Study of electrogastrography : its measurement and analysis

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Study of electrogastrography : its measurement and analysis


Author: Wong, King-chi
Title: Study of electrogastrography : its measurement and analysis
Year: 1999
Subject: Electrogastrography
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Jockey Club Rehabilitation Engineering Centre
Pages: iv, 152 leaves : ill. ; 30 cm
Language: English
InnoPac Record:
Abstract: Electrogastrogram or EGG is the measurement of electrical activity of the stomach using cutaneous electrodes positioned over the abdominal wall. Two kinds of gastric electrical activities have been observed: the electrical control activity (ECA) and the contraction related electrical response activity (ERA). The ECA is present all the time and is responsible for electrical pacing function. The usual frequency of EGG is about 3 cycles per minute (cpm), but may varies between I cpm (bradygastria) to 9 cpm (tachygastria) associated with certain pathological conditions. In the first part of this study, the history of development of electrogastrography, the anatomy, physiology, and electrical activities of the stomach were briefly reviewed. The method of measurement and various techniques used for frequency analysis of the EGG were discussed. In the second part, the EGG of twenty subjects was measured using AMLAB II. Ten of them were normal individuals while the other ten were proven duodenal ulcer patients. The frequency of he EGGs of these two groups were analysed with MATLAB software using fast Fourier transform (FFT) and adaptive autoregressive moving average (ARMA) methods and compared statistically. The average frequency of the EGG measured was 2.34 cpm, it was slightly lower than the average 3 cpm reported in the literature, but still within normal limit of 2 - 4 cpm. There was no statistical significant difference in the frequency of the EGG between the two groups. The EGGs were also studied using wavelet analysis, results suggested that EGG did not has any significant high frequency components. Finally, the results of the study were discussed. The various methods of mathematical modelling of gastric electrical activity reported in the literature were also reviewed.

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