ACIST RXI - Hemodynamic Pressure Monitoring; Pressure Waveform Accuracy; Dampened Pressure Tracing

Hemodynamic Pressure Monitoring
84 | ACIST RXi System User’s Guide 901700-001,01 2019-09 English
Troubleshooting and Support
CAUTION
Inaccurate measurements from the hemodynamic pressure transducer may result if the
transducer is not prepared and connected correctly.
With the stopcock at the midaxillary position, zero the hemodynamic transducer at the
start of each patient case by using atmospheric pressure as a zero pressure reference.
Zeroing the transducer ensures that the pressure values measured are only from within
the blood vessel or from within the heart. Periodically re-zeroing the transducer ensures
the continued accuracy of blood pressure readings. If hemodynamic signal drift is
suspected, re-zero the transducer.
Prior to recording physiological blood pressures with the hemodynamic pressure
transducer, re-zero the transducer at the patient midaxillary position to establish a clear
baseline. (Changes in bed height, atmospheric pressure, catheter hub position, uid
density, and so on, may aect the baseline pressure.)
The blood pressure waveform may be dampened signicantly when using very
small diameter catheters lled with contrast. Perform a saline ush before recording
physiological waveforms with the transducer system.
When using an ACIST or a third-party hemodynamic transducer, clear all tubing of air to
avoid producing an inaccurate reading.
Pressure Waveform Accuracy
To ensure accurate waveforms, zero the hemodynamic transducer with
both the transducer and the stopcock at the midaxillary position. Check the
hemodynamic zero before recording any pressures.
Dampened Pressure Tracing
e waveform may be damped when the guide catheter or tubing is lled with
contrast. To obtain the clearest waveform:
• Check the entire uid pathway for air bubbles and purge the patient
tubing if necessary.
• Remove contrast from the guide catheter with a hand syringe attached
to the high-pressure stopcock and hand ush it with saline.
• Zero the hemodynamic transducer with both the transducer and the
stopcock at the midaxillary position.
• If you have signal problems, inspect both hemodynamic connectors for
presence of contaminating materials.
• Ensure that you do not wedge the guide catheter in the selected artery
or create any kink in the guide catheter. Do not adjust any kink. If you
discover a kink, do not use the guide catheter.
Hemodynamic
Pressure
Monitoring