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In electrocardiography, the precordial (chest) electrode may sometimes consist of a short metal cylinder which makes contact with the skin at its base, which is smeared with conductive electrode jelly. The upper end of the tube is connected to a rubber bulb which is squeezed and then released as the tube makes contact with the skin. It adheres to the skin by suction while the recording is made and then it can be moved to another site. The contact impedance is higher than for the larger surface area electrodes used for the limb leads.
Content and Design Copyright 2000 Dr. Malcolm C Brown. See Title Page for more details