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Total ischemic burden: effect of vasoactive agents.

Treatment of the total ischemic burden is dependent on adequate documentation of both painful and painless episodes of myocardial ischemia, an understanding of the pathophysiologic mechanisms involved, and knowledge of prognosis for affected patients. Because a vasoconstrictive component appears to be an important element in the genesis of many episodes of myocardial ischemia, those vasoactive drugs that produce increased flow in the coronary circulation should be clinically useful. Nitrates and calcium blockers--especially nifedipine--have been found to be particularly valuable in this regard in both experimental and clinical trials.

Animals↗

Stochastic demographic forecasting.

"This paper describes a particular approach to stochastic population forecasting, which is implemented for the U.S.A. through 2065. Statistical time series methods are combined with demographic models to produce plausible long run forecasts of vital rates, with probability distributions. The resulting mortality forecasts imply gains in future life expectancy that are roughly twice as large as those forecast by the Office of the Social Security Actuary.... Resulting stochastic forecasts of the elderly population, elderly dependency ratios, and payroll tax rates for health, education and pensions are presented."

Adult↗

Lead retards development of Drosophila melanogaster.

1. Lead (Pb) is a ubiquitous environmental toxicant which has been reported to have growth-retarding effects. That premise was examined in the current study of the effects of developmental exposure to Pb on the maturation of the fruitfly Drosophila melanogaster. 2. Flies were raised from egg to adulthood in media to which 0, 100, 250, or 500 ppm Pb acetate added. 3. There was a dose-dependent delay of maturation but no apparent effect on survival to adulthood. There were no significant differences in this effect between male and female flies. 4. Weights of fly offspring and their fecundity were not related to increasing exposure levels, suggesting that the delays were not due to gross nutritional deficits. 5. Analyses of Pb content indicated exposure-dependent body burdens of Pb in flies. Timed analyses of the Pb content of media itself indicated a heterogeneous distribution of Pb in the media, suggesting some precipitation of Pb at the highest exposure, occurring primarily during the first hour. 6. The mechanistic bases of the Pb-induced retardation of D. melanogaster development remain unknown, but it is concluded that because of the extensive body of knowledge on D. melanogaster genetics, molecular biology, and developmental biology, this procedure could serve as a model system for further study of the developmental consequences of exposure to Pb or other toxicants. 7. Environmental Pb exposure resulting in retarded development could have deleterious repercussions for insect populations exposed chronically to high levels of Pb.

Animals↗

Metabolism of 1,3-butadiene to toxicologically relevant metabolites in single-exposed mice and rats.

1,3-Butadiene (BD) was carcinogenic in rodents. This effect is related to reactive metabolites such as 1,2-epoxy-3-butene (EB) and especially 1,2:3,4-diepoxybutane (DEB). A third mutagenic epoxide, 3,4-epoxy-1,2-butanediol (EBD), can be formed from DEB and from 3-butene-1,2-diol (B-diol), the hydrolysis product of EB. In BD exposed rodents, only blood concentrations of EB and DEB have been published. Direct determinations of EBD and B-diol in blood are missing. In order to investigate the BD-dependent blood burden by all of these metabolites, we exposed male B6C3F1 mice and male Sprague-Dawley rats in closed chambers over 6-8h to constant atmospheric BD concentrations. BD and exhaled EB were measured in chamber atmospheres during the BD exposures. EB blood concentrations were obtained as the product of the atmospheric EB concentration at steady state with the EB blood-to-air partition coefficient. B-diol, EBD, and DEB were determined in blood collected immediately at the end of BD exposures up to 1200 ppm (B-diol, EBD) and 1280 ppm (DEB). Analysis of BD was done by GC/FID, of EB, DEB, and B-diol by GC/MS, and of EBD by LC/MS/MS. EB blood concentrations increased with BD concentrations amounting to 2.6 micromol/l (rat) and 23.5 micromol/l (mouse) at 2000 ppm BD and to 4.6 micromol/l in rats exposed to 10000 ppm BD. DEB (detection limit 0.01 micromol/l) was found only in blood of mice rising to 3.2 micromol/l at 1280 ppm BD. B-diol and EBD were quantitatively predominant in both species. B-diol increased in both species with the BD exposure concentration reaching 60 micromol/l at 1200 ppm BD. EBD reached maximum concentrations of 9.5 micromol/l at 150 ppm BD (rat) and of 42 micromol/l at 300 ppm BD (mouse). At higher BD concentrations EBD blood concentrations decreased again. This picture probably results from a competitive inhibition of the EBD producing CYP450 by BD, which occurs in both species.

