Question
Identify the apparatus used in paediatrics as shown in photograph below ?
A. Hemoglobinometer.
B. Pulse oximeter.
C. Bilirubin analyser.
D. Glucometer.
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Correct Answer » B Explanation |
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The apparatus shown in the picture above represents pulse oximeter.
Pulse oximetry is a non-invasive method for monitoring a person’s oxygen saturation (SO2). Its reading of SpO2 (peripheral oxygen saturation) is not always identical to the reading of SaO2 (arterial oxygen saturation) from arterial blood gas analysis, but the two are correlated well enough that the safe, convenient, noninvasive, inexpensive pulse oximetry method is valuable for measuring oxygen saturation in clinical use.In its most common (transmissive) application mode, a sensor device is placed on a thin part of the patient’s body, usually a fingertip or earlobe, or in the case of an infant, across a foot. The device passes two wavelengths of light through the body part to a photodetector.
It measures the changing absorbance at each of the wavelengths allowing it to determine the absorbances due to the pulsing arterial blood alone, excluding venous blood, skin, bone, muscle, fat, and (in most cases) nail polish.Less commonly, reflectance pulse oximetry is used as an alternative to transmissive pulse oximetery described above.
This method does not require a thin section of the person’s body and is therefore well suited to a universal application such as the feet, forehead, and chest, but it also has some limitations.