Impedance respiratory rate (RRi)
240 Instructions for use – Infinity Acute Care System – Monitoring Applications VG6.n
Overview of respiration monitoring
The M540 measures respiratory rate derived from
impedance measurement by passing a harmless
high-frequency current between two ECG
electrodes on the patient's chest. Electrical
resistance (impedance) between the electrodes
varies with the expansion and contraction of the
chest during inspiration and expiration. The M540
displays a respiration waveform and respiratory
rate value from these impedance changes and
relays this information to the Cockpit for display.
The M540 uses ECG leads I or II regardless of the
lead selected for 5-, 6-, and 12-lead configurations.
RRi processing is dependent on the QRS
processing lead for 3-lead configurations. RRi
works only on leads I and II.
Respiration monitoring is for adult, pediatric, and
neonatal patients. The M540 can use the
respiration signal for central apnea monitoring.
Refer to the Instructions for use Infinity Acute Care
System – Infinity M540 for a detailed description of
the M540 respiration functions. The respiration
monitoring functions are configurable in the
parameter-specific setup page (see page 248).
Before performing any monitoring functions, refer
to the section "For your safety and that of your
patients" on page 13. Parameter-specific error
messages are listed on page 523.
Supported parameter
RRi – respiratory rate measured by impedance
(RRi values are not displayed when the HfC filter is
activated – see page 214).
Respiration precautions
NOTE
RRi and 12-lead ECG monitoring are unavailable
when the M540 is in OR mode and the ECG filter
is set to Monitor.
WARNING
The safety and effectiveness of the respiration
measurement method in apnea detection,
particularly the apnea of prematurity and
apnea of infancy, has not been established.
WARNING
This device does not monitor obstructive
apnea. Patients at risk for respiratory crises
should be observed closely.
WARNING
Large amplitude pacemaker pulses (100 mV or
greater) may interfere with the monitor’s
ability to measure or detect respiration.
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