[Electrogastrography and manometry of the stomach in patients with disturbances of basic electrical rhythm]

Electrogastrography (EGG) is the only non-invasive method for investigating the myoelectric activity of the stomach. The aim was to show the relations occurring between the electromyographic and manometric recordings during the normal and abnormal EGG rhythm. A simultaneous EGG recording and manometry were performed in 20 healthy people, in 26 patients with bradygastria (group I) and 21 with tachygastria (group II). In the control group, over 90% of the EGG recording time was in the range of normogastria. After a meal, there were observed a more than twofold increase in the EGG amplitude, an improvement in the recording stability with decrease in the dysarrhythmia percent, an increase in dominant frequency (DF) and a lowering in dominant frequency instability coefficient (DFIC). In groups I and II there was shown a considerable difference in the DF range, an increase in DFIC and the number of dysarrhythmia cases, the lack of correct increase in the amplitude and lowering in the average frequency of phasic contractions and motor indices (MI). Additionally in this group there was a fall in the amplitude of contractions without MMC, and this corroborates with weak contractile activity. There was a positive correlation between the EGG amplitude changes and amplitude of phasic contractions and MI and power ratios (PR) only in the phases I and II MMC. It suggests a relationship between the EGG amplitude and changes in the stomach position and its contraction activity. The lack of correlation between the average EGG frequencies of phasic contractions and the DF and DFIC values does not allowed to observe correlation between the frequency of the phasic contractions and EGG dominant frequency.