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Query: UMLS:C0011849 (diabetes)
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In alloxan-treated diabetic rats, plasma renin activity (PRA) is decreased. One possible mechanism that may explain the decreased PRA is an increased delivery of sodium to the macula densa produced by the glucose osmotic diuresis, resulting in decreased renin release. To evaluate this possible mechanism, rats with phlorhizin diabetes, which produces a glucose osmotic diuresis without hyperglycemia, were studied and compared with rats with alloxan-induced diabetes. Whereas phlorhizin-treated rats had low blood glucose and alloxan-treated rats had elevated glucose, the glucose osmotic diuresis was similar in the two groups. PRA and plasma renin concentration (PRC) were significantly increased in the phlorhizin group. In the alloxan group, PRA was decreased and angiotensin II sensitivity increased, both significantly. Plasma renin substrate (PRS) remained adequate in each group. These results suggest that the decreased PRA in alloxan-induced diabetes is due neither to factors associated with the glucose osmotic diuresis including changes in renal tubular sodium not to decreased PRS.
Diabetes 1979 Feb
PMID:Renin-angiotensin system in phlorhizin compared with alloxan diabetes in the rat. 42 68

The intravenous injection of zinc or manganese chloride immediately before and 15 minutes after alloxan or dithizone prevented the usual hyperglycemia observed 24 hours after induction of diabetes. Injection of zinc chloride in alloxan diabetes led to normalization of sodium while zinc, copper, iron and magnesium remained high and calcium and potassium remained low as in alloxan. In case of dithizone diabetes, the administration of zinc salt led to an increase in serum zinc, magnesium and potassium and to a decrease in serum calcium while the sodium level returned to normal. Manganese plus alloxan led to a normalization of serum zinc, copper, potassium and sodium. In the case of dithizone plus manganese only magnesium was raised while the other elements were unchanged when compared to animals injected with dithizone only. Chromium and cobalt lowered the blood glucose to a certain extent however it did not affect most of the elements. The same changes occurred in all elements as with alloxan or dithizone alone. Pretreatment with ATP led to a normalization of serum zinc, copper, magnesium, sodium and potassium, while in case of iron it remained high and calcium remained low as that found in alloxan diabetic rats.
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PMID:Serum mineral changes due to exogenous ATP and certain trace elements in experimental diabetes. 44 5

In a prospective study of abnormalities of plasma sodium concentration carried out over one year 20 patients were identified who had a concentration exceeding 154 mmol(mEq)/1. Of these, eight patients had diabetes mellitus, eight had primary intracranial disorder, and four had become dehydrated. Five of the eight diabetics presented with hyperosmolar, non-ketotic precoma, and in all eight hypernatraemia developed despite treatment with hypotonic (0.45%) saline. There was a good correlation (r = -0.93) between the rates of change of plasma sodium and blood glucose concentrations, and thus a rise in plasma sodium concentration appeared to be a consequence of the treatment. In the early phase of treatment urinary sodium loss was extremely low despite a brisk diuresis, the infused sodium then predisposing the patients to hypernatraemia. All of the eight patients with intracranial disorders showed evidence of abnormal production of the antidiuretic hormone, six having frank diabetes insipidus. Severe hypernatraemia in this group was associated with a high mortality, fluid balance being difficult to maintain. Two of the four patients who had become dehydrated had had a recent gastrointestinal haemorrhage. In these patients infusion of 0.9% saline contributed to the hypernatraemia since urinary sodium loss was low. Severe hypernatraemia in adults is uncommon, but in established cases plasma and urinary biochemical indices should be measured frequently. Monitoring of the central venous pressure is usually necessary, and patients are best managed in an intensive care unit.
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PMID:Severe hypernatraemia in adults. 44 98

The effect of a chronic glucose osmotic diuresis on electrolyte homeostasis was evaluated in alloxan diabetic rats with urine volumes greater than 150 ml/day and glycosuria of 4 to 10 gm/day. Results were compared with control rats for periods up to 84 days. Sodium and potassium intake and urinary losses were significantly higher in diabetic animals throughout the study periods. Negative Na balance, however, persisted for only four days, and negative K balance for only 18 days. Blood volumes were elevated probably secondary to the osmotic effect of hyperglycemia (serum glucose greater than 600 mg %). Plasma renin activity decreased progressively, in part because of an early decrease in renin substrate at a time when renin concentration was normal. Despite hyperkalemia, mean plasma aldosterone was not increased compared with that in control rats, suggesting diabetic rats had relative hypoaldosteronism. Although three diabetic rats became hypertensive, no significant difference in mean blood pressure was observed between the groups. The results suggest that diabetic rats have losses of Na and K early in their diabetes, following which mechanisms to conserve Na and K are activated preventing further electrolyte depletion despite continuation of the osmotic diuresis. Decreased renin activity with inadequate stimulation of aldosterone would contribute to K conservation. Maintenance of Na balance must be explained by increased Na intake and other renal Na conserving mechanisms.
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PMID:Renin-angiotensin-aldosterone system, electrolyte homeostasis and blood pressure in alloxan diabetes. 45 34

