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Watch the EGG Overview Slide Show!



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Electrogastrogram - Gastric Dysrhythmia Testing DeviceElectrogastrogram - Designed for patients with undiagnosed digestive disorders. Electrogastrogram - Shown to aid diagnos of Gastric DysrhythmiaElectrogastrogram - Designed for patients with undiagnosed digestive disorders. Electrogastrogram - Shown to aid diagnos of Gastric Dysrhythmia

The 3CPM Company’s Electrogastrogram (EGG) Machine is an analysis system that records, stores, displays and prints the myoelectric signals from the stomach as an aid to diagnosis of various gastric motility disorders.


Optimum use of this device requires a basic familiarity with the published literature which describes typical EGG patterns commonly encountered in clinical practice with specific patient groups and related interpretative techniques.  An appendix is provided at the end of this manual, however, which illustrates the data and printed displays produced by this device.  The setting up of the equipment is described in the section on equipment setup.


The filter characteristics of the amplifier allow those biological signals with approximate frequency ranges from 1 to 15 cycles per minute (cpm) to pass through for recording and digitization.  Two channels of data are recorded during the session.  One of these is the Electrogastrogram signal itself; the other channel records respiratory rates.  This respiratory recording channel is used to help identify artifact in the EGG signal caused by movement, deep breathing, etc.


The analog signals recorded from the EGG skin electrodes and the respiratory belt are amplified, filtered and fed into four cables.  The cables are connected to a computer which has been equipped with an analog to digital (A/D) converter for digitization of the Electrogastrogram  signal.


The data file that is created during the A/D conversion of the EGG signal undergoes Fourier transform (FFT), an analysis of the frequencies contained in the EGG signal and a running spectral analysis (RSA).  A plot of the RSA and calculation of the percentage of power in selected frequency bands are reports produced by the Electrogastrogram  analysis system.


These Electrogastrogram datum are presented in four major frequency ranges:

  • normal (2.5 to 3.75 cpm)

  • bradygastria (1.0 - 2.5 cpm)

  • tachygastria (3.75 - 10.0 cpm)

  • duodenal-respiratory (10.0 - 15 cpm)

The data in these ranges are described in four ways:

1.      the raw power (log  mV2)

2.      the percentage distribution of the power in the specific ranges described above

3.      the ratio of power based on postprandial to preprandial power

4.      the RSA of the Electrogastrogram  recording presented in a pseudo-3-D format


Copyright 2007 - 2008

The 3CPM Company

7402 York Road, Suite 101

Towson, Maryland   21204