Abstract
The smooth muscle of the gastrointestinal (GI) system produces two types of electrical activity that may be detected electrically or magnetically. The slow-wave, or basic electrical rhythm (BER) is a sinusoidal type of activity that oscillates about 3 times per minute in the human stomach and 8–12 times per minute in the small intestine. The electrical response activity is a higher-frequency spiking potential that is strongly associated with segmental contractions of the bowel that propel intestinal contents along the GI tract. Our previous studies on intestinal electrical activity have shown that magnetic measurements taken outside the abdomen correlate strongly with recordings from electrodes placed on the serosal surface of the bowel, and that external magnetic measurements are superior to cutaneous electrode measurements because of the attenuation and smearing of the potential by low-conductivity layers in the abdomen [1, 2].
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