Chen J, McCallum R W
Department of Medicine, University of Virginia Health Science Center, Charlottesville 22908.
Med Biol Eng Comput. 1991 Jul;29(4):351-7. doi: 10.1007/BF02441654.
The gastric electric activity paces the contractions of the stomach and can be measured noninvasively using surface electrodes placed on the abdomen. In this paper, response of the gastric electric activity to water and a solid meal was investigated using surface electrodes. Applying an improved recording technique, power spectral analysis and statistical analysis methods, the gastric electric activity in preprandial, postwater and postprandial states was measured and analysed from ten healthy volunteers. To more convincingly show the effect of water and the solid meal on the gastric slow wave and gastric motility, simultaneous recordings of the cutaneous EGG and manometric activities in the stomach were performed in three gastroparetic patients. It was found that water does not induce contractions of the stomach, but the gastric slow wave amplitude increases (p less than 0.05) and frequency decreases (p less than 0.05). The solid meal results in an increase in both the amplitude (p less than 0.01) and the frequency (p less than 0.02) of the gastric slow wave. It appears that the postprandial EGG amplitude increases because of a combination of stomach contractions and gastric distension bringing the stomach closer to the recording electrodes. The slow wave frequency, however, correlates well with stomach contractions.
胃电活动调节胃部的收缩，可使用置于腹部的表面电极进行无创测量。本文采用表面电极研究了胃电活动对水和固体食物的反应。应用改进的记录技术、功率谱分析和统计分析方法，对10名健康志愿者在餐前、饮水后和餐后状态下的胃电活动进行了测量和分析。为了更有说服力地展示水和固体食物对胃慢波和胃动力的影响，对3名胃轻瘫患者同时记录了皮肤胃电图（EGG）和胃内压力活动。研究发现，水不会诱发胃部收缩，但胃慢波振幅增加（p<0.05）且频率降低（p<0.05）。固体食物会导致胃慢波的振幅（p<0.01）和频率（p<0.02）均增加。餐后EGG振幅增加似乎是胃收缩和胃扩张共同作用的结果，胃扩张使胃更靠近记录电极。然而，慢波频率与胃部收缩密切相关。
