GE HEALTHCARE B20, Руководство пользователя

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Impedance respiration
12-1
12 Impedance respiration
Safety precautions
Warnings
•
Make sure that the leadwire set clips or snaps do not touch any electrically conductive
material including earth.
•
The monitor may not detect all episodes of inadequate breathing, nor does it distinguish
between central, obstructive and mixed apnea events.
•
ELECTRODE CONFIGURATION - Impedance respiration monitoring is not reliable when
ECG electrodes are placed on the limbs.
•
This device is not an apnea monitor system intended to alarm primarily upon the
cessation of breathing. In central apnea it indicates an alarm after a pre-determined time
since the last breath detection. Do not attempt to use it for detecting obstructive or mixed
apneas, since respiration movements and impedance variations may continue in these
cases.
•
The impedance respiration measurement is inherently very sensitive as it measures very
small physiologic signals (changes of impedance of the patient's chest area). Conducted
RF current above 1 Vrms may cause erroneous measurements at various frequencies, for
example interference with the signal/waveform leads to respiration rate readings
inconsistent with the patient's true respiration rate. If you notice this, use another form of
respiration monitoring, for instance the E-miniC module.
•
Electrical interference - Electrical devices, such as electrosurgery units and infrared
heaters, that emit electromagnetic disturbance may cause artifacts or disable the
respiration measurement completely.
•
Movement artifacts - Changing position, moving the head, moving the arms or shivering
may result in movement artifacts. Also the heart may cause noticeable movement and
sometimes this may interfere with the respiration measurement.
•
Intermittent mechanical ventilation - During spontaneous breathing the ventilator may at
times support the patient’s ventilation with an extra inspiration. If these ventilator
inspirations are substantially larger than the spontaneous breaths, the respiration
calculation may mistakenly count only the inspirations and expirations produced by the
ventilator.
•
The impedance respiration measurement may cause rate changes in Minute Ventilation
Rate Responsive Pacemakers. Set the pacemaker rate responsive mode off or turn off the
impedance respiration measurement on the monitor.
•
APNEA alarm - If you deactivate the Apnea alarm, keep the patient under close
surveillance.
Cautions
•
When using the electrosurgery unit, ensure proper contact of the ESU return electrode to
the patient to avoid burns at measurement sites. Also ensure that the ESU return
electrode is near the operating area.