Search PubMed⌕ Search

SEARCH · Search PubMed

Results for “Dependency Burden”

Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 73 records · Page 4Linked to original sources
PubMed2004

Blood burden of di(2-ethylhexyl) phthalate and its primary metabolite mono(2-ethylhexyl) phthalate in pregnant and nonpregnant rats and marmosets.

A comparison of the dose-dependent blood burden of di(2-ethylhexyl) phthalate (DEHP) and mono(2-ethylhexyl) phthalate (MEHP) in pregnant and nonpregnant rats and marmosets is presented. Sprague-Dawley rats and marmosets were treated orally with 30 or 500 mg DEHP/kg per day, nonpregnant animals on 7 (rats) and 29 (marmosets) consecutive days, pregnant animals on gestation days 14-19 (rats) and 96-124 (marmosets). In addition, rats received a single dose of 1000 mg DEHP/kg. Blood was collected up to 48 h after dosing. Concentrations of DEHP and MEHP in blood were determined by GC/MS. In rats, normalized areas under the concentration-time curves (AUCs) of DEHP were two orders of magnitude smaller than the normalized AUCs of the first metabolite MEHP. Metabolism of MEHP was saturable. Repeated DEHP treatment and pregnancy had only little influence on the normalized AUC of MEHP. In marmosets, most of MEHP concentration-time courses oscillated. Normalized AUCs of DEHP were at least one order of magnitude smaller than those of MEHP. In pregnant marmosets, normalized AUCs of MEHP were similar to those in nonpregnant animals with the exception that at 500 mg DEHP/kg per day, the normalized AUCs determined on gestation days 103, 117, and 124 were distinctly smaller. The maximum concentrations of MEHP in blood of marmosets were up to 7.5 times and the normalized AUCs up to 16 times lower than in rats receiving the same daily oral DEHP dose per kilogram of body weight. From this toxicokinetic comparison, DEHP can be expected to be several times less effective in the offspring of marmosets than in that of rats if the blood burden by MEHP in dams can be regarded as a dose surrogate for the MEHP burden in their fetuses.

Administration, Oral↗
PubMed1994

[Demographic aging in the member countries of the European Union].

"Despite all remaining political, economical and cultural differences in the member countries of the European Union...population ageing is a common phenomena of all these countries.... Many spheres of socio-economic life in the countries of the European Union are already affected by this shifting process.... Most of the social security and welfare systems of the industrialized countries in the European Union are mainly based on intergenerational solidarity, a solidarity which is highly burdened by the demographic development. In this respect policy makers have to take into consideration the expected changes in the age structure of the economically active population, changing patterns of labour force participation as well as changes in family and household structures in their task to modify existing systems or to build new systems of social security and welfare under the growing burden of an ageing society." (SUMMARY IN ENG)

Demography↗
PubMedDate not supplied

The growing burden of an ageing population?

The author asserts that the problems posed by demographic aging in developed countries have been overstated, noting instead that "the transition to an older population will be gradual enough to allow time to plan. The importance of the shift in the so-called 'dependency ratio' is exaggerated because 'dependency' is unsatisfactorily defined. Nor is there clear evidence that as more people live to be older health and social service costs will rise accordingly: people are remaining fit to later ages and there is strong evidence that they can continue to make a positive contribution to the economy as workers and as consumers until relatively late ages. Social services can also be redesigned to maximize the independence of the elderly while minimizing costs."

Adult↗
PubMed2000

Relative contributions of aqueous and dietary uptake of hydrophobic chemicals to the body burden in juvenile rainbow trout.

This study assessed the relative contributions of aqueous versus dietary uptake of three hydrophobic chemicals, 1,2, 4-trichlorobenzene (1,2,4-TCB), 1,2,3,4,5-pentachlorobenzene (PeCB), and 2,2',4,4',6,6'-hexachlorobiphenyl (HCBP). Juvenile rainbow trout (Oncorhynchus mykiss) were exposed separately to chemically spiked water and food for 4 days and 12 days, respectively. Chemical concentrations were measured in the food, water, and tissues, and this allowed calculation of uptake rate constants (k(1) from water exposure, k(d) from food exposure). The k(1) values for the three test chemicals were approximately five orders of magnitude greater than the k(d) values. Using these measured uptake rate constants, a simulation model was used to predict the relative aqueous versus dietary uptake when fish were exposed simultaneously to water and food contaminated with these hydrophobic chemicals. The model predicted for all three test chemicals that the two uptake routes would contribute equally to the chemical body burden in fish whenever the food:water chemical concentration ratio was near 10(5). However, using food:water chemical concentration ratios that might be expected in nature, the model predicted that gill uptake could account for over 98% of fish body burden for both 1,2,4-TCB and PeCB uptake (log K(ow) values of 3.98 and 5.03, respectively). For HCBP (log K(ow) of 7.55), the model predicted that the dietary uptake could contribute over 85% of the body burden. Thus, depending on the actual food:water chemical concentration ratio, aqueous uptake via the gills can predominate even when the chemicals have a log K(ow) value greater than 5.0. In addition, we confirmed that dietary uptake of hydrophobic xenobiotics increases with increasing log K(ow).

Algorithms↗
PubMed2004

Dose-dependent effects of chronic iron burden on heart aldehyde and acyloin production in mice.

Iron's chemical structure and its ability to initiate one-electron reactions are properties that cause it to play a major role in the production and metabolism of oxygen free radicals in biological systems. Oxygen free radicals are conjectured to cause cardiac failure in individuals afflicted with disorders of iron overload. We report on the use of both acyloins and aldehydes as markers of oxidative stress in a murine model of chronic iron-overload cardiomyopathy. Twenty mice were randomized to four treatment groups: (1) control (0.2 mL normal saline ip/mouse/d); (2) 100 mg iron (0.05 mL iron dextran/mouse/d); (3) 200 mg iron (0.1 mL iron dexxtran/mouse/d); (4) 400 mg iron (0.2 mL iron dextran/mouse/d). Significant dose-dependent increases in both total heart aldehyde and total heart acyloin concentrations were found. Furthermore, a significant positive correlation existed between the dose of iron administered and each quantified aldehyde and acyloin found in the heart.

