GE HEALTHCARE B20, User'S Reference Manual

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Invasive blood pressure
15-1
15 Invasive blood pressure
Safety precautions
Warnings
•
All invasive procedures involve risks to the patient. Use aseptic technique. Follow catheter
manufacturer's instructions.
•
Make sure that no part of the patient connections touches any electrically conductive
material including earth.
•
Mechanical shock to the invasive blood pressure transducer may cause severe shifts in
zero balance and calibration, and cause erroneous readings.
•
When initializing the IBP parameter, Invasive blood pressure alarm activation criteria may
result in inactive limit alarms.
•
When using the electrosurgery unit, ensure proper contact of the ESU return electrode to
the patient to avoid possible burns at monitor measurement sites. Also ensure that the
ESU return electrode is near the operating area.
Overview
You can measure and monitor two invasive blood pressures at the same time using a dual
invasive blood pressure cable. To measure invasive blood pressure you need the IBP
configuration in monitor.
To measure invasive blood pressure, a catheter is inserted into an artery or vein. The invasive
blood pressure setup, consisting of connecting tubing, a pressure transducer, and a fluid
source to maintain pressure (all connected together by stopcocks) is attached to the catheter.
The transducer is placed at the same level with the heart, and is electrically zeroed. The
transducer is a piezo-resistive device that converts the pressure signal to a voltage. The
monitor interprets the voltage signal so that pressure data and pressure waveforms can be
displayed.
The measured invasive blood pressure parameters are systolic, diastolic, and mean. Pulse rate
can be monitored with any arterial site. CPP is a calculated value that requires a valid ICP value
and a valid arterial site value. 2 channel pressures can be monitored.
During the invasive blood pressure measurement, the transducer converts pressure variations
into electrical signals. The electrical signals are amplified and displayed as numeric pressure
values and waveforms.