarm behavior
• Accessories swapped
• Power behavior
• Environmental factors
• Indicator lights
• Final device status

Final Thought

The Air in Blood alarm should always be treated as a patient safety issue first. Logical troubleshooting begins with the blood path, disposable set, tubing placement, visible air, and priming status before suspecting device failure. If the alarm cannot be cleared safely, removing the device from service and documenting the findings protects the patient and supports proper repair follow-up.

That is successful troubleshooting.