Although human need for various nutrients is well-established, the exact requirements for the different nutrients are not well-known. Nutrient requirements are affected by genetics; environment; nature of the diet; and hemeostatic demands under changing physiological conditions expressed as growth, reproduction and response to the stress of injury or disease. Pregnant and lactating women should be properly nourished if well-nourished infants are desired. Nutrient and energy needs are considerably increased during pregnancy and lactation. The most rapid growth of infants occurs during the 1st 4 to 6 months of life. Because of the many advantages of breast milk over artificial milk, full-term newborn infants should be breastfed, unless there are specific contraindications or breastfeeding is unsuccessful. The American Medical Association (AMA) urges that better efforts be made to educate the public and the medical profession as to the advantages of breastfeeding. The 4th to the 6th months of life constitute the transitional period in infant feeding. The baby should be introduced to single-ingredient foods in small quantities, one at a time, to isolate food sensitivities. Good eating habits can be formed early in life through the proper and gradual introduction of varied and nutritional meal patterns. Energy balance is a nutritional problem in late childhood and once maturity is achieved, while calorically and nutritionally inadequate diets are a growing concern for the elderly. Immoderate eating habits (e.g., overeating) may aggravate or contribute to the development of degenerative diseases and should be discouraged. The AMA recommends that the American public focus on the achievement and maintenance of the most desirable body weight through a proper combination of dietary control and exercise. Specific dietary modifications (sodium restriction, weight control) are necessary in the management of hypertension, diabetes, coronary heart diseases and other medical problems. The medical profession should assume a more active role in teaching people how to achieve and maintain good health habits through behavioral modification.
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PMID:American Medical Association concepts of nutrition and health. Council on Scientific Affairs. 49 Aug 37

Experimental diabetes was produced in 59 rats by intravenous injection of streptozotocin, and the rats were studied from 9 days to 4 months later. Experimental pancreatitis was produced in 28 rats by injecting sodium taurocholate, 3% or 6% solution in saline, into the pancreatic duct. These rats were studied with microangiography from 2 h to 4 days later. Experimental diabetes caused atrophy of the islets of Langerhans but did not cause any changes in the vessels of the exocrine pancreas, liver, or kidney up to 4 months. Capillary filling of the young, long-term diabetic rats was poor in all the examined organs, and the muscle arterioles showed variation of caliber. A 3% sodium taurocholate solution produced mild pancreatitis and little or no changes in the vasculature, whereas a 6% solution caused severe hemorrhagic pancreatitis with local extravasations and poor capillary filling. It is concluded that diagnostically useful vascular changes appear in the pancreas only if severe pancreatitis is present.
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PMID:The effect of experimental pancreatitis and diabetes on the microvasculature of the rat pancreas. 53 1

Estimation of plasma glucose in home blood samples is needed to improve diabetic control. Sufficiently precise measurements on capillary blood were obtained by (a) storing Reflotest glucose-oxidase strips in a desiccant container before reading and (b) collecting blood samples into a simple vacuum bottle containing potassium fluoride (assay of sodium content indicating volume of plasma collected). The precision of the methods (+/- 1 SD) was +/-0.35 mmol/1 (+/-6.3 mg/100 ml). Clinical reliability was assessed by measuring the basal plasma glucose concentration at home on different mornings in patients with maturity-onset diabetes, the day-to-day variation (+/- 1 SD) being +/-0.73 and +/-0.92 mmol/1 (+/-13.2 and +/-16.6 mg/100 ml) respectively. The mean basal plasma glucose concentration in all 84 patients with maturity-onset diabetes from three general practices was 8 mmol/1 (144 mg/100 ml), 44 of the values exceeding 6 mmol/1 (108 mg/100 ml). Improving control by monitoring the basal plasma glucose concentration in maturity-onset diabetes might help to prevent diabetic complications.
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PMID:Home blood sampling for plasma glucose assay in control of diabetes. 56 13

A 64-year-old woman with diabetes mellitus as well as hypertensive retinopathy developed an acute myocardial infarction and hypertensive crisis following the injection of 5 ml. of 10 per cent sodium fluorescein for fundus angiography. This is the first time this complication has been documented. Possible mechanisms for such an occurrence are discussed. Recommendations for recognizing and dealing with patients at high risk for cardiovascular complications of fluorescein angiography are emphasized.
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PMID:Acute myocardial infarction following fluorescein angiography. 58 85

In fed, unanesthetized rabbits, regular zinc insulin, 50 U./kg. intravenously, decreased plasma glucose levels 52 per cent, p = 0.002, 35 minutes after injection. In 15-hour-fasted, unanesthetized animals, the same dose of insulin decreased plasma glucose levels 68 per cent, p less than 0.001. Plasma K+ concentration was not affected by insulin injection in the fed animals; in fasted rabbits, plasma K+ levels fell 26 per cent, p = 0.006. Despite this unequivocal evidence of insulin action in both sets of animals, there was no change in the K+, Na+, or H2O content in the brains of the same animals 35 minutes after insulin injection. These results, which give no evidence of a direct effect of insulin on electrolyte transport in brain, are in sharp contrast with those found in anesthetized rabbits, which suggested that insulin affects brain potassium and water content before any change in plasma glucose occurs.
Diabetes 1977 Dec
PMID:Insulin and brain metabolism. Absence of direct action of insulin on K+ and Na+ transport in normal rabbit brain. 59 Jun 36

Experiments were carried out in an attempt to elucidate the mechanism of fasting-induced natriuresis in conscious rats. Female animals were given low sodium diet and saline in a fixed concentration for at least three days, and deprived of food thereafter. The sodium balance significantly shifted to negative independently of potassium supply in intact rats. Such was also observed in the dexamethasone-replaced, adrenalectomized rats and was not affected by further administration of aldosterone. In addition, the diuretic effect of insulin in fasted intact rats was not evident in the fed diabetic rats in which diabetes had been induced by streptozotocin. Such findings suggested participation of factors other than insulin. The natriuresis of fasting in intact rats appears to involve two factors, one of which is independent of the sodium intake level. Dependence on the sodium intake level may be derived from alteration of the solute diuresis-like effect of drinking saline w hen animals are fasted. These results suggest that neither aldosterone nor insulin is a major causal factor involved in fasting-induced natriuresis.
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PMID:Natriuresis of fasting in intact and adrenalectomized rats. 59 57


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