RESUMEN
Skin electrogastrogram was made in 40 healthy controls and 32 patients with ulcerative pyloroduodenal stenosis in fasting condition and after mixed meal. Fasting frequency of gastric bioelectric activity (BA) was similar in the patients and the controls (2.65 +/- 0.008; 2.65 +/- 0.008; p < 0.01). BA frequency unstability factor (FUF) was not so high in patients compared to controls (13.9 +/- 0.07; 15.3 +/- 0.11; p < 0.01). The meal produced a significant rise in the frequency, amplitude and a decrease in FUF of gastric BA in the patients and controls but in patients a fall in FUF was greater. A rise in the amplitude of gastric BA in patients was more pronounced than in controls (250.6 +/- 5.17%, 162.0 +/- 2.23%; p < 0.01). In patients the amplitude increased greater in compensated stenosis, weaker--in decompensated stenosis. The changes in gastric BA amplitude varied with severity of pyloroduodenal stenosis.
