Fig. 9. The retrograde transport of the retrograde giant contraction (RGC) spike potential. The figure depicts the myoelectric activity of gastric antrum (A) and small intestine recorded during a spontaneous occurrence of vomiting. In particular, note the loss of electrical control activity (ECA) just before the occurrence of the RGC spike potential (indicated at the downward arrows), and its retrograde movement through the digestive tract starting at 150 cm from the pylorus. Below the starting point of the RGC potential at 200 cm from the pylorus, the ECA rate decreases for almost 2 minutes. A, antrum; D, duodenum; J-I#, jejunum-ileum in which # is just the orad to caudad relationship of the electrodes. The numbers in parenthesis indicate the distance the electrodes are from the pylorus. Adapted from Lang et al.
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