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What This Guide Helps With
This guide assists Clinical Engineering in troubleshooting DASH 5000 monitors when invasive arterial or central venous pressure readings drift, fail to calibrate, or show inconsistent values. Symptoms include slow baseline drift, sudden spikes, or readings that do not correlate with a reference transducer. The guide focuses on external and easily verifiable causes before assuming internal device failure.
Step-by-Step Troubleshooting
Ensure Patient Safety First
- Never troubleshoot invasive pressure while the patient is actively connected.
- Move the patient to another functioning monitor before performing calibration or transducer adjustments.
- Confirm patient stability before manipulating the monitoring system.
Verify Zeroing and Calibration Procedure
- Confirm the monitor has been zeroed per the standard procedure.
- Reason: Improper zeroing is a common cause of baseline drift or inaccurate readings.
Check Transducer Position and Level
- Ensure the transducer is at the correct phlebostatic axis (mid-axillary line, 4th intercostal space).
- Verify the leveling of the transducer relative to the patient’s heart.
- Reason: Incorrect leveling can cause offset errors or drifting readings.
Inspect Pressure Tubing and Connections
- Look for kinks, air bubbles, or loose connections in the tubing.
- Flush the line with saline if necessary to remove microbubbles.
- Reason: Air or fluid column inconsistencies can mimic calibration drift.
Verify Transducer Integrity
- Check for expiration date or manufacturer-recommended service interval.
- Inspect for visible damage or leakage.
- Swap with a known-good transducer if available.
- Reason: A faulty transducer can introduce drift or erratic readings.
Check Monitor Configuration and Settings
- Confirm the correct pressure type is selected (ART, CVP, PA).
- Verify alarm limits and calibration parameters match clinical setup.
- Reason: Incorrect configuration may trigger false drift alerts or misinterpret signals.
Assess Electrical and Environmental Factors
- Ensure the monitor is on a stable power source; battery-only operation can occasionally affect calibration.
- Check for nearby devices causing electrical interference.
Perform a Known-Reference Test
- If possible, connect the monitor to a calibrated pressure simulator to verify reading accuracy.
- Reason: Confirms whether drift originates from the monitor or the patient setup.
If the Problem Persists
If baseline drift or calibration issues continue after all external checks:
- Remove the monitor from patient care.
- Label as Out of Service.
- Send for bench evaluation or vendor repair.
Remember: Proper troubleshooting includes knowing when to escalate.
Clinical Use Tip
- Never troubleshoot invasive pressure while the patient is actively connected.
- Move the patient to another functioning monitor before performing any calibration or replacement of transducers.
- Always confirm patient stability before manipulating the monitoring system.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
“Invasive pressure readings drifting and failing calibration during patient monitoring.”
Cause
What was observed during troubleshooting.
Example:
Observed baseline drift despite zeroing; tubing had microbubbles, transducer not properly leveled.
Resolution
What action was taken.
Example:
Flushed line, leveled transducer correctly, replaced with a known-good transducer; monitor calibrated successfully.
If issue persists, monitor removed from service for bench evaluation.
Helpful Details to Include
- Outlet tested and verified stable
- Tubing inspected and flushed
- Transducer swapped and checked
- Monitor calibration logs reviewed
- Alarm behavior during drift events
- Baseline stability after adjustments
Final Thought
Clinical troubleshooting of invasive pressure should prioritize patient safety, start with simple external checks, and escalate appropriately when internal failure is suspected. Accurate documentation ensures continuity of care and supports maintenance tracking.
That is successful troubleshooting.