Colorimetric Oxymetry

The colorimetric oxymetry is a noninvasive method (nontraumatic) making it possible to determine the contents of the Sang in Oxygène (saturation) according to the variation of color of the first.

The apparatus used is called oxymeter or brine gauge . It consists of a sensor, even formed to him of a red source of light and a sensor of light (in the form of grip or of adhesive), connected to a case analyzer. One places a finger or the ear lobe between the red source of light and the sensor which analyzes the quantity of transmitted light.

A blood rich in oxygen (for example arterial is redder than a blood low in this molecule and it is this difference which is quantified, making it possible to determine oxygen saturation.

This saturation is expressed as a percentage. It is between 95 and 100% at the normal subject, but drops appreciably at the smoker.

A well positioned brine gauge makes it possible to have in real-time the heart rate: when the heart contracts (Systole), it sends Sang oxygenated in the arteries; this blood is of red Couleur . When the heart dilates (Diastole), he “aspires” blood low in oxygen coming from the bodies (return Veine ux). This variation is visualized locally at the ends, where the brine gauge is laid out. The Fréquence of variation of these intensities gives the cardiac rhythm.

This measurement can be distorted by the presence of nail varnish, by the natural color of the skin like by the outside temperature.

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