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Simultaneous recording of gastrointestinal migrating motor complex and duodenal pressure. During phase I, duodenal pressure changes are observed. Luminal pressure of the duodenum increases by 20-30 H2O, just before the occurrence of duodenal phase II and III (an open arrow). Duodenal phase II (an open arrow) is followed by gastric phase III (a solid arrow). Open squares indicate phase II contractions and closed squares indicate phase III contractions. Adapted from Nakajima et al.61
