Electrogastrography

Electrogastrography is the method of registration of action potentials stomach, reflecting its motor function, with the help of the device of electrogastrography.
Electrogastrography produce on an empty stomach (it is necessary to clean the intestines) after the trial Breakfast (150 grams of white bread and 1 Cup of sweet tea) in the supine position the patient for 40-60 minutes
Differently (working) electrode (sucker) impose on the anterior abdominal wall in the midline of the abdomen on the antral section of the stomach, which determine radiographically. The second electrode is placed on the right leg. Before applying the electrodes grease with a special electrode paste.
Analysis of electrogastrogram produced on the basis of the size of teeth and frequency of rhythm (Fig).


Electrogastrogram sick stomach ulcers: 1 - before treatment; 2 - after treatment.

Electrogastrography produce in diseases of the stomach to determine the status of his motor functions and to clarify the action of medicinal substances.

Electrogastrography (gr. gaster - stomach, grapho - writing, recording) is a method of registration of electric potentials arising in the stomach in its activities.
C. Y. chagovets al. consider occur in the stomach electric currents, the result of the activity of digestive glands. Other authors consider these currents as a result of muscular activity of the stomach. Parallel balanokittychacha and electrogastrography study in healthy and suffering from chronic gastritis and pyloric stenosis showed that the teeth of electrogastrogram and mahanavami the same time, the magnitude and even the shape. Teeth electrogastrogram reflect the currents that occur during the peristaltic activity of the stomach. Accordingly, it is proposed to call electrogastrography fluctuations potential "peristaltic teeth electrogastrogram" instead of the old term "spontaneous fluctuations of biopotential of the stomach" (L., Krasilnikov).
I. I. Dahowski and C. C. Rusyns (1939) first used electrogastrography to the characteristics of the motor function of the stomach. Was developed and the method of record of currents of the stomach in a person with a front abdominal wall. M. A. Sebekinym and engineers M. A. Gurevich, S. M. Yakovlev and L. N. Mishin created electrogastrography EHS-1, EHS-2, EHS-3, allowing to register with the body surface slow changes of the currents (2-3 fluctuations in 1 min), corresponding to the rhythm of the peristaltic activity of the stomach. Due to the narrow bandwidth of frequencies (0,05 - 0,2 Hz) electrogastrogram provides selective record from the surface of the body especially those fluctuations currents, changes which occur with the rhythm of the motility of the stomach. In the new electrogastrography significantly reduced the speed of the recording tape (up to 10 mm in 1 min).
To record electrogastrogram method Sobakina investigated gets in the morning standard Breakfast (1 Cup of sweet tea and 150 grams of white bread), and 1-2 drink of barium mass. Radiographically (in horizontal position of the patient on tracheascopy) determine the projection antrum - overlapping differentage electrode. Electrogastrogram removed within 30-60 min

Fig. 1. Electrogastrogram healthy person (Sobakin). Right sizing: the height of the bars corresponds 0,25-0,5-1 mV. At the bottom of the timer (in minutes).

Before writing and upon its completion establish the calibration potentials (0,25-0,5 - 1; Fig. 1). This method of electrogastrography simple, physiological and available for use in a wide clinical practice. It allows to study the dynamics of peristaltic function of the stomach (rhythm, depth) in the period of digestion virtually all patients than favorably with other methods of research of motor function of the stomach.
In healthy people during digestion A. S. Belousov revealed various amplitudes of oscillations on electrogastrogram: some they were 0.2-0,28 mW, others 0,48-0,75 mW. Differences are caused typological peculiarities of motor-evacuation function of the stomach.
L. G. Krasilnikov and B. I. Piston-RISS has established three types electrogastrography curves in healthy people: normostenichesky with the amplitude of teeth of 0.2-0.4 mV, hyperkinetic with the amplitude of teeth exceeding 0.4 mV, and hypokinetic with the amplitude of teeth below 0.2 mV.
In pathological processes, accompanied by violation of gastric motility (ulcer in the phase of deterioration, organic stenosis antrum), there are specific changes in electrogastrogram. Violated the right rhythm, battlements on the curve obtained different amplitude (Fig. 2). When remitting a painful process or full recovery of electrogastrogram normalized.

Fig. 2. Electrogastrogram patients with impaired gastric motility (Belousova): a - in a patient with peptic ulcer duodenal ulcers with the expressed pain syndrome; b - in the same patient after the cessation of pain and improve the overall condition; in a patient with organic stenosis antrum.

Electrogastrography used to study the effects on motor function of the stomach different pharmacological agents with a single one of their introduction. Reception 2-5 g of sodium bicarbonate (bicarbonate of soda) causes an increase in the amplitude of oscillations at electrogastrogram. Hydrochloric acid inhibits the peristaltic activity of the stomach: electrogastrogram registered small amplitude of oscillations (A. S. Belousov, G. L. Levin). In healthy people and in patients with peptic ulcer atropine reduces the amplitude of oscillations at electrogastrogram, morphine increases. However, the atropine and morphine in patients lasts much longer and is pronounced than in healthy (L., Krasilnikov).
Further accumulation of experience electrogastrography research, create multi-channel electrogastrography (L., Krasil'nikov, I. I. Berger, 1967) help to identify features and character disorders, gastric motility, differential diagnosis of diseases of the stomach.