Search results for "Sodium"

In vivo hypotensive activity ofPistacia lentiscus L

1988

The present studies were undertaken to explain the mechanism of action of the hypothesive effect of Pistacia lentiscus L. aqueous extract. The potassium, calcium and magnesium content of the aqueous extract was determined and synthetic mixtures of salts evaluated in rats. The urinary excretion volume and the sodium and potassium concentrations in urine were also determined. In an effort to explain the effects of the extract, in vivo pharmacological experiments were conducted.

Efecto in vitro de la adición de resinas de intercambio iónico sobre la biodisponibilidad de electrolitos en fórmulas de nutrición enteral artificial

2008

The in vitro effect of the addition of ion exchange resins on the bioavailability of electrolytes in artificial enteral feeding formulas Objective: To determine in vitro free ion concentration in three standard artificial enteral feeding formulas following the addition of ion exchange resins. Method: Three standard types of AEF were chosen: Osmolite HN®, Nutrison Standard® and Isosource Standard®. The ion exchange resins used were: Sodium Polystyrene Sulfonate and Calcium Polystyrene Sulfonate. 100 ml of AEF were mixed in a beaker with 1.5 g or 3 g of ion exchange resins for 48 hours at 37oC. Subsequently, the samples were precipitated and the supernatant obtained was used for determining t…

Die diuretische Wirkung von Oxytocin beim Hund

1959

The influence of a synthetic oxytocin preparation and of prednisolone hemisuccinate on the renal excretions of water, sodium, potassium and chloride and on the clearance of endogenous true creatinine was studied in 18 dogs anesthetized with hexobarbital and barbital. The animals were deprived of food and water for 12 hours before the experiments.

Intestinal transport in constipation and diarrhoea.

1988

Approximatively 10 liters of fluid enter the gastrointestinal tract with food and endogenous secretions, and only less than 100 ml or 1% leave it with the faeces. Minor changes of this equilibrium in the intestinal transport may cause diarrhoea or constipation. Functions of small and large intestine differ markedly in transport of electrolytes and water. The relatively leaky epithelium of the small intestine allows for rapid equilibrium of osmolality in both directions while the tight epithelium of the colon preserves electrolytes and water once they have been absorbed. It may compensate secretory diarrhoea of the small intestine for instance caused by bacterial toxins to a certain degree u…

Neurogenic contraction and relaxation of human penile deep dorsal vein

1998

The aim of the present study was to characterize neurogenic and pharmacological responses of human penile deep dorsal vein and to determine whether the responses are mediated by nitric oxide from neural or endothelial origin. Ring segments of human penile deep dorsal vein were obtained from 22 multiorgan donors during procurement of organs for transplantation. The rings were suspended in organ bath chambers for isometric recording of tension. We then studied the contractile and relaxant responses to electrical field stimulation and to vasoactive agents. Electrical field stimulation (0.5–2 Hz) and noradrenaline (3×10−10–3×10−5M) caused frequency- and concentration-dependent contractions that…

Ausscheidung und Verteilung von Wasser und Mineralien nach oralen Gaben von physiologischer NaCl-L�sung bei der Ratte

1958

Die Wirkung von Ouabain auf die Elimination von Noradrenalin aus der Perfusionsfl�ssigkeit des isolierten Kaninchenherzens

1966

Isolated rabbit hearts were perfused with Tyrode solution containing 10 ng/ml (-)-noradrenaline for 20 min. The uptake by the heart of noradrenaline was calculated by estimating the percentage of amine removed from the perfusion fluid during a single passage through the heart. Previous experiments have shown that the amount of noradrenaline removed from the perfusion fluid corresponds well to the amount retained by the heart. In control experiments, the mean removal (elimination) of noradrenaline was 50±1.7% of the amount infused as measured biologically and 46±2.2% as measured fluorimetrically. Ouabain was added to the perfusion fluid at concentrations ranging from 2.74·10−7 to 2.0·10−6 mo…

Influence of intracellular sodium concentration on calcium influx in isolated guinea pig auricles.

1969

Red blood cell sodium and potassium after hydrochlorothiazide.

1981

In six of seven healthy males 6 days of hydrochlorothiazide (HCT), 50 mg twice daily, without potassium supplements resulted in a rise in red blood cell (RBC) sodium concentration. Serum potassium concentration fell in all subjects. Four days after discontinuing HCT, intracellular sodium and extracellular potassium concentrations had normalized. Throughout the evaluation period the course of mean relative intracellular sodium was almost a mirror image of mean relative extracellular potassium. Thus, either the decline of serum potassium or of HCT (because of its inhibitory effect on Na-K-ATPase activity) might have diminished Na-K-ATPase–dependent active RBC sodium efflux with a resultant ri…

Estabilidad en suero fisiológico del busulfán intravenoso en un envase de poliolefinas

2008

Introduction: Although it has been used orally, the variability in its absorption and the risk of causing vomiting has lead to a push towards the intravenous use of bulsulfan. This study looks at the stability of 60 mg of busulfan, in fixed volumes of 250 mL (0.24 mg/mL) and 500 mL (0.12 mg/mL) of serum and different conservation conditions, in a new plastic pack made from polyolefin/polyamide laminates. Material and methods: High-efficiency liquid chromatography with ultraviolet detection was used to determine the concentration of busulfan derivate with sodium diethyldithiocarbamatetrihydrate. Stability was assessed for both concentrations; refrigerated and at room temperature, using the t…