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  • 11
    ISSN: 1432-0428
    Keywords: Exercise ; tritiated insulin ; subcutaneous insulin injections ; exercise-induced hypoglycaemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Previous studies in man and pancreatectomized dogs have indicated that alterations of the pharmacokinetics of subcutaneously injected insulin during physical activity may contribute to exercise-induced hypoglycaemia in insulin-treated diabetic patients. We have directly measured the appearance of subcutaneously injected insulin in the circulation and assessed its distribution to different tissues using a recently developed semisynthetic homogeneous [3H]insulin as a tracer. Following subcutaneous injection in rats of [3H]insulin in amounts insufficient to exert significant biological activity in intact animals, circulating levels of exogenous insulin were measured as plasma radioactivity co-migrating with insulin during gel filtration chromatography. Strenuous treadmill running accelerated the mobilization of subcutaneously injected [3H] insulin and resulted in a significant elevation of circulating levels of exogenous insulin early during exercise, followed by decreased levels in the post-exercise period. In addition, exercise induced a redistribution of 3H radioactivity in tissues, mainly increasing that found in skeletal muscle. This direct demonstration of altered pharmacokinetics of subcutaneously injected insulin during exercise provides, at least in part, a mechanism for the exercise-induced hypoglycemia seen following insulin injections in animals and during insulin treatment in man.
    Type of Medium: Electronic Resource
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  • 12
    ISSN: 1432-0428
    Keywords: Insulin-dependent diabetes mellitus ; Ca2+ ; glucagon release ; calcitonin release ; insulin release
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of Ca2+ and calcitonin infusions on circulating glucagon, glucose, C-peptide, Ca2+, and calcitonin were investigated in hyperglucagonaemic insulin-dependent diabetics. In 14 insulin-deprived diabetics and 12 healthy volunteers 2 h infusions of saline (0.154 mol/l), Ca2+ (0.375 mmol/kg body weight), and calcitonin (4.5 IU/kg body weight) were performed. There were no significant changes during saline infusion. In the diabetics, Ca2+ infusions induced a rise of plasma Ca2+ up to 3.2±0.1 mmol/l and a fall of circulating glucagon (-26.4±5.7%; p〈0.001) and glucose (-23.3 ±3.6%; p〈0.05). Plasma calcitonin rose to twice basal values (p〈0.025). During calcitonin infusions plasma Ca2+ decreased slightly to 2.1±0.2 mmol/l; a fall was found in both glucose (— 24.4±4.0%; p〈0.05) and circulating glucagon (-22.5±4.3%; p〈0.001). Two groups of 6 healthy volunteers were subjected to saline and Ca2+, or to Ca2+ and calcitonin infusions. Both Ca2+ and calcitonin infusions induced a fall of serum insulin (— 30.1±6.6%; p〈 0.05). Calcitonin depressed circulating glucagon by-18.6±4.4% (p〈0.025), whereas during Ca2+ infusions glucagon decreased only by -6.5±1.9% (p〉0.1). We conclude from our results that an increase of circulating calcitonin induced by Ca2+ infusions or by exogenous calcitonin administration appears to depress elevated circulating glucagon and glucose in insulin-dependent diabetics.
    Type of Medium: Electronic Resource
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  • 13
    ISSN: 1432-0428
    Keywords: Physical training ; obesity ; diabetes ; hypertriglyceridaemia ; glucose intolerance ; Zucker rat ; insulin resistance ; perfused hindquarter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of treadmill training on intravenous glucose tolerance and insulin sensitivity was investigated in Zucker rats (fafa). In 25-week-old fafa animals with the typical metabolic syndrome of massive obesity, glucose intolerance, hypertriglyceridaemia and insulin resistance, treadmill exercise of only very mild intensity was carried out for 6 weeks. The training programme induced a marked reduction in basal and post-glucose challenge plasma insulin levels and a slight but significant improvement of intravenous glucose tolerance. No alteration in insulin sensitivity of the isolated perfused hindquarter was demonstrable. In another study a 9-week training programme was started in 7-week-old fafa rats before the development of their metabolic syndrome. In the sedentary control animals glucose intolerance and insulin resistance developed during the study period; in the training group, both the deterioration of glucose tolerance and the decrease of insulin sensitivity were prevented. This study demonstrates in fafa rats that (a) in young animals physical training may prevent a genetically predisposed deterioration of glucose tolerance and insulin sensitivity and (b) in adult animals mild physical training may improve intravenous glucose tolerance and insulin sensitivity.
