87
excessive movement.
Warning
In a long and continuous monitoring process, check the condition of the peripheral
circulation and skin under measuring every 2 hours or so, and if negative conditions
happen, timely change the site under measurement.
In a long and continuous monitoring process, it is advisable to check periodically the
positioning of the probe to avoid inaccurate measurement due to changing in the
positioning from moving or other factors.
13.4 Measurement restriction
Measurement restriction
During operation, the following factors may affect accuracy of SpO2 measurement:
High-frequency electric disturbance, such as disturbance generated from the system itself or
electrosurgery equipments connected with the system;
A photo-oximeter and SPO2 sensor are used during MRI process, as the inductive current may
cause burns;
Intravenous Dye;
Frequent movement by patient;
Light radiation from outside;
Improper installation of the sensor or improper touching position with objects;
Improper sensor temperature (ideal temperature should be 28℃-42 );℃
The sensor is put onto body with blood pressure cuff, arterial duct or vein tube;
Contents of non-functional Hb such as COHb and MetHb;
SPO2 over low;
Bad microvascular perfusion at the test position;
Shock, anemia, low temperature and application of vessel shrinking medicines, which all can
reduce the arterial blood flow to a non-measurable level;
Measurement is also up to absorption of lights with special wavelengths by oxyhemoglobin and
deoxygenated hemoglobin. Existence of other materials that absorbs the same wavelengths, such
as carbonated hemoglobin, hemoglobin, methylene blue and indi carmine, will make artificial or
low SPO2 values.
SPO2 sensor introduced in the accessory is recommended.
To Next Page
Loading...