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Biomedical subjects

L Sjödin

Publications and source records attributed to L Sjödin.

51 records · Page 3Linked to original sources
PubMed1977

Effect of resection of antrum and duodenal bulb on sham-feeding-induced inhibition of canine gastric secretion.

In dogs with Heidenhain pouches and oesophageal and gastric fistulae, sham feeding inhibited pentagastrin-stimulated Heidenhain pouch acid output. Resection of the antrum and the duodenalbulb reduced oin stomach was diverted through the gastric cannula. The present results are conid secretion at least partly by inducing a vagal release of an inhibitory hormone. The results suggest that this hormone is released from the antrum and the duodenal bulb.

Animals↗
PubMed1976

Modification of the gastric secretory response to sham feeding by acidification of the antrum and the duodenum in dogs.

The effect of closure of a gastric cannula on the acid response to sham feeding was studied in Pavlov-pouch dogs with intact antro-duodenal regions as well as in antrectomized dogs with gastroduodenostomies. In the latter dogs, the sham feeding response was augmented by infusions of low doses of exogenous gastrin. The acid output after sham feeding in intact dogs was reduced on average by 59% by closure of the gastric cannula. In antrectomized dogs receiving a back-ground stimulation with gastrin, the response to ham feeding was not inhibited by closure of the cannula. The results suggest that the observed hypersecretory response to sham feeding after diversion of gastric acid from antrum and duodenum is mainly due to inactivation of antral inhibitory mechanisms. The pepsin secretion following sham feeding was not consistently changed by closure of the gastric cannula.

Animals↗
PubMed1976

Metiamide inhibits canine gastric acid secretion evoked by sham feeding.

A continuous intravenous infusion of metiamide markedly inhibited the gastric acid secretory response to sham feeding in two dogs provided with Pavlov pouches and gastric fistulae. The results show that an antagonist of histamine H2-receptors is capable of inhibiting a vagally activated secretion evoked by sham feeding, which may be considered a physiological vagal stimulus.

Animals↗
PubMed1975

Gastric acid responses to graded vagal stimulation in the anaesthetized cat.

Graded acid secretory responses were obtained in anesthetized cats with intact pyloric region when the frequency of electrical stimulation of the neck vagi was increased from 0.5 to 8 Hz; 4-8 Hz induced maximal acid secretion. Antrectomy reduced the response to vagal stimulation but the reduction reached statistical significance only after additional resection of the duodenum. Administration of per se subthereshold or threshold doses of exogenous gastrin restored the acid response to vagal stimulation in antrectomized cats. Combination of a high dose of histamine and vagal stimulation in antrectomized output in anaesthetized cats which roughly amounted to two thirds of the reported maximal acid secretory rate during histamine stimulation in non-anaesthetized cats. The present results suggest that the physiological vagal discharge rate to the acid secreting glands does not reach higher frequencies than aroung 8 Hz. It is also suggested that an intact antroduodenal region is essential for acid responses to physiological vagal stimulation in the cat. Finally, the reduced sensitivity to gastric secretory stimulants under anaesthesia appears to be due in part to a reduced vagal tonus.

Animals↗
PubMed1975

Inhibition of gastrin-stimulated canine acid secretion by sham-feeding.

In dogs with a Heidenhain pouch and oesophageal and gastric fistulae, sham feeding inhibited pentagastrin-stimulated Heidenhain pouch acid output. When secretion was stimulated with a combination of pentagastrin and betanechol chloride, the inhibitory effect of sham feeding was less pronounced. Histamine-stimulated secretion was not inhibited by sham feeding. The inhibitory effect was not affected by extragastric abdominal vagotomy but was reduced or abolished by truncal vagotomy. The results are consistent with the hypothesis that vagal activity releases a hormone which has an inhibitory action on gastric acid secretion.

Animals↗
PubMed1975

Role of antrum and duodenum in the control of postprandial gastric acid secretion and plasma gastrin concentration in dogs.

Three dogs were provided with Pavlov pouches. In two subsequent operations the antrum and the duodenal bulb were removed and the gastrointestinal continuity was restored by gastroduodenostomy. Gastric acid and gastrin secretion were stimulated by a test meal. The feeding experiments were repeated after each operation. The gastrin response to a test meal was markedly reduced but not eliminated by antral resection. Additional removal of the duodenal bulb significantly lowered the basal plasma gastrin concentration and abolished the gastrin response to feeding. The acid response to test meals was significantly increased by antrectomy. Extirpation of the duodenal bulb reduced the postprandial acid output to or below preantrectomy levels. The findings indicate that the antrobulbar region exerts a complex influence on gastric acid secretion which may result in stimulation or inhibition of the HCl glands. Removal of the pyloric antrum and the duodenal bulb does not effectively reduce postprandial acid secretion.

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