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Chapter 8 Monitoring Respiraon (RESP)
8.1 Introducon
Respiraon is monitored by measuring the impedance across the thorax via electrodes places on chest. When the paent
is breathing or venlated, the volume of air changes in the lungs, resulng in impedance changes between the electrodes.
The device applies safe high-frequency current through ECG electrodes into body and measures the change of voltage
between the electrodes to reect the thoracic impedance while ECG monitoring is not aected. Respiraon rate (RR) is
calculated from these impedance changes, and the respiraon waveform is displayed on the monitor screen.
8.2 Safety Informaon
When monitoring the paent’s respiraon, it is recommended to use the so-called “non-OR” ECG cable which has
no built-in resistors to prevent the energy loss of debrillator discharge. Otherwise the performance of respiraon
monitoring is degraded.
The respiraon measurement does not recognize the cause of apneas. It only indicates an alarm if no breath
is detected when a preset me has elapsed since the last detected breath. Therefore, it cannot be used for
diagnosc purpose.
If operang under condions according to the EMC Standard EN 60601-1-2 (Radiated Immunity 3V/m), eld
strengths above 1V/m may cause erroneous measurements at various frequencies. Therefore it is recommended
to avoid the use of electrically radiang equipment in close proximity to the respiraon measurement unit.
8.3 Understanding the RESP Display
RESP waveform:
Respiraon Panel:
“RR”: the label of Respiraon. “rpm” is the unit of the Respiraon Rate (respiraon per minute). The big font “16”
is the value of Respiraon rate.
“ ”: Breath symbol. The blinking frequency is the same as the Respiraon Rate.
8.4 Changing RESP Sengs
See Secon 5.7 for details.
Label and unit
of respiraon
Segno di Sincronizzazione
della Respirazione
Respiraon rate
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