Gima 35306, Manual

Page: 80 / 693

80
ENGLISH
Chapter 10 Monitoring Oxygen Saturation (SpO
2
)
10.1 Introduction
The functional oxygen saturation (SpO
2
) - a percentage of the hemoglobin that can transport oxygen, is monitored by this
device via a non-invasive optical technique. Based on the principle that oxygenated hemoglobin (HbO
2
) and deoxygenated
hemoglobin (Hb) have different absorption character in the spectrum range from red to infrared light, the device measures
the amount of oxygenated hemoglobin and pulse rate by measuring the absorption of selected wavelengths of light. The
light generated in the probe passes through the tissue and is converted into electrical signals by the photo-detector in
the probe. The SpO
2
module processes the electrical signals and gives out waveform data and digital values for SpO
2
and
pulse rate displayed on the screen.
10.2 Safety Information

Continuous use of fingertip SpO
2
sensor may result in discomfort or pain, especially for those patients with
microcirculatory problem. It is recommended that the sensor should NOT be applied to the same site for over
two hours, please inspect the monitoring site every 1~2 hours for skin integrity, and change the measuring site
periodically if necessary.

Check SpO
2
probe application site periodically (every 30 minutes) to determine circulation, positioning and skin
sensitivity.

SpO
2
measuring site must be examined more carefully for some special patient. Do NOT place the SpO
2
sensor on
the finger with edema or fragile tissue.

Avoid placing the SpO
2
sensor on the same extremity with an arterial catheter, blood pressure cuff, or intravascular
infusion line, otherwise the blood flow could be interrupted by the cuff or the circulatory condition could make
low blood perfusion so that would result in no pulse found or loss of pulse during SpO
2
monitoring and further
cause false alarm.

The SpO
2
measurement of this monitor may not work effectively for all kinds of patients, for whose with weak
pulse due to shock, low ambient/body temperature, major bleeding, or use of vascular contracting drug, the
measurement will be more sensitive to interference, if stable readings cannot be obtained at any time, discontinue
use of SpO
2
monitoring function.

For those with a substantial amount of staining dilution drug (such as methylene blue, indigo green and acid
indigo blue), or carbon monoxide hemoglobin (COHb), or methionine (Me+Hb) or thiosalicylic hemoglobin, and
some with icterus problem, the SpO
2
determination by this monitor may be inaccurate.

The drugs such as dopamine, procaine, prilocaine, lidocaine and butacaine may also be a major factor blamed for
serious error of SpO
2
measurements.

Excessive ambient light may affect the measuring result, it includes fluorescent lamp, dual ruby light, infrared
heater, and direct sunlight etc.

As the SpO
2
value serves as a reference value for judgment of anemic anoxia and toxic anoxia, the measurement
result of some patients with serious anemia may also present as good SpO
2
value.

Do not apply tape to secure the sensor in place or to tape it shut; venous pulsation may lead to inaccurate oxygen
saturation measurements.