Balloon-artery interactions during stent placement: a finite element analysis approach to pressure, compliance, and stent design as contributors to vascular injury.
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Endovascular stents expand the arterial lumen more than balloon angioplasty and reduce rates of restenosis after coronary angioplasty in selected patients. Understanding the factors involved in vascular injury imposed during stent deployment may allow optimization of stent design and stent-placement protocols so as to limit vascular injury and perhaps reduce restenosis. Addressing the hypothesis that a previously undescribed mechanism of vascular injury during stent deployment is balloon-artery interaction, we have used finite element analysis to model how balloon-artery contact stress and area depend on stent-strut geometry, balloon compliance, and inflation pressure. We also examined superficial injury during deployment of stents of varied design in vivo and in a phantom model ex vivo to show that balloon-induced damage can be modulated by altering stent design. Our results show that higher inflation pressures, wider stent-strut openings, and more compliant balloon materials cause markedly larger surface-contact areas and contact stresses between stent struts. Appreciating that the contact stress and contact area are functions of placement pressure, stent geometry, and balloon compliance may help direct development of novel stent designs and stent-deployment protocols so as to minimize vascular injury during stenting and perhaps to optimize long-term outcomes. (+info)
The real and the nominal? Making inflationary adjustments to cost and other economic data.
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Given the scarcity of cost data for health interventions, there has been substantial use of a relatively small number of existing studies to underpin policy development formulation. Intervention-specific cost and cost-effectiveness data have been used to plan overall budgets, to assess the relative efficiency of different interventions and to consider the resource requirements for programme implementation at both the local and national levels. Cost and cost-effectiveness comparisons have been made between these studies and general sources such as the World Bank's World Development Report 1993. At the same time, information on key health sector variables, such as annual health expenditures, has been systematically compiled for more than two decades. The question of possible inflationary effects is becoming increasingly important as the original data on which these numbers are based ages. For example, cost figures from the mid-1980s require a 60% inflationary adjustment simply to maintain their real value in current dollars. This paper looks at methods to adjust cost data to account for inflation and discusses the difference between real or constant and nominal or current values. These methods are also used to make inflationary adjustments to other types of economic data such as income. (+info)
Spending on mental health and substance abuse treatment, 1987-1997.
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This paper is the result of an ongoing effort to track spending on mental health and substance abuse (MH/SA) treatment nationwide. Spending for MH/SA treatment was $85.3 billion in 1997: $73.4 billion for mental illness and $11.9 billion for substance abuse. MH/SA spending growth averaged 6.8 percent a year between 1987 and 1997, while national health expenditures grew by 8.2 percent. (+info)
Trends in Medicaid physician fees, 1993-1998.
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This study uses data on Medicaid physician fees in 1993 and 1998 to document variation in fees across the country, describe changes in these fees, and contrast how they changed relative to those in Medicare. The results show that 1998 Medicaid fees varied widely. Medicaid fees grew 4.6 percent between 1993 and 1998, lagging behind the general rate of inflation. This growth was greater for primary care services than for other services studied. Relative to Medicare physician fees, Medicaid fees fell by 14.3 percent between 1993 and 1998. Medicaid's low fees and slow growth rates suggest that potential access problems among Medicaid enrollees remain a policy issue that should be monitored. (+info)
Managing drug costs: the perception of managed care pharmacy directors.
