We don't know how deep this goes, this racism within healthcare. If we don't identify these problems, we can't fix them, and so that's part of the issue. Vasodilation and pooling of venous blood in the head due to compromised venous return to the heart, as occurs with congenital cyanotic heart disease patients, or in patients in the Trendelenburg position, can cause a combination of arterial and venous pulsations in the forehead region and lead to spurious SpO2 results.Īs someone who has been involved in this work and has found something similar in a different diagnostic tool - pulse oximetry - unfortunately, I'm not surprised, we don't know whether these problems exist unless we look for them, and if we don't look for them, we're not going to identify these problems. This method does not require a thin section of the patient's body and is therefore well suited to more universal application such as the feet, forehead and chest, but it also has some limitations. Reflectance pulse oximetry may be used as an alternative to transmissive pulse oximetery described above.
With NIRS it is possible to measure both oxygenated and deoxygenated hemoglobin on a peripheral scale. The changing absorbance at each of the wavelengths is measured, allowing determination of the absorbances due to the pulsing arterial blood alone, excluding venous blood, skin, bone, muscle, fat, and nail polish. Light of two wavelengths is passed through the patient to a photodetector. Pulse oximetry is a non-invasive method allowing the monitoring of the saturation of a patient's hemoglobin.Ī sensor 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. Such conditions occur while undergoing anesthesia with endotracheal intubation and mechanical ventilation or in patients in the Trendelenburg position.įreebase (0.00 / 0 votes) Rate this definition: Vasodilation and pooling of venous blood in the head due to compromised venous return to the heart can cause a combination of arterial and venous pulsations in the forehead region and lead to spurious SpO2 results. 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. 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.Reflectance pulse oximetry is a less common alternative to transmissive pulse oximetry. The device passes two wavelengths of light through the body part to a photodetector. 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.
Though its reading of peripheral oxygen saturation (SpO2) is not always identical to the more desirable reading of arterial oxygen saturation (SaO2) from arterial blood gas analysis, the two are correlated well enough that the safe, convenient, noninvasive, inexpensive pulse oximetry method is valuable for measuring oxygen saturation in clinical use. Pulse oximetry is a noninvasive method for monitoring a person's oxygen saturation. Wikipedia (0.00 / 0 votes) Rate this definition:
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