BeneVision N1 Patient Monitor Operator’s Manual 9 - 1
9 Monitoring Impedance Respiration (Resp)
9.1 Resp Introduction
Impedance respiration is measured across the thorax. When the patient is breathing or ventilated, the volume of
air changes in the lungs, resulting in impedance changes between the electrodes. Impedance respiration rate
(RR) is calculated from the signal representing these impedance changes, and a respiration waveform is
displayed on the patient monitor screen.
Impedance respiration monitoring is intended for adult, pediatric and neonatal patients.
Respiration may also be measured using a CO
2
module. Refer to 14Monitoring Carbon Dioxide (CO
2)
for
respiration information specific to the CO
2
module.
9.2 Impedance Resp Safety Information
• When monitoring the patient’s impedance respiration, do not use ESU-proof ECG cables. The
monitor cannot measure impedance respiration with ESU-proof ECG cables.
• If you do not set the detection level for the respiration correctly in manual detection mode, it may
not be possible for the monitor to detect zero respiration rate. If you set the detection level too low,
the monitor is more likely to detect cardiac activity, and to falsely interpret cardiac activity as
respiratory activity in case of zero respiration rate.
• The respiration measurement does not recognize the cause of zero respiration rates. It only
indicates an alarm if a pre-adjusted time has elapsed without a breath being detected since the last
detected breath. Therefore, it cannot be used for diagnostic purpose.
• If operating under conditions according to the EMC Standard IEC 60601-1-2 (Radiated Immunity 3V/
m), field strengths above 3V/m may cause erroneous measurements at various frequencies.
Therefore, it is recommended to avoid the use of electrically radiating equipment in close proximity
to the impedance respiration measurement unit.
• The current used to measure impedance respiration may cause rate changes in Minute Ventilation
Rate Responsive Pacemakers. If you suspect the patient monitor is affecting the pacemaker rate
then replace the ECG cable with an ECG cable that contains ESU filters.
• Only use parts and accessories specified in this manual.
• Impedance respiration monitoring is not for use on patients while they are active, as this can cause
false alarms.
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