Oxygen Monitoring of Newborns by Skin Electrodes. Correlation Between Arterial and Cutaneously Determined pO2
Measurement of pO2 in tissues or on the skin surface has been evaluated recently by several authors as a means of estimating arterial pO2 or of qualitatively determining the state of oxygenation of the newborn (1–6). The present paper reports results obtained with a skin electrode (Fig. 1) which is heated to 42°C to create local hyperemization of the tissue underneath the electrode (7). Contrary to conventional Clark type electrodes in which the cathode diameter is kept small, we utilize here a large sized cathode (diameter 3 to 10 mm) to obtain an average pO2 value of a sufficiently large skin area. The permeability of the membrane for oxygen was kept low to avoid a disturbation of the oxygen profile in the tissue as a result of oxygen consumption of the sensor. The response time of the sensor to reach 95% of the steady state value, T95%. is 60 seconds. The membrane is held by a cap, the shape of which was chosen such that diffusion of oxygen from the surrounding air to the cathode is prevented.
KeywordsUmbilical Artery Oxygen Profile Skin Electrode Catheter Electrode Confidence Interval Limit
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