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OBJECTIVE: To examine the perceptions of health plan pharmacy directors about drug costs and utilization drivers, interventions the plans use to control drug expenditures, and strategies considered necessary to permit continued provision of a comprehensive drug benefit. STUDY DESIGN/METHODS: A multipart survey developed and mailed to 500 pharmacy directors of managed care organizations across the country. RESULTS: The survey respondents (response rate = 18%) represented managed care health plans in the following percentages: 49% of respondents were from network/independent practice associations; mixed-model health maintenance organizations (HMOs), 20%; group HMOs, 15%; and staff-model HMOs and network/preferred provider organizations, 8% each. Drug mix and utilization were reported to be the primary drivers of drug expenditures. Half the respondents rated inflation as a somewhat strong cost driver. Interventions the health plans use to control drug expenditures include formularies, generic substitution, preauthorization, manufacturers' rebates, drug benefit design, physician profiling, target drug programs, academic detailing, and tiered copays. With the exception of formulary use, generic substitution, and manufacturers' rebates, which all the plans have instituted, the types of interventions used by the different model types vary widely. More than half the pharmacy directors reported generic substitution, drug benefit design, and differential copays as very effective interventions used to control drug costs. CONCLUSIONS: The majority of pharmacy directors predict continued double-digit increases in drug expenditures over both the short term and the long term. Of the respondents, 91% reported that additional limits and/or exclusions to the benefit design would be necessary to control these increases. To continue providing a comprehensive drug benefit, 54% indicated that they would have to achieve sufficient cost savings in other areas to offset increases in drug costs. (+info)
Movement toward individual health benefit accounts.
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There are strong pressures for employers to pursue defined contribution health benefits with individual health benefit accounts such as Medical Savings Accounts (MSAs), Health Care Reimbursement Accounts (HCRAs), and Comprehensive Individual Medical Accounts (CIMAs). Health care consumers are becoming more assertive. The political backlash against managed care is eroding provider-based cost control mechanisms. Health insurance premium inflation is intensifying. Advocates of the movement toward individual health benefit accounts view them as a means of restoring autonomy to the physician-patient relationship and controlling costs. Opponents are concerned that individual health benefit accounts of any type will segment insurance markets, benefiting the healthy and wealthy at the expense of the chronically ill and the poor. Can these accounts be designed so as to achieve their positive effects and minimize negative effects? (+info)
Job-based health insurance in 2001: inflation hits double digits, managed care retreats.
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Drawing on the results of a national survey of 1,907 firms with three or more workers, this paper reports on several facets of job-based health insurance, including the cost to employers and workers; plan offerings and enrollments; patient cost sharing and benefits; eligibility, coverage, and take-up rates; and results from questions about employers' knowledge of market trends and health policy initiatives. Premiums increased 11 percent from spring 2000 to spring 2001, and the percentage of Americans in health maintenance organizations (HMOs) fell six percentage points to its lowest level since 1993, while preferred provider organization (PPO) enrollment rose to 48 percent. Despite premium increases, the percentage of firms offering coverage remained statistically unchanged, and a relatively strong labor market has continued to shield workers from the higher cost of coverage. (+info)
Electronic journal access: how does it affect the print subscription price?
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OBJECTIVE: This study examined the rates of print journal subscription price increases according to the type of available electronic access. The types of access included: electronic priced separately from the print, combination print with "free online" access, and aggregated, defined here as electronic access purchased as part of a collection. The percentages of print price increases were compared to each other and to that for titles available only in print. The authors were not aware of prior objective research in this area. METHODS: The authors analyzed the percentage print price increases of 300 journals over a five-year time period. The titles were grouped according to type of available electronic access. The median and mean percentage print price increases were calculated and plotted for all titles within each group. RESULTS: Using both the median and the mean to look at the percentage print price increases over five years, it was obvious that print prices for journals with electronic access exceeded journals that did not offer an electronic option. Electronic priced separately averaged 3% to 5% higher than print only titles using both measures. Combination print with "free online" access had higher increases from 1996 to 1999, but, in 2000, their percentage increases were about the same as print only titles. The rate of price increases for aggregated titles consistently went down over the past five years. Journals with no electronic option showed the lowest percentage rates of print price increase. CONCLUSIONS: The authors' findings reveal that the increases of print prices for their sample of titles were higher if a type of electronic access was offered. According to the results of this study, aggregated collections currently represent the electronic option whose percentage price increase for print prices was lowest. However, the uneven fluctuations in rates of subscription prices revealed that the pricing of journals with electronic access is still evolving. More study is recommended to see if the trends observed in this study are sustained over a longer time period. (+info)