Animals↗

Technology and the environment: supportive resource or barrier for people with developmental disabilities?

Findings from needs assessments and abandonment studies point to issues with health care providers, particularly in their ability to listen to the needs of the consumer and important others regarding AT-EI. Professionals need to listen to what people are telling them or, in many cases, what they are not telling them. Actions and nonverbal messages can speak very loudly. Strategies to communicate and collaborate with consumers need to be developed. Regardless of ability to communicate or the severity of the impairments the person may be experiencing, it is important to withhold judgments that may underestimate a person's potential or desire to be in control of life decisions. AT-EI service have often seen people labeled with severe or profound intellectual disabilities challenge that diagnosis after accessing a communication or access system. Likewise, a person with a severe disability has the right to supportive resources and to the same level of respect, dignity, and quality of life as any other member of society. Using the technology and adapting the environment to provide opportunities for consumers to "voice" their wishes and control their lives can be an effective strategy to collaborate. When focusing on a rights-based philosophy, recognizing the difference between physical independence (e.g., physical and/or cognitive ability to do a task by oneself) and self-care management (e.g., access to and power to manage the supportive resources to live in the community regardless of level of physical ability) is important. We all rely on supports in our lives, whether it be tools or technology to help us do a job or another person, yet when we evaluate people with disabilities, the expectation is for people to function independently [23,24]. They even receive lower scores on functional assessments if they are using a piece of technology to do an activity. By shifting the focus to management of and access to resources versus level of physical dependence or burden, health care professionals can play a role in linking people to such resources as AT-EI and related services and strategies to support community living. Such a shift in focus also enables professionals to validate interdependence; that is, the give-take relationships that people have with each other to support each other [25]. The use of AT-EI by people with developmental disabilities often involves an interdependent relationship in which another person may help set up the environment or technology and, in turn, the consumer can then reciprocate and engage in an activity or a relationship [1]. Health care professionals also need to better understand and take into consideration the social context, its influence on consumers' use or nonuse of AT-EI, and the long-term influence on community living and participation decisions [1]. Nurses can involve important others in the process by listening to and considering their needs, and ensuring that they are informed about options, the benefits of using AT-EI for the consumer and themselves, and how to set up and troubleshoot the AT-EI. In cases where important others are not supportive, health care professionals may be in a position to link the consumer with other consumers and advocacy groups such as Centers for Independent Living or Self Advocates Becoming Empowered that may offer that support as well as membership in a collective community engaged in systems change. Health care professionals can serve as a system interface by linking people to information and resources to make informed decisions [26]. Resources on developmental disability and health, common issues that may occur, and life course planning help people identify functional issues and early signs of accelerated aging and proactively use the environment and technology to stay in living situations of choice. Few health care professionals are well prepared to provide services to people with developmental disabilities as they age; a great need exists for providers of such specialized services and for proactive later-life screenings that can identify issues early and make the most use of AT-EI strategies to address aging issues [26,28]. At any given point in time in the life of people with developmental disabilities, many different professionals and systems may be involved in decisions that could include AT-EI. Medical, educational, vocational, independent living, and case management systems may all be working with the person; however, there is often limited or no communication between them, particularly as the person ages or transitions between settings. Health care professionals, even when they are working with an individual on a limited basis, can and should take on active roles in linking consumers and important others with other systems and should ensure that information about their AT-EI needs is transferred accurately between systems. Most likely, nurses may be in a role to refer a person to specialized services, whether they may be medical, rehabilitative, AT-EI-specific, or disability advocacy groups that can help support the person as they face barriers or seek out AT. Nurses may also be in a role to pass on important information about the person's health and medical status that can help to better inform AT-EI decisions to ensure the AT meets the person's needs across contexts. As an interface, nurses may assume a role as a supporting advocate for accessing resources, not as a gatekeeper who makes decisions for people. This includes referring individuals with developmental disabilities to people and groups that know how to get AT-EI, how to fund it, and how to troubleshoot it, and linking them to other people with disabilities who are sharing strategies in person and on-line. It also includes focusing beyond basic self-care and considers AT-EI strategies that enable a person to participate in high meaning activities and roles in the home and the community. Participation in activities identified as highly meaningful and important to the person, such as participating in a religious community, networking with other people on-line, gardening, or being a member of a community group, to name a few, can positively contribute to health, wellness, and quality of life; the challenge is to create and adapt the environment (social, physical, and societal) to support participation choices and control.

