System for acquisition and analysis of multichannel electrogastrogram

This paper presents the development of a system for recording and analysis of three electrogastrogram (EGG) signals and two monitor signals: respiration and body movement and its route along the stomach wall. The signals were recorded from three pairs of electrodes located on the external abdominal wall, filtered with a low pass filter with cut off frequency of 1 Hz and acquired with a sampled frequency of 10 Hz. This system obtains the pacemaker frequency from the power spectrum of the EGG signal and computes parameters associated with the pacemaker frequency such as percentages of bradygastria, taquigastria, arrhythmia and typical range during the recording time. The analysis is performed on-line and signals can be off-line reanalyzed. Because the system will be used for generating an EGG database for specific use, it was required a specific classification. All recordings contain a clinical and technical sheet in order to be useful in further processing. The system were characterized and validated with simulated and real signals presenting a friendly and easy use with good performance and it is compatible with Windows 2000/XP and Vista^®.