In vivo recording of the glucose- and disaccharide-evoked potentials from the human jejunum in infancy

✍ Scribed by Yutaka Igarashi; Masayoshi Himukai; Tasuke Konno

• Publisher: Springer
• Year: 1981
• Tongue: English
• Weight: 504 KB
• Volume: 135
• Category: Article
• ISSN: 0340-6997
• DOI: 10.1007/bf00442099

✦ Synopsis

Using a pair of Ag-AgCI electrodes, the sugarevoked potentials (APD) were recorded from the jejunum of human infants in vivo by infusion of Ringer's solution containing glucose or a disaccharide through an intestinal tube. One of Ag-AgC1 electrodes was fixed inside the tip of the intestinal tube and the other was placed in the hypodermis. The sugars tested were D-glucose, lactose, maltose and D-xylose. In the case of D-glucose, a simple Michaefis-Menten relation was seen between the amplitude of APD and concentration, and the values of Kt and A PDmax for the control infants were 14.4 _+ 2.8 mM and 11.4 _+ 2.3 mV, respectively (mean _+ SD, n = 8). Disaccharides gave a similar relationship over a wide range of concentrations except for very high concentrations, where Lineweaver-Burk plots of the data deviated slightly upward from the linear plot obtained at lower concentrations. Extrapolation of the linear segment of the plots for the disaccharide-evoked potential crossed the ordinate at the same point as the line for glucose-induced potentials. The mean magnitude of APD .... for glucose in infants with intractable diarrhea was significantly lower (about 56%) than that in the control infants, but the Kt values were not significantly different. The ratios of APD induced by 100mM maltose to APD induced by 100 mM glucose in the patients with intractable diarrhea were not different from those in controls, while the ratios of APD induced by 100mM lactose to APD induced by 100mM glucose were decreased. At the recovery stage of intractable diarrhea, the magnitude of ArDmax for glucose and the ratio of APD induced by 100mM lactose to APD induced by 100mM glucose were increased to the control level.

No problems were encountered in the present study and the method may be useful in examination of digestion and absorption of sugars in infants.