    Type of Medium: Electronic Resource
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  • 14
    ISSN: 1432-0428
    Keywords: Hypertension ; hyperinsulinaemia ; insulinoma ; insulin resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We have investigated the hypothesis that insulin is a causal and independent risk factor for blood pressure elevation in humans by comparing pre- and post-operative blood pressure values of 34 consecutive patients with histologically-confirmed diagnosis of insulinoma and 34 age- and sex-matched control patients. In patients with insulinoma hypoglycaemic symptoms were present for 18 (9–36) months. (Values are given as median and 95% confidence interval or mean and SD). After removal of insulinoma fasting plasma insulin levels decreased from 22 (16–28) mU/l to 11 (6–20) mU/l (p〈0.003) and minimal fasting plasma glucose concentrations increased from 2.5 (2.0–3.0) to 4.4 (4.2–5.7) mmol/l (p〈0.002) while blood pressure values remained unchanged. Body mass index before operation was comparable between the groups: 25.5 (5.4) kg/m2 in insulinoma patients and 24.8 (4.7) kg/m2 in control subjects. Pre-operative and post-operative blood pressure values did not differ between the groups, being (systolic/diastolic) 133 (18)/82 (9) mm Hg in insulinoma patients and 128 (15)/78 (10) mm Hg in control subjects before and 129 (19)/80 (10) mm Hg and 125 (11)/76 (7) after surgery. Chronic hyperinsulinaemia in patients with insulinoma is not associated with a detectable elevation of blood pressure values. Correction of hyperinsulinaemia after surgery for insulinoma does not result in blood pressure changes. These results argue against the hypothesis that insulin is an independent causal factor in the development of essential hypertension in humans.
    Type of Medium: Electronic Resource
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  • 15
    ISSN: 1432-0428
    Keywords: Exercise ; Type 1 (insulin-dependent) diabetes ; CSII ; hypoglycaemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The study was performed to investigate the effects of mild to moderate exercise on blood glucose levels, metabolite concentrations and responses of counterregulatory hormones in tightly controlled Type 1 (insulin-dependent) diabetic patients treated by continuous subcutaneous insulin infusion, and to quantify the measures necessary to prevent acute and late exercise-induced hypoglycaemia. Seven male patients started a 60 min exercise period 90 min after an insulin bolus and a standard breakfast; they were monitored during a post-exercise resting period of 5 h 30 min. Different basal and premeal insulin infusion rates were applied. (Near)normoglycaemia prevailed throughout the study during the control protocol when the subjects did not exercise and received their usual insulin dose. When they exercised without changing the insulin dose, four patients were forced to stop due to hypoglycaemia. This effect of exercise could be attenuated but not completely avoided if the basal infusion rate of insulin was discontinued during the exercise period. The pronounced increase in catecholamine and growth hormone concentrations during exercise were not sufficient to prevent hypoglycaemic reactions. Hypoglycaemia during exercise could only be prevented when the premeal insulin bolus was reduced by 50% in addition to the discontinuation of the basal insulin infusion during exercise. In order to reduce late hypoglycaemic reactions after exercise the best measure proved to be a reduction of the basal insulin infusion rate by 25% during post-exercise hours. Administration of only 50% of the basal insulin infusion rate during this time was associated with blood glucose levels being raised up to 8 mmol/l. In conclusion, Type 1 diabetic patients treated with continuous subcutaneous insulin infusion at (near)normoglycaemia need to reduce their insulin dosage before, during, and after mild to moderate endurance exercise in order to minimize the risk of acute and late hypoglycaemia.
    Type of Medium: Electronic Resource
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  • 16
    ISSN: 1432-0428
    Keywords: Insulin therapy ; education ; hypoglycaemia ; ketoacidosis ; hospitalisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Up to now all published experience with intensified insulin therapy has originated from specialized diabetes centres. However, even in diabetes centres and under research conditions intensification of insulin therapy may substantially increase the risk of severe hypoglycaemia. The aim of the present study was to demonstrate the feasibility of effectively and safely transfering intensified insulin therapy based upon a 5-day in-patient treatment and teaching programme from a University diabetes centre to non-specialized general hospitals. A total of nine general hospitals were recruited; the University diabetes centre served as a reference centre. From each general hospital a nurse and a dietitian were trained as diabetes educators, and a diabetes unit with about 10 beds was organized within each department of internal medicine. A total of 697 consecutively admitted Type 1 (insulin-dependent) diabetic patients (age 26±7 years, duration of diabetes 8±7 years) who participated in the programme either in one of the general hospitals (n=579) or in the reference centre (n=118) were re-examined after 1, 2 and 3 years. Insulin therapy was intensified to a similar extent in the reference centre and the general hospitals: at the 3-year follow-up about 80% of the patients injected insulin at least three times daily or used continuous subcutaneous insulin infusion (10%), and about 70% reported measuring blood glucose levels more than twice per day. HbA1 levels were lowered (p〈0.0001) to comparable levels, i. e. from 10.6 % (reference centre) and 9.9 % (general hospital), respectively, at baseline to 9.4 % and 9.3 %, respectively, at the 3-year follow-up. The yearly incidence rates of severe hypoglycaemia decreased from 0.23 (reference centre) and 0.29 (general hospitals), respectively, during the year before intensification of insulin therapy, to 0.19 (NS) and 0.12 (p〈0.005), respectively, during the third year of follow-up. Days spent in hospital were reduced in both groups (from 11 and 7 days per patient per year, respectively, to 5 and 4 days, respectively, p〈0.0001). In conclusion, this study shows that intensified insulin therapy based upon a structured and comprehensive training of the patients by diabetes educators can be effectively and safely translated from a specialized University diabetes centre to general medicine departments.
