Sanmiguel C P, Mintchev M P, Bowes K L
Department of Surgery, University of Alberta, Edmonton.
Can J Gastroenterol. 1998 Sep;12(6):423-30. doi: 10.1155/1998/504345.
Electrogastrography (EGG) is the recording of gastric electrical activity (GEA) from the body surface. The cutaneous signal is low in amplitude and consequently must be amplified considerably. The resultant signal is heavily contaminated with noise, and visual analysis alone of an EGG signal is inadequate. Consequently, EGG recordings require special methodology for acquisition, processing and analysis. Essential components of this methodology involve an adequate system of digital filtering, amplification and analysis, along with minimization of the sources of external noise (random motions of the patient, electrode-skin interface impedance, electrode bending, obesity, etc) and a quantitative interpretation of the recordings. There is a close relationship between GEA and gastric motility. Although it has been demonstrated that EGG satisfactorily reflects internal GEA frequency, there is not acceptable correlation with gastric contractions or gastric emptying. Many attempts have been made to relate EGG 'abnormalities' with clinical syndromes and diseases; however, the diagnostic and clinical value of EGG is still very much in question.
胃电图（EGG）是从体表记录胃电活动（GEA）。皮肤信号的幅度很低，因此必须进行大量放大。所得信号被噪声严重污染，仅对EGG信号进行视觉分析是不够的。因此，EGG记录需要特殊的采集、处理和分析方法。该方法的基本组成部分包括一个适当的数字滤波、放大和分析系统，同时尽量减少外部噪声源（患者的随机运动、电极-皮肤界面阻抗、电极弯曲、肥胖等）以及对记录进行定量解释。胃电活动与胃动力之间存在密切关系。尽管已经证明EGG能够令人满意地反映内部胃电活动频率，但与胃收缩或胃排空之间并没有可接受的相关性。人们已经进行了许多尝试，将EGG“异常”与临床综合征和疾病联系起来；然而，EGG的诊断和临床价值仍然存在很大疑问。
