Houston Methodist. Leading Medicine.
Houston Methodist. Leading Medicine

Electrogastrography

Testing Information: Electrogastrography

What is Electrogastrography?

Electrogastrography refers to the method of recording electrogastrograms (EGGs). Electrogastrograms are noninvasive recordings of the electrical activity of the stomach. Electrical activity of the stomach controls the timing and speed of gastric peristaltic contractions. The peristaltic contractions are responsible for mixing and emptying food that is eaten throughout the day. In healthy humans the stomach’s electrical rhythm is set by a “pacemaker” to about 3 cycles per minute. Gastric dysrhythmias (abnormal rhythms) occur if the electrical activity is too fast (tachygastria) or too slow (bradygastria). Gastric dysrhythmias are common in the clinical setting of nausea, functional dyspepsia and gastroparesis. Correction of gastric dysrhythmias with drug therapy is associated with improvement in chronic nausea and vomiting.

Indications

This test is done to determine if abnormal electrical activity of the stomach causes nausea, vomiting or abdominal pain.

Risks

Some patients may have irritation of the skin at the electrode sites.

Before the procedure

Discontinue use of all drugs that can affect gastric motility such as prokinetics (Reglan®, Propulsid®, Domperodone®, Erythromycin, Zelnorm®), narcotics, anticholinergics (Bentyl®, Levsinl®, Donnatal®), antiemetics (Compazine®, Tigan®, Zofran®), NSAIDs (Motrin®, Advil®), antidepressants, oral contraceptives, tobacco and alcohol.

What to do the night before the procedure

Do not eat or drink anything after midnight prior to the day of your test.

Preparing for the procedure

The patient is admitted to the Reflux Center as an outpatient. Vital signs are taken. The test requires no pre-medication.

During the procedure

The test is recorded for 30 minutes in the fasting state and then for 1-2 hours after an appropriate test meal. The test meal may consist of 2 scrambled eggs, 2 pieces of white bread with 1 packet of butter and 4 oz of orange juice or 2 slices of turkey with 2 slices of white bread with 1 package of mayonnaise and 1 can of Ensure®.

After the procedure

You may drive yourself home after the procedure.