Ortivus AB 410000409 User Manual
45
Respiration
6
6 Respiration
Respiration measurement is conducted with the bio-impedance
method. The method has the advantage of using the same electrodes
that are used to monitor ECG. The respiration rate is calculated from the
transthoracic impedance signals from either 2-wires or 4-wires.
However, the method is sensitive to all movements and activities.
The running bio-impedance curve is presented in the waveform area of
The running bio-impedance curve is presented in the waveform area of
the monitor view together with the current respiration value in breaths
per minute.
Figure 29. Respiration waveform
6.1 Measurement
The best alternative for respiration analysis is with 4-wire measurement.
4-wire measurement uses two separate pairs of electrodes in which one
pair feeds and the other pair measures, whereas 2-wire measurement
uses the same wires to feed and measure. 4-wire or 2-wire
measurement can be selected in the respiration settings menu (see
“Respiration settings” on page 47).
Important:
Respiration measurement by the impedance method must not be made
on patients with pacemakers/ICDs that use impedance measurement to
control rate-response function since it may affect the function of the
pacemaker/ICD.
The method is not reliable when the patient has obstructive apnoea or
The method is not reliable when the patient has obstructive apnoea or
weak breathing.
For reliable measurement the method requires that the patient should
For reliable measurement the method requires that the patient should
remain still.
For respiration measurement with 5 lead cable and 4-wire method, the
For respiration measurement with 5 lead cable and 4-wire method, the
C (V)-electrode should be placed close to the C4 (V4)-position.