Philips IntelliVue MP5 User Manual

185
15
15Monitoring Carbon Dioxide
Use the CO
2
measurement to monitor the patient’s respiratory status and to control patient
ventilation.
There are two methods for measuring carbon dioxide in the patient’s airway:
• Mainstream measurement uses a CO
2
sensor attached to an airway adapter directly inserted into the
patient’s breathing system.
• Sidestream measurement takes a sample of the respiratory gas with a constant sample flow from the
patient’s airway and analyzes it with a remote CO
2
sensor. Two variations of this method, with
different sensors, are available as options on the monitor. They are referred to here as sidestream
CO
2
and Microstream CO
2
.
In both cases, the measurement principle is infrared transmission, where the intensity of infrared light
passing the respiratory gas is measured with a photo detector. As some of the infrared light is absorbed
by the CO
2
molecules, the amount of light passing the gas probe depends on the concentration of the
measured CO
2
.
When using a wet ventilator circuit, monitor mainstream CO
2
if available, in preference to sidestream
CO
2
.
The partial pressure is calculated from the gas concentration by multiplying the concentration value
with the ambient pressure.
The measurement provides:
•a CO
2
waveform.
• an end tidal CO
2
(etCO
2
) value: the CO
2
value measured at the end of the expiration phase.
• an inspired minimum CO
2
(imCO
2
): the smallest value measured during inspiration.
• an airway respiration rate (awRR): the number of breaths per minute, calculated from the CO
2
waveform.
Depending on the Max Hold setting configured for your monitor, the etCO
2
numeric shows either
the highest CO
2
value measured within the configured time period (Max Hold set to 10 sec or
20 sec) or the etCO
2
numeric shows breath-to-breath value (Max Hold set to Off).
WARNING Correlation: The etCO
2
readings do not always correlate closely with paCO
2
, especially in neonatal
patients and patients with pulmonary disease, pulmonary embolism or inappropriate ventilation.
Pharmaceuticals in aerosols: Do not measure CO
2
in the presence of pharmaceuticals in aerosols.

Philips IntelliVue MP5 Specifications

General

Brand	Philips
Model	IntelliVue MP5
Category	Medical Equipment
Language	English