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 38 (1995), S. 53-56 
    ISSN: 1432-0428
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 18
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 40 (1997), S. B89 
    ISSN: 1432-0428
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 19
    ISSN: 1432-0428
    Keywords: Keywords Type I (insulin-dependent) diabetes ; quality of care ; diabetes education ; late complications ; HbA1c ; hypoglycaemia ; diet ; cardiovascular complications ; quality of life.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The objective of this study was to assess the degree of diabetes care and education achieved for Type I (insulin-dependent) diabetes mellitus at the community level in relation to social status and to elucidate potential pathways that mediate any social class gradient. A population-based sample of 684 adults with Type I diabetes (41 % women, mean ± SD age 36 ± 11, diabetes duration 18 ± 11 years) in the district of North-Rhine (9.5 million inhabitants), Germany, were examined in their homes using a mobile ambulance. Results: HbA1c (normal 4.3–6.1 %) 8.0 ± 1.5 %, incidence of severe hypoglycaemia (injection of glucose or glucagon) 0.21 cases per patient-year; 62 % of patients had participated in a structured group treatment and teaching programme for intensification of insulin therapy; 70 % used 3 or more insulin injections per day, 9 % were on continuous subcutaneous insulin infusion; 91 % reported to have had measurements of HbA1c during the preceding year, and 80 % to have had an examination of the retina by an ophthalmologist. Care was insufficient with respect to the quality of blood pressure control (70 % of patients on antihypertensive drugs had blood pressure values ≥ 160/95 mmHg), patient awareness of proteinuria/albuminuria (27 % of patients had not heard about it) and prevention of foot complications (only 42 % with a diabetes duration over 10 years had remembered to have a foot examination during the preceding 12 months). There was a pronounced social gradient with respect to micro- and macrovascular complications (prevalence of overt nephropathy 7 vs 20 % for highest vs lowest quintiles of social class [OR 3.5, 95 % CI 1.6–7.5, p = 0.002]) and diabetes-specific quality of life. HbA1c, blood pressure and smoking accounted for part of the association between social class and microvascular complications. The social class gradient was not due to inequality to access to health services, but to lower acceptance among low social class patients of preventive and health maintaining behaviour. In conclusion, achieved standards of care are high with respect to the implementation of intensified treatment regimens, the level of patient education achieved, treatment control and eye care, whereas areas for improvement are blood pressure control and preventive measures for foot care. A substantial social gradient in diabetes care persists despite equal access of patients to health services. [Diabetologia (1998) 41: 1139–1150]
    Type of Medium: Electronic Resource
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  • 20
    ISSN: 1432-0428
    Keywords: Key words Insulin therapy, diabetes education, hypoglycaemia, ketoacidosis, hospitalisation, blood glucose monitoring, urine glucose monitoring, cost-benefit-analysis.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In a prospective controlled trial the effects of a 5-day in-patient treatment and teaching programme for Type 1 (insulin-dependent) diabetes mellitus on metabolic control and health care costs were studied in Moscow. Two different intervention programmes were compared, one based upon urine glucose self-monitoring (UGSM, n =61) and one using blood glucose self-monitoring (BGSM, n =60). Follow-up was 2 years. A control group (n =60) continued the standard treatment of the Moscow diabetes centre and was followed-up for 1 year. Costs and benefits with respect to hospitalizations and lost productivity (according to average wage) were measured in November 1992 roubles (Rb.), with respect to imported drugs and test strips in 1992 German marks (DM). In the intervention groups there were significant decreases of HbA1 values [UGSM: 12.5 % before, 9.4 % after 1 year, 9.2 % after 2 years (p〈0.0001); BGSM: 12.6 % before, 9.3 % after 1 year, 9.2 % after 2 years (p〈0.0001) compared to no change in the control group (12.2 % before, 12,3 % after 1 year)], and of the frequency of ketoacidosis. The frequency of severe hypoglycaemia was comparable between the UGSM (10 cases during 2 years), BGSM (10 cases during 2 years), and the control group (8 cases during 1 year). In the combined intervention groups, there were significant decreases of hospital days per patient per year (12.1 during the year before, 1.0 year one after, 3.6 year two after, p〈0.005), and of additional sick leave days (16.6 during the year before, 2.4 year one, 7.8 year two after, p〈0.01), whereas these parameters remained unchanged in the control group. The initial costs of the intervention were outweighed by this subsequent reduction in hospitalizations and lost productivity. Net savings totalled up to 14 400 Rb./patient within 2 years. Patients of the intervention groups were told to discontinue drugs which were not indicated and/or ineffective (clofibrate, pentoxifylline, calcium dobesilate). This caused estimated average savings of DM 240 per patient per year. Costs of test strips for UGSM were DM 180 per patient per year; for BGSM they were estimated to lie between DM 370 and DM 550 per patient per year, depending on the frequency of measurements. In conclusion, the intervention led to an improvement of metabolic control and saved resources for health care by reducing hospitalizations and sick leave days. When UGSM is used, costs of test strips are approximately outweighed by discontinuing ineffective drugs. [Diabetologia (1994) 37: 170–176]
    Type of Medium: Electronic Resource
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