Adolescent↗

Polysaccharide-based pneumococcal vaccines in the prevention of acute otitis media.

New pneumococcal vaccines, consisting of 7-11 capsular polysaccharides coupled to protein carriers, are able to induce functionally active humoral and mucosal antibody responses. They also reduce mucosal carriage of pneumococci in the vaccinees. Preliminary results from efficacy trials suggest that about one-third of pneumococcal otitis could be prevented by using the seven-valent pneumococcal conjugate vaccine. If these efficacy estimates are true throughout childhood, up to 1.2 million episodes of acute otitis are preventable annually in the US. The true impact of the vaccine on otitis burden is dependent not only on the efficacy as demonstrated in the efficacy trials but also on the impact of the vaccine on the mucosal carriage of bacteria and on the herd immunity induced by vaccinations. Ongoing follow-up studies will reveal whether these factors increase or decrease the efficiency of the proposed vaccination programme.

Acute Disease↗

Influence of birth interval and child labour on family energy requirements and dependency ratios in two traditional subsistence economies in Africa.

The consequences of different birth intervals on dietary energy requirements and dependency ratios at different stages of the family lifecycle are modelled for Gambian agriculturalists and !Kung hunter-gatherers. Energy requirements reach a peak at between 20 and 30 years after starting a family for the Gambians, and between 15 and 20 years for the !Kung. For the Gambians, shorter birth interval confers no economic advantage over the traditional birth interval of 30 months. For the !Kung, the lack of participation in subsistence activities by children gives an output:input ratio in excess of that reported in other studies, suggesting that they are in a state of chronic energy deficiency.

Adolescent↗

[Does unemployment cause illness? A review of the status of knowledge of the correlation between unemployment, physical and psychological health risks].

Unemployment appears to be a complex condition that burdens the individuals affected in multiple ways both at job loss and in long-term unemployment. To a lesser extent unemployment may also relieve the stressors and risks associated with the place of work. The scope and nature of the burden experienced depends on individual factors, such as mental stability and coping resources, on economic, social and cultural factors, such as availability of alternative roles, system of social security and social context. In the industralized countries, especially in the Federal Republic of Germany, financial security and society's attitudes towards unemployment are less unfavourable than during the economic recession between the two world wars. Nevertheless, household income should not be overlooked as an important factor leading to stress beyond a certain threshold. In this respect it is noteworthy that the income of the unemployed households in the Federal Republic of Germany decreased by 8% between 1981 and 1983 (Brinkmann, 1986). Quantitative relationships between unemployment and physical health have frequently been reported. In studies whose designs allow such associations to be explained selection factors, i.e. an overrepresentation of frequently or chronically ill and disabled individuals among those losing their jobs and the long-term unemployed, contribute to the increased morbidity among the unemployed to a considerable extent. Causal relationships between unemployment and physical health risks have not yet been proven directly, which does not mean that there are none. The mediation of health risks by changes in behaviour during unemployment which as such might lead to or reduce morbidity and mortality risks has not yet been studied sufficiently. Unemployment appears to have both an increasing and a reducing effect, but also no effect at all on the use of alcohol and tobacco in different populations. But we do not yet know enough about the mechanisms bringing about these effects. There are more consistent findings indicating that sustained unemployment influences personal well-being. This influence is reflected primarily in unspecific physical complaints and mild or moderately severe depressive changes of mood. The most important finding of increased health risks in the unemployed versus the employed are elevated rates of suicide and attempted suicide. This finding, too, seems to be attributable to selection factors, i.e. predominantly to an overrepresentation of mental disorders and substance abuse associated with an increased suicide risk among job-losers.(ABSTRACT TRUNCATED AT 400 WORDS)

Disease Susceptibility↗

The changing age distribution in Indonesia and some consequences.

