INTRODUCTIONNon-ulcer dyspepsia (NUD) is characterized by persistent or recurrent epigastric symptoms including pain and fullness, early satiety, nausea, and/or vomiting that are not explained by structural or biochemical abnormalities. 1 Recent studies have indicated that NUD might be a result of abnormalities in gastric physiology. NUD patients demonstrate a reduced sensory threshold to gastric distension compared to controls. 2±4 Motor abnormalities include a decreased antral and/or antroduodenal contractile response to the ingestion of a meal or uncoordinated and/or non-propagated duodenaljejunal motor waves. 5,6 These abnormalities of gastric motor physiology are often accompanied by delayed gastric emptying 7±10 and maldistribution of food in the stomach. 11 The maldistribution of food may also be related to impaired gastric accommodation, 2 resulting in increased food loading of the antrum following a meal. The electrogastrogram (EGG) is a non-invasive test used to measure gastric myoelectrical activity. Normal gastric myoelectrical activity consists of a slow wave and spike potentials. The EGG accurately records the slow wave, which controls the velocity and propagation of gastric contractions. Previous studies have demonstrated that the EGG is reproducible and stable over time. 12 In addition, the EGG is not affected by age or gender. 13 The EGG detects gastric dysrhythmias, either fast frequency waves (tachygastria) or slow frequency waves (bradygastria). Studies using serosal transducers and manometry have shown that tachygastrias correlate with absent antral contractions 14 and bradygastrias are associated with both strong and or absent antral SUMMARY Background: The electrogastrogram (EGG), which records gastric myoelectrical activity, is abnormal in onethird of adult patients with non-ulcer dyspepsia (NUD). Aim: To observe the effects of cisapride on EGG in adults with NUD. Methods: Twenty-seven NUD patients who had undergone a pre-and post-prandial EGG were entered into an open study. All patients completed a dyspepsia symptom questionnaire and were then treated with cisapride 10 mg t.d.s. The dyspepsia questionnaire was repeated in all those completing 4 weeks of treatment. Those with an initial abnormal EGG (< 70% of slow wave