GE HEALTHCARE B20, Руководство пользователя

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Invasive blood pressure
15-5
Zeroing invasive blood pressure transducers
Prior to monitoring, zero transducers at the patient’s phlebostatic axis. Zeroing the pressure
transducers is very important for accurate pressure measurements. To avoid inaccurate
measurements, you must zero the pressure transducers:
•
Before measuring invasive blood pressures.
•
Before initiating treatment changes reliant upon pressures data.
•
When using a new transducer or tubing.
•
After reconnecting the transducer cable to the acquisition device.
•
Whenever the patient’s position is changed.
•
Whenever the pressure reading is questionable.
Starting with accurate values
Pressure transducers generally produce a small signal even when no pressure is applied to
them. It is necessary to zero the monitor with the transducer to establish an accurate electrical
zero point.
Also, the position of the transducer effects the accuracy of the measurement. An error of 10
mmHg of static pressure is introduced for every 13.6 cm (5.4 inches) difference in height
between the mid-heart and the transducer.
To zero the transducer, open the transducer to air and do one of the following:
•
Press the
IBP Zero All
key. This starts zeroing immediately.
Or:
•
Press the
IBP
key on the Command Board and select Zero Pressures .
During the zeroing process, the message ‘Zeroing’ is displayed. After the transducer is zeroed,
the message ‘Zeroed’ is displayed in the digit field. After each channel is zeroed, the time of
zeroing is displayed in the menu.
NOTES:
•
Selecting Zero ALL does not zero ICP. Zero it separately.
•
Check zero level after power interruptions.
IBP