S. Homma et al., ELECTROGASTROGRAPHY PRIOR TO AND FOLLOWING TOTAL GASTRECTOMY, SUBTOTAL GASTRECTOMY, AND GASTRIC TUBE FORMATION, Digestive diseases and sciences, 40(4), 1995, pp. 893-900
On electrogastrography (EGG) spectral analysis, an activity of 3 cycle
s per minute (cpm) is supposed to be specific for the stomach. After t
otal or subtotal gastrectomy, the original site of the stomach is occu
pied mainly by the intestine. We attempted to determine if intestinal
activity could be recorded in this region with EGG. Epigastric recordi
ngs were performed in patients prior and following gastrointestinal or
control surgeries. Spectral analysis, using the maximal entropy metho
d and ensemble means was applied to data analysis from these recording
s. Preoperatively, the majority of the power peaks were found around 3
, 6, and 11 cpm. The postprandial-to-fasting power ratio of all of the
se power peaks increased significantly postprandially (P < 0.05-0.01).
Following total gastrectomy, the power peak around 3 cpm disappeared
or was significantly diminished in amplitude (P < 0.05). The postopera
tive-to-preoperative power ratio ranged from 0.03 to 0.10 (P < 0.001-0
.01). However, the power peak around 11 cpm did not significantly chan
ge prior to or following total gastrectomy, and the 11 cpm peak appear
ed relatively dominant. Simultaneous manometric studies in the Roux li
mb demonstrated a correlation between the power spectral frequency of
EGG and manometry at 11 cpm. Therefore, the 11 cpm peak appeared to re
flect jejunal or Roux limb electrical activity. The postoperative to p
reoperative power ratio for the 3 cpm also was significantly reduced f
ollowing subtotal gastrectomy and gastric tube formation in patients i
n the postprandial state (P < 0.05-0.001).