Gastric emptying in a group of 49 vomiting infants with infantile hypertrophic pyloric stenosis (IHPS) was investigated using applied potential tomography. Fourteen asymptomatic infants were also studied as a control group. A Dioralyte test feed (25 ml/kg/feed) was used for all the studies. The infants with IHPS were investigated before and at two, four, and seven days after an operation; the other infants were investigated once. The results show that the infants with IHPS have no or little gastric emptying before the operation and gradually return to normal emptying by the seventh day after the operation. A significant difference in gastric emptying was noted between the control infants and the infants with IHPS before and at two and four days after the operation. The applied potential tomography method is suitable for studying gastric emptying in infants, with no morbidity nor complications. It also allows multiple studies to be performed without upset or discomfort.
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