[Electrogastograph during interdigestive and digestive stages in patients with functional dyspepsia]

To investigate the relationship between dynamic change of electrogastrogram (EGG) with motility index of antrum during migrating motor complex (MMC) cycle in healthy subjects and functional dyspepsia, and to verify whether a 100% coupling of electrical and mechanical events existed after meal.

Eleven healthy subjects (HS) and 14 patients with functional dyspepsia (FD) were studied. An 8-channel Dent-sleeve catheter was positioned under fluoroscopic guidance across antropyloroduodenal region and bipolar electrodes were attached to the skin corresponding to the location of antrum. Antropyloroduodenal pressure waves and electrical signals were transferred simultaneously to PC Polygraph (CTD) and recorded for 3 hours preprandially and 2 hours after ingestion of 40 g solid meal (336 kJ). The power of EGG and motility index (MI) of antral contractions were calculated as the area under curve (AUC) by a build-in computer program.

The power increases of EGG increased significantly in phase II (P < 0.01), phase III (P < 0.01) and after meal (P < 0.01) compared with phase I in HS, however, this dynamic increase was not found in FD. The power of EGG was positively correlated with the motility index of antrum both in HS (r = 0.87, P < 0.01) and in FD (r = 0.79, P < 0.01) during the interdigestive period. A significant increase of EGG power after meal was found in HS, which corresponded to the degree of phase III and kept stable for the whole postprandial period. In contrast, power increase was not found in FD except during 30 min after test meal.

Prolonged cutaneous EGG recording can reflect the periodic variation of MMC cycle. EGG response in HS but not in FD after meal is characterized as persistent increase which is corresponded to phase III.