Datascope Passport - Mindray

Operation Respiration Monitoring
3.16 Respiration Monitoring
3.16.1 Resp Menu
The Passport 2 Monitor offers two kinds of respiratory monitoring: Thoracic impedance
and CO2 (optional). Both methods offer certain benefits and limitations. A respiration source
may be selected. The choices are Auto, CO2 or ECG. When the Respiration source is set to
AUTO, the unit will search for a source in the following order: CO2 waveform from the
optional Gas Module or from the optional Microstream ® CO2 (depending on settings in the
Installation Menu), then ECG. The Passport 2 LT monitor offers Thoracic impedance
respiratory monitoring. When the respiration source is ECG, either Lead I or Lead II may be
selected. Lead II is the default.
NOTE: When 12 Lead ECG is enabled, Respirations can be acquired
from the 3 Lead or 5 Lead ECG cables as well as CO 2.
CAUTION: Some pacemakers may contain a respiratory sensor that
may produce artifact on an ECG waveform.
FIGURE 3-23 Resp Menu
3.16.2 Thoracic Impedance
The Passport 2/Passport 2 LT Monitor presents a small electrical signal across the RA
and LA (or RA & LL) 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 and without any extra cost. It is important to use cables
with internal resistors for Thoracic Impedance, see Section 5.1.7 for a list of cables.
CAUTION: Thoracic impedance monitoring may affect rate responsive
pacemakers.
Choke blocks are 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 2/Passport 2 LT Monitor to measure respiration.
Passport 2 ® /Passport 2 LT Operating Instructions 0070-10-0649-01 3 - 53