Amplitude variations in human duodenal slow waves are predominantly caused by the summation of two signals, which can be used to infer the degree of electrical coupling between cells.
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Caution in interpreting duodenal slow-wave amplitudes clinically; extends models of electrical coupling for GI research.
Regular amplitude variations have frequently been observed in the slow-wave electrical signals recorded from the human duodenum. The amplitude variations could be the result of amplitude modulation of a single frequency signal, or the result of the summation of two signals at different frequencies. Signals were recorded from the serosal surface of the human duodenum. Frequency analysis of the signals, using both Fast Fourier Transform and Auto-Regressive Modelling techniques, shows that the predominant cause of the amplitude variations is the summation of two signals. The implications that the results have for models of the electrical activity of the human duodenum are discussed, and it is shown that an estimate of the degree of electrical coupling between cells can be inferred.
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Smallwood et al. (1980) studied this question.
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