GE ApexPro Operator's Manual page 201

NBP
Troubleshooting
NBP status messages
2001989-200E
WARNING
LOSS OF ALARMS—Do not use transmitter accessory devices
such as SpO2 and NBP without ECG cables attached. Failure to use
accessory devices in the prescribed manner may result in a loss of
alarms.
Problem: Erroneous NBP measurement
Solution:
1. Check for proper cuff size:
Too small a cuff can give an erroneously high value.
Too large a cuff can give an erroneously low value.
NOTE
For proper fit of an NBP cuff, the arm should be measured from the top of
the shoulder joint to the elbow. Divide the length by 2 and measure from the
middle of measurement on the arm. Measure the circumference in
centimeters around the arm. Refer to the NBP cuffs for proper fitting size.
2. Check for residual air left in the cuff from a previous measurement. This could
indicate a hardware problem that may require service.
3. Make sure the cuff is not too tight or too loose.
4. Make sure the cuff and the heart are at the same level; otherwise hydrostatic
pressure will offset the NBP value.
5. Watch for pulsus paradoxis.
6. Check for leak in cuff or tubing.
7. Patient may have a weak pulse.
8. Calibration may be necessary.
NBP status messages appear in abbreviated form in graph headers, when applicable.
A message will clear when the next measurement is initiated, or a message can be
cleared manually with the Clear Message option on the NBP tab sheet.
The following system status alarm messages may be displayed in the patient's bed
window during monitoring.
ApexPro™
Troubleshooting
D-7