RESUMO
In eight volunteers the effect of pentagastrin (0.15, 1.0 and 6.0 microgram/kg body weight/h), secretin (0.5 and 1.0 clinical units/kg b.w./h), and cholecystokinin (CCK) (0.5 and 1.0 Ivy dog units/kg b.w./h) on the gastric secretion of pepsin was investigated to ascertain whether interaction occurred. A high intraindividual variation was found, and also a significant washout of pepsin in the initial period after stimulation. Pepsin secretion was stimulated after pentagastrin (50% above basal level) and even more after secretin (75%-200% above basal level), whereas no stimulation but a tendency for depression was seen after CCK. With the doses of gastrointestinal hormones used in this investigation, no interaction between secretin and CCK on gastric secretion of pepsin in man was demonstrated.
Assuntos
Colecistocinina/farmacologia , Mucosa Gástrica/metabolismo , Pentagastrina/farmacologia , Pepsina A/metabolismo , Secretina/farmacologia , Adulto , Feminino , Suco Gástrico/metabolismo , Mucosa Gástrica/enzimologia , Humanos , Masculino , Pessoa de Meia-Idade , Fatores de TempoRESUMO
For the elaboration of a formula estimating the reflux volume of duodenal secretion into the stomach, gastric and duodenal secretion have been studied during pentagastrin and secretin stimulation. In the stimulated gastric secretion the concentration of sodium varied with the secretion rate, whereas the concentration of chloride was nearly constant. The concentration of sodium in duodenal juice was constant, but the chloride concentration dropped significantly during secretin stimulation. Secretin induces duodenal reflux. When duodenal reflux occurs, a substantial amount of the sodium in gastric juice is attributable to intruding duodenal juice. The formula gives the duodenal reflux volume in 15-min samples on the basis of the sodium in gastric secretion and in the duodenal juice. A concentration of sodium in samples of gastric juice twice exceeding the concentration of sodium in maximally stimulated gastric secretion (8 +/- 2 mmol/l, mean +/- S.D.) may suggest 'contamination' of the samples with duodenal juice. The present formula allows for quantitative determination of this 'contamination.'
