ACIST | CVi® System User's Guide 901418-003,01 2019-08 English (USA) | 71
Troubleshooting Hemodynamic Issues8 Troubleshooting
Zero Fluctuations
• Was zero set up at midaxillary?
ӽ An elevation dierence between the transducer and stopcock can cause
an oset of 7 mmHg to 10 mmHg (0.9 kPa to 1.3 kPa).
ӽ Zero with saline in the patient tubing, the stopcock open to air, and the
stopcock and transducer located at midaxillary.
• Did the zero change aer a large injection?
ӽ Aer a large injection, use a hand syringe lled with saline to ush
contrast from the patient catheter. en re-zero the transducer.
ӽ Re-zero the transducer before performing critical measurements.
ӽ Be sure to zero at midaxillary.
• Did the zero change aer a saline ush?
ӽ An elevation dierence between the transducer and stopcock can cause
an oset of 7 mmHg to 10 mmHg (0.9 kPa to 1.3 kPa).
ӽ Zero with saline in the patient tubing, the stopcock open to air, and the
stopcock and transducer located at midaxillary.
ӽ Ensure that there is saline and/or contrast in the patient tubing.
ӽ Manually ush the patient catheter with a hand syringe and re-zero the
transducer when performing critical measurements.
• If a second transducer was added aer the initial zero, re-zero the
transducer. Ensure that the stopcock is open to air, and that the stopcock
and transducer are located at midaxillary.
• Check the transducer for damage or dislodgement. If the transducer needs
to be replaced, disconnect from the patient, replace the manifold/transducer
kit, remove all air from the system, and resume the case.
• Check the transducer backplate:
ӽ e backplate is rated for 500 cases.
ӽ Make sure that the transducer is seated properly on the backplate.
ӽ Check the backplate connector.
ӽ Replace the backplate if it is worn out, cracked, or damaged. When
inspecting the backplate, pay special attention to the condition of the
membrane and to the rails that hold the transducer in place.
Troubleshooting
Hemodynamic
Issues
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