Abstract

ABSTRACTThe registration of submaximal sweating during routine physiological monitoring can be conveniently obtained as undulations of the baseline of the electrocardiogram (ECG) recorded on a slow chart (1 mm/sec). The component ECG waves ride the baseline waves with minimal distortion, as demonstrated by short recordings at faster chart speeds. The undulations are not caused by fluctuations in blood flow, as proved by their persistence during tourniqueting of the limbs proximal to the electrodes. During profuse sweating the undulations diminish and even disappear, presumably because the sweat ducts and corneum are saturated and further changes in skin resistance and potential are too small for detection.

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