"Beginning with a discussion of the sources and quality of Indonesian age data by sex, this paper examines the changes in the functional age groups of the population of Indonesia from 1971 to the year 2005, and the implications of these changes for education, labour force participation, dependency ratios and fertility. Data for the period 1971 to 1985 are based on actual enumerations, while those for the period 1990 to 2005 are based on projections. Although the provisional totals of the 1990 Census had been released before the publication of this paper, their breakdown by age was still not available. The functional age categories discussed in the paper include the pre-school years, the primary and intermediate school ages, the teenage years, the reproductive ages of women, the principal working ages and the post-work years. It concludes with a discussion of various policy and planning implications of these changes."

Age Distribution↗

Demographic aspects of ageing.

The first part of this paper examines future changes in the age structure of the population of England and Wales which are likely to occur as a result of past and future changes in fertility and mortality. These changes in fertility and mortality are examined in some detail. Different methods of projecting future changes in mortality are discussed. On the basis of conservative estimates of these changes, estimates are made of the future economic strain of dependency and there is some discussion of the way in which this might be best handled to the advantage of both the active and the elderly populations. The second part of the paper looks at different ways of examining improvements in longevity and also discusses some of the biological and environmental factors involved. Reference is made to the limited morbidity data available and the tentative conclusion is reached that improvement in longevity, so far, owes less to the reduction of disease incidence than to medical maintenance. This review paper, which relates to England and Wales, is in two main parts: (1) a general discussion of the population factors and changes which have led to a focusing of attention upon the ageing of the population and associated economic problems; and (2) a consideration of the implications of current health advances for individual survival.

Aging↗

Government size, demographic changes, and economic growth.

"This paper examines the effect of government size on the growth rate of per capita output by incorporating demographic variables. Evidence from more than 86 countries suggests that the demographic variables not only affect economic growth, but also determine the size of government. Both the young and the old age dependency ratios were positively related to the size of government, while population density and population size were negatively related to the size of government. Moreover, when the demographic variables are included in the growth equations, the effect of government size on the growth rate of per capita output became insignificant rather than, as prior studies showed, significantly negative."

Demography↗

The geography of elderly minority populations in the United States.

"Because minority populations often have greater needs for health care and fewer resources to pay for it, it is important to assess the demand for services. This paper takes an initial step in that direction by focusing upon the geographic distribution of elderly minority populations in the United States. The study is carried out at several spatial scales, and it is concluded that elderly minority populations tend to be even more segregated than their non-elderly counterparts."

Adult↗

Antibody-dependent reductions in mouse hookworm burden after vaccination with Ancylostoma caninum secreted protein 1.

Vaccination of mice with either third-stage Ancylostoma caninum infective hookworm larvae (L3) or alum-precipitated recombinant Ancylostoma secreted protein 1 from A. caninum (Ac-ASP-1) results in protection against hookworm challenge infections. Vaccine protection is manifested by reductions in lung hookworm burdens at 48 h postchallenge. Mice actively immunized 4 times with Ac-ASP-1 also exhibited reductions in hookworm burden in the muscles. Hookworm burden reductions from Ac-ASP-1 immunization were associated with elevations in all immunoglobulin subclasses, with the greatest rise observed in host IgG1 and IgG2b. The addition of a fourth immunization resulted in even higher levels of IgG and IgE. In contrast, L3-vaccinated mice exhibited marked elevations in IgG1 and IgM, including anti-Ac-ASP-1 IgM antibody. Passive immunization with pooled sera from recombinant Ac-ASP-1-vaccinated mice also resulted in lung hookworm burden reductions. It is hypothesized that recombinant Ac-ASP-1 vaccinations elicit antibody that interferes with parasite larval migration.

Ancylostoma↗

Primary care management of acute low back pain.

Acute low back pain will affect more than 80% of the population, with more than 28% of the industrial workforce suffering from lost work. Acute low back pain is recognized as the third most common illness presenting to private practice groups. The psychosocial overtones of depression and anxiety that often coexist or predate the episode of acute low back pain add to its complexity and cost. Diagnosis and treatment options are reviewed based on the Agency for Health Care Policy and Research recommendations of 1994. This article reviews details of the history and physical with emphasis on the importance of a thorough neurologic and psychologic evaluation. "Red flags" that should warn the clinician of the presence of a more acute illness are discussed with recommendations for referral. The treatment of acute low back pain now centers on increasing mobility and functional use of the spine as soon as possible. Nonsteroidal anti-inflammatory agents as well as aspirin and acetaminophen are recommended as first-line drug treatments; they have been found to be equally as effective as muscle relaxants and opioids for the control of pain without the burden of dependence and potential for abuse.

Acute Disease↗