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Changes in gastric electrical activity in patients with severe post‐operative nausea and vomiting

Gastric electrical activity in a group of patients with severe nausea and repeated vomiting in the post‐operative phase following major abdominal surgery (Group A, n = 21), was compared to that in a control group of patients without symptoms after colonic surgery (Group B, n = 14). Physical signs related to the digestive tract were assessed and electrical activity of the stomach was measured non‐invasively by means of electrogastrography (EGG) and impedance gastrography (IGG). Two EGG/IGG recordings were performed in each patient. In group A the first recording was carried out after the onset of nausea and/or vomiting and a second control recording after disappearance of these symptoms and resumption of a normal diet. In group B the post‐operative recording was performed on the second post‐operative day, the control EGG/IGG signals were recorded pre‐operatively. EGG and IGG could be successfully recorded in the post‐operative phase, even in nauseated and vomiting patients. During post‐operative nausea and vomiting power and frequency of the normal gastric myoelectrical activity (0.04–0.06 Hz) were not significantly lower than in the control recordings. In the first post‐operative recordings (in Group A during nausea and vomiting and in Group B on the second post‐operative day) an increased incidence of abnormal gastric frequencies (tachygastrias, 0.10–0.18 Hz) was observed in both groups. No significant difference between the groups was found. After nausea and vomiting had subsided in Group A, the incidence of tachygastrias was persistently high.