Philips MP2 User Manual

14 Monitoring Carbon Dioxide
204
Low etCO2 values: Leakages in the breathing system or sampling system may cause the displayed
etCO
2
values to be significantly too low. Always connect all components securely and check for leaks
according to standard clinical procedures. Displacement of the nasal or combined nasal oral cannulas
can cause lower than actual etCO
2
readings. Even with combined nasal oral cannulas, the etCO
2
readings may be slightly lower than actual in patients breathing through the mouth only.
Measurement Principles
For both mainstream and sidestream measurements, 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).
The Microstream method also provides an Integrated Pulmonary Index (IPI) numeric, which is an
indication of the patient's overall ventilatory status based on four measurement parameters: etCO
2
,
awRR, pulse rate and SpO
2
. IPI can thus provide an early indication of a change in ventilatory status
which may not be shown by the current value of any of these four parameters individually. The IPI is
designed to provide additional information regarding patient status, possibly before etCO
2
, awRR,
SpO
2
, or pulse rate values reach levels of clinical concern.
The IPI is available for all three groups of pediatric patients (1-3 years, 3-6 years, and 6-12 years), and
for adult patients. It is displayed as a single value between 1 and 10.
Availability of the SpO
2
and pulse values for the IPI calculation is not affected by the labels used or the
SpO
2
technology in the monitor.

Philips MP2 Specifications

General

Brand	Philips
Model	MP2
Category	Medical Equipment
Language	English