Barostat
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Compliance and retal sensitivity during pre and post-operative of pacients with haemorrhoidal disease treated by stapled anopexy / Complacência e sensibilidade retal no pré e pós-operatório de pacientes com hemorróidas tratados por anopexia mecânica
O tratamento cirúrgico da doença hemorroidária pela Anopexia Mecânica (AM), utilizando grampeador circular PPH de 33mm (Ethicon EndoSurgery) pode estar relacionado a lesão esfincteriana perianal, com repercussão no padrão evacuatório. O objetivo deste estudo é avaliar a sensibilidade e complacência retal em pacientes submetidos a esta técnica oper
Publicado em: 2005
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2. Efeito da Hipertensão Intracraniana sobre a complacência Gástrica de ratos Anestesiados: Cauterização do Fenômeno e dos Mecanismos Neurais / Effect of the intracranial hypertension on gastric compliance of anaesthetized rats: characterization of the phenomenology and neural mechanisms
In humans, intracranial hypertension (ICH) disturbs cardiovascular function and also modifies gastrointestinal physiology as clinically manifested by nausea and vomiting symptoms. Since gastric compliance drives the gastric emptying of liquid which is inhibited by ICH, it was studied the ICH effect on gastric compliance behavior in anesthetized rats and the
Publicado em: 2004
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3. Variations in gastric compliance induced by acute blood volume changes in anesthetized rats
The impact of acute volume imbalances on gastric volume (GV) was studied in anesthetized rats (250-300 g). After cervical and femoral vessel cannulation, a balloon catheter was positioned in the proximal stomach. The opposite end of the catheter was connected to a barostat with an electronic sensor coupled to a plethysmometer. A standard ionic solution was u
Brazilian Journal of Medical and Biological Research. Publicado em: 2002-03
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4. Portable Device for Preparation and Delivery of Gas Mixtures †
A simple, portable device for the preparation and delivery of gas mixtures has been designed and constructed. The basic feature of the device is the use of gas flow controllers to maintain stable flow rates over a wide range of downstream pressures, instead of the capillary tubes and water-filled barostats commonly used in gas-mixing devices. Elimination of
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5. Intestinal Phospholipase, a Novel Enzyme
We evaluated phospholipase activity in the intestine of rats and other species. Phospholipase activity was assayed by a surface barostat technique or an egg yolk titration system. Mucosal activity was found only by the surface barostat technique with phosphatidylglycerol as substrate; it was not found with phosphatidylcholine as substrate in assays by either
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6. Pyloric motility and liquid gastric emptying during barostatic control of gastric pressure in pigs.
1. In conscious pigs, intragastric pressure was controlled by a water barostat such that the gastroduodenal pressure gradient was always positive with the barostat set above 15 cm. In six pigs pyloric motor function was removed by prior pylorectomy. 2. In pylorus-intact animals, isolated pyloric pressure waves (IPPWs) occurred at a median of 2.9 min-1 during
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7. Rectal wall contractility in healthy subjects and in patients with chronic severe constipation.
OBJECTIVE: The aim of this study was to identify differences in rectal wall contractility between healthy volunteers and patients with chronic severe constipation. SUMMARY BACKGROUND DATA: Whether motor function of the rectum contributes to slow-transit constipation is unknown. Measurements of rectal contractility have been performed traditionally with perfu
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8. Cholecystokinin in transient lower oesophageal sphincter relaxation due to gastric distension in humans.
BACKGROUND AND AIMS: Transient lower oesophageal sphincter relaxations (TLOSRs) has been found to be the main mechanism of gastro-oesophageal reflux. In dogs, cholecystokinin (CCK) is involved in their occurrence. The aim was to evaluate the role of endogenous and exogenous CCK in the occurrence of TLOSRs induced by gastric distension at constant pressure in
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9. Importance of vagal input in maintaining gastric tone in the dog.
1. Using a gastric barostat to quantify variations in gastric tone, we had previously demonstrated that food ingestion or intestinal nutrient perfusion induces gastric relaxation. These data suggested a basal tonic contraction of the stomach during fasting. 2. To determine the role of vagal input in maintaining fasting gastric tone, we prepared two chronic c
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10. Perception and gut reflexes induced by stimulation of gastrointestinal thermoreceptors in humans.
1. Experimental studies in animals suggest the existence of thermoreceptors in the gastrointestinal tract. Our aim was to investigate the distribution and specificity of upper gut thermoreceptors in humans. 2. In healthy subjects, thermal stimulation of the stomach (n = 8) and the small intestine (n = 6) was produced by means of a thermostat, which recircula
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11. Increased sensitivity of gastrin cells to gastric distension following antral denervation in the rat.
1. Secretion of the antral hormone gastrin is increased by protein in the gastric lumen and by nervous reflexes. We have examined the relative importance of luminal and neuronal mechanisms, by lesioning the antral innervation using benzalkonium chloride. 2. Benzalkonium chloride was applied to the serosa of the antrum in anaesthetized rats. In some animals,