Usefulness of a developed four-channel EGG system with running spectrum analysis

Electrogaserography (EGG) is a method of measuring action potentials on the abdomen, it is noninvasive, inexpensive and easy to measure. HoP;ever, the EGG signal has a very low frequency (0.05 Hz) and an extremely low amplitude (10-100 mu V). Consequently, its measured waveform is difficult to analyze and it is not yet completely understood. In this study, a Four-channel EGG measurement system was built to measure the action potential of the stomach. This system was compared with the commercially available one-channel Digitrapper EGG. The 3 cpm percentages were compared between the best channel of the four-channel system and channel 1, whose electrode position was similar to the commercially available one-channel system for normal subjects. The average 3 cpm percentage of the best channel and channel 1 for preprandial measurement was 83.5% and 83.2%, respectively, and this was statistically significant (p<0.001). Also the average 3 cpm percentage of the best channel and channel 1 for postprandial measurement was 90.4% and 76.5%, respectively, and this was statistically significant (p=0.003). From these results, it can be concluded that a multi-channel EGG system is required For better EGG measurement.