Aldehydes↗
PubMed1990

Proposals for epidemiological surveys of helminthoses aimed at the improvement of livestock production in the tropics.

As the major contagious epidemics in the tropics are today more or less under control, the most important diseases of livestock are due to parasitic infections. Precise knowledge concerning the biology of parasites and their seasonality is a prerequisite for any control strategy. Therefore, epidemiological investigations into the effect of helminths on ruminant livestock production must include I. A vertical section through the age dependent helminthic burden of a representative number of animals of a given population, i.e. the sampling of faeces at regular intervals during the first 18 months of life. II. Investigations into the horizontal development of the helminthic situation, whether soil-transmitted and/or vector-transmitted. a. The seasonal fluctuation of egg excretion from gastrointestinal nematodes. b. The seasonal incidence of nematode larvae on pastures. c. The seasonal survival time of nematodes larvae on pastures. III. The seasonal fluctuation of vector snails and their incidence of infection with trematode larvae. For the economic evaluation of control measures it is necessary that the following parameters should be recorded: The age dependent mortality rate, the development of the average body weight, the birth/slaughter weight, the age at first calving and the calving intervals.

Age Factors↗
PubMed1999

The health care burden of unstable angina.

Worldwide, UA represents a significant allocation of resources. UA represents a syndrome where not only do many therapies exist, but considerable clinical trial evidence has accumulated. Universal application of effective practice patterns is warranted if we are to successfully reduce the burden of UA. Economic analyses cannot resolve many of the underlying societal issues that affect decision making. Often, the acceptability of an economic burden is dependent on the willingness of both individuals and society to pay. In an interesting study, Chestnut et al evaluated the willingness of 50 patients to pay for avoiding a worsening of their angina symptoms. On average, the patients were willing to pay between $210 and $499 to avoid four to eight additional angina episodes each month. The "rule of rescue" suggests that society is often willing to pay large sums of money to save those in extreme need, such as the 55-year-old man rushed to the emergency department clutching his chest. Only recently has attention been paid to how much this disease entity costs us. Whereas the 1980s and 1990s saw a focus on costs, the next century will increasingly focus on value--obtaining the best health outcome for the dollars spent. Debate has shifted, at least in part, from purely financial costs to medical effectiveness and outcomes management. Continuing assessments of value of interventions and application of evidence based-management strategies permit rational selection of therapy and allow us best to bear the burden of UA.

Angina, Unstable↗
PubMed1991

The marginal cost of public funds with an aging population.

"As populations in the United States and other advanced economies grow older, the burden of social security and health care financing is expected to rise markedly. Payroll, income, and other taxes on working populations are projected to rise accordingly. The marginal welfare cost to workers of social security and other public expenditures is analyzed within the context of a two-period life cycle model. By relaxing separability assumptions that have become common in the literature, the theoretical structure properly incorporates the effect of these public expenditures on labor supply. Comparative statics results indicate that changing age structure is likely to raise the marginal welfare to workers of social security, education, and other public expenditures. Illustrative calculations for the United States confirm this result, suggesting that the cost to workers of incremental social security benefits may easily double by 2025-2050."

Age Distribution↗
PubMed1988

The dependency ratio and optimum population growth. The total utility case.

"This paper examines the effects of introducing a variable dependency ratio in Dasgupta's (1969) model. We consider a case in which the probability of dying as well as the rate of participation in the labor force change with age. It is shown that the inclusion of those realistic demographic features slows down the optimal rate of population growth and increases the rate of consumption. In spite of the reduction in the rate of population growth, this rate can still be positive. The sensitivity of the solutions to changes in the demographic parameters of the model is examined."

Demography↗
PubMed1991

Public pensions in transition: an optimal policy path.

"The main purpose of this paper is to analyze problems of financing an old-age insurance when birth rates are low and population declines or fertility fluctuates with time....[The author] investigates a theoretical model which analyzes the welfare optimal combination of private savings via the capital market and the state forced savings via a PAYG [pay-as-you-go] financed public pension system. Long-run effects as well as short-run implications are considered. The economic properties of an optimal steady state are determined and additionally an optimal transition path--the best feasible conversion policy--which leads to the new steady state is specified."

Demography↗
PubMed2004

Death and dying from old people's point of view. A literature review.

Providing high-quality end-of-life care to older people is a requirement especially for countries with a high proportion of old and very old people. This calls for an understanding of older people's view of death and dying, and one way forward is to investigate the current knowledge base. This study aimed at reviewing the literature of empirical studies about older people's view of death and dying, whether in a terminal phase of life or not. A total of 33 publications were included, identified in a stepwise literature search done in Medline, CINAHL and PsychInfo, using the terms "death", "attitude to death", "death" and "dying" in combination with "aged". Very few studies focused solely on the oldest old. The designs were mainly cross-sectional, quantitative or qualitative, using personal interviews. Some common themes of importance for further research were revealed, such as older people's readiness to talk about death and dying, conceptions of death, after-death and dying, and were seemingly related to anxiety about death, the impact on and of those close by, having both negative and positive connotations, especially related to balancing closeness, being a burden and dependency, death anxiety and its possible antecedents, the fine line between natural sadness and suffering from depression, and worry about the end-of-life phase. The lack of studies dealing with older people's view of death and dying, and the heterogeneity with regard to research questions and samples implies that findings may serve mainly as inspiration for further research.

Aged↗