Resp Menu Respiration Monitoring
5 - 4 0070- 0-0704-02 Passport V Operating Instructions
5.3.1 Thoracic Impedance
The Passport V monitor presents a small electrical signal across the RA and LA ECG limb
leads. This signal changes as the patient’s chest wall rises and falls during the breath cycle.
The advantage of the thoracic impedance method is that respiration is obtained non-
invasively. It is important to use cables with internal resistors for thoracic impedance.
ECG ESIS choke block cables have electrical filters that may be used in electro-cautery
environments where ECG interference can be substantial. These filters remove the electro-
cautery noise, but also block the signal used by the Passport V monitor to measure
respiration.
The filling and emptying of the heart chambers can interfere with the thoracic impedance
signal, so called cardiovascular artifact (CVA), such that the respiratory signal matches the
heart rate. The Passport V warns the operator when the respiration value equals the heart
rate by displaying “CVA”.
If the patient’s airway is obstructed and the patient attempts to breath, then the chest wall can
move and create a respiratory signal even though no gas flow is occurring in the patient.
CAUTION: Some pacemakers may contain a respiratory sensor that
may produce artifact on an ECG waveform.
Size 1
2
3 (default)
4
5
Select to change respiration size.
After the wave Size is changed, the current wave is
displayed at the selected size.
Speed
3.125 mm/s
6.25 mm/s (default)
12.5 mm/s
25 mm/s
Select to change respiration trace speed.
After the wave speed is changed, the waveform area
is refreshed and the wave sweeps at the selected
speed.
Apnea Alarm On (default)
Off
Select to turn respiration apnea alarm on or off.
Off: Apnea Alarm will not be activated.
On: Apnea Alarm will be activated when the delay
time is equal to or exceeded.
Note: This setting is only valid for the Resp module.
If Patient Size = Neonate, the Apnea Alarm is always
on and cannot be changed by the user.
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