Transcutaneous PO2 Measurement at 37 °C in Children with Diabetes
Transcutaneous oxygen pressure measurements (tcPO2) are used widely in the fields of perinatology and anesthesiology . Noninvasive continuous monitoring of arterial oxygen pressure (PaO2) requires maximal hyperemia of the skin under the electrode. This is achieved with an electrode temperature of 44° –45 °C. If the circulation in the skin is impaired, i. e., the patient is in shock with disturbed central and/or peripheral circulation, a discrepancy between tcPO2 and PaO2 occurs . The influence of the circulation on tcPO2 becomes more evident when the normal regulation of the vessel tone is not disturbed by heating. Absence of heating also permits the study of physiological vascular reactivity. With an electrode temperature of 37 °C, we obtained reproducible measurements of the changes in blood flow occurring during postocclusive reactive hyperemia [3, 4].
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