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16Monitoring Intravascular
Oxygen Saturation
Depending on the probe or catheter used and the measurement location, the two modules, M1011A
and M1021A, measure the central venous oxygen saturation or mixed venous oxygen saturation
continuously and invasively.
The two modules can be differentiated by their size and their labeling. The M1011A is a single-width
module (narrow) and is labeled SO
2
. The M1021A is a double-width module (wide) and is labeled
SvO
2
.
WARNING
Injected dyes, such as methylene blue, or intravascular dyshemoglobin may lead to inaccurate
measurements.
Do not monitor oxygen saturation during infusion of I.V. fat emulsion or other turbid substances
through the distal lumen of the OptiCath catheter. These liquids might temporarily modify the blood
scattering and absorption characteristics at the catheter tip. This interferes with the optical
measurement of oxygen saturation. After infusion is complete, you can again monitor oxygen
saturation accurately.
During injection of the bolus for thermodilution cardiac output measurements, the SvO
2
measurement might be disturbed.
Explosion Hazard: Do not use in the presence of flammable anesthetics or gases, such as a
flammable anesthetic mixture with air, oxygen or nitrous oxide. Use of the devices in such an
environment may present an explosion hazard.
1 M1011A
2 M1021A
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