Local differences in electrogastrographic indices associated with total gastrectomy, total colectomy, distal gastrectomy and colonic replacement

Abstract

The electrogastrographic indices of spectral frequency, instability factor (IF), power amplitude, and power content (%) were compared between control subjects (C), and subjects following either total gastrectomy (TG), total colectomy (TC), distal gastrectomy (DG) or colonic replacement surgery (CR). In the fasting state, both the spectral frequency and IF of the epigastric 3-cycle per minute (cpm) group of the TC subjects were significantly lower than those indices in C, TG, DG, and CR subjects. In contrast, the power amplitude and power content of the epigastric 3-cpm group of both TG and DG subjects were significantly lower than those of C and TC subjects. The original epigastric waves of TG had remarkably high amplitudes. Furthermore, the absolute power of the epigastric 3-cpm of the TC subjects was 10 times higher than that in either the C or TG subjects. These results may be partially explained by the assumption that the recorded epigastric electrogastrography (EGG) is mainly contributed to by the 3-cpm myoelectric activity of the stomach and colon, while the infraumbilical EGG is mainly contributed to by the 3-cpm myoelectric activity of the colon. Topographic EGG maps visually supported these assumptions.

The effects of stress during the mirror drawing test on electrogastrograms of subjects who underwent gastrointestinal surgery involving either total gastrectomy, distal gastrectomy, or total esophagectomy with colonic replacement

“…Examples of piled running spectra during rest and MDT were shown in a previous paper ( 7 ). The original raw EGG waves, and analyzed power spectral waves in the piled manner, both during rest, during the MDT, and in the post-MDT state were also shown in a previous paper including control and surgical groups of TG, TC, DG, and CR ( 5 , 6 , 7 ). The % at rest of a certain frequency group was defined as the power area of a certain frequency group/total area of the spectrum, i.e., the area encircled by a spectrum envelope line and abscissa.…”

“… ). These 16 locations have been cited in previous papers ( 5 , 6 , 7 ). The amplifier was a modified electroencephalograph (EEG) amplifier (time constant = 5 sec, high cut = 0.5 Hz and –12 dB/oct, low cut = –6 dB/oct: Biotop 6R 12–4, NEC-Sanei, Japan).…”

“…The ages of the 58 normal control subjects ranged from 20–38 years old. Data from the operated group in this study were obtained from volunteer outpatients after either TG, TC, DG, or CR at the Niigata Medical and Dental Hospital ( 6 ). The ages and time since surgery ranged widely in the patients, depending on the type of surgery: TG due to gastric cancer (67.6 ± 11.8 years old, 63.0 ± 67.0 postoperative months [POM], n =9), TC due to ulcerative colitis (39 ± 13 years old, 43.3 ± 29.3 POM, n =10), DG due to gastric cancer (Birlloth I, 72 ± 33 years old, 115 ± 31.7 POM, n =12), and CR due to esophageal and gastric cancer (66.2 ± 43 years old, 64.0 ± 33.7 POM, n =5).…”

“…The methods for recording and analyzing EGGs, and making topographical EGG maps were the same as those employed in previous studies ( 5 , 6 , 7 , 8 ). In brief, unipolar EGGs were recorded at 16 locations (channels) on the thoraco-abdominal skin surface, using reference electrodes on the right leg ( Fig.…”

Current status of multichannel electrogastrography and examples of its use

“…It has also been used to assess the efficacy of gastroprokinetic agents (19, 20) and the outcome of gastrointestinal surgery (21,22,23,24,25,26,27). EGG is useful not only for assessing disease conditions, but also for providing new insights into gastrointestinal motility.…”