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X-ray equipment performance: a 3.5 year case history.

The continuing performance of radiographic imaging systems has become increasingly important as the complexity and cost of these systems continue to escalate, as replacement funding becomes more difficult to obtain, and as advisory and regulatory agencies place increasing emphasis on equipment-oriented quality control procedures. As a guide to the continuing performance of these imaging systems, selected performance indicators for two general-purpose radiographic-fluoroscopic units have been monitored for a 3.5 year period. The observations suggest that with inspection and adjustment at 6 month intervals for generator, x-ray tube, and beam restriction systems, and at 2 month intervals for the intensified fluoroscopic imaging system, the overall performance of the imaging systems can be maintained at a high level of consistency equivalent to the performance achieved when the equipment was initially installed.

Fluoroscopy↗

Vertebral morphometry derived from digital images.

OBJECTIVE: We describe a method for capturing measurement data directly from digitized images using specialized software and high-resolution workstations. We have evaluated the reliability, accuracy, and reproducibility of this method in an international clinical trial involving vertebral morphometry. MATERIALS AND METHODS: Accuracy was determined using clinical radiographs measured with vernier calipers and a film phantom. Intra- and interobserver variabilities were assessed, and longitudinal reproducibility was evaluated. As part of the trial, spinal radiographs were collected from more than 200 international health care facilities and digitized at four screening centers. Digitized images were stored and sent to our central facility for morphometry and archiving. Timeliness and variability of the process were tracked. RESULTS: Relative accuracy was nearly 100%. Correlation with clinical measurements was high (r = .96; p < .05). The mean coefficient of variation for interobserver variability was 2%. Intraobserver variation was 3-5%. The coefficient of variation for longitudinal reproducibility ranged from 4% to 6%. After 9 months of operation, our trial included 9494 patients. Of approximately 36,000 radiographs, 98% passed quality review. Only 1% of vertebral levels were not measurable. Hardware and software problems were minimal. CONCLUSION: The use of digitized images for morphometry is accurate, reproducible, and convenient. When applied to a large-scale clinical trial, it offers unique advantages that may justify the cost and complexity that exceed those of conventional radiographs.

Female↗

Repeated measurement: sensitive tests for experiments with few animals.

Animal scientists who conduct experiments involving repeated measurements of animals often are frustrated by low statistical power of tests for comparisons of treatment means. In many cases, low power of the traditional tests simply is the consequence of low replication (few animals per treatment) that was forced by cost or complexity of experimental technique. A method is given for comparing treatments in a way that permits sensitive tests (via partition of the treatment X period interaction), often when the number of animals per treatment is not more than five or six. Modifications for the procedure are given for the case of heterogeneous variances and covariances. An example from mammary physiology is used to illustrate the procedure and to compare it with standard methods of analysis.

Analysis of Variance↗

Virtual remote center of motion control for needle placement robots.

OBJECTIVE: We present an algorithm that enables percutaneous needle-placement procedures to be performed with unencoded, unregistered, minimally calibrated robots while removing the constraint of placing the needle tip on a mechanically enforced Remote Center of Motion (RCM). MATERIALS AND METHODS: The algorithm requires only online tracking of the surgical tool and a five-degree-of-freedom (5-DOF) robot comprising three prismatic DOF and two rotational DOF. An incremental adaptive motion control cycle guides the needle to the insertion point and also orients it to align with the target-entry-point line. The robot executes RCM motion without having a physically constrained fulcrum point. RESULTS: The proof-of-concept prototype system achieved 0.78 mm translation accuracy and 1.4 degrees rotational accuracy (this is within the tracker accuracy) within 17 iterative steps (0.5-1 s). CONCLUSION: This research enables robotic assistant systems for image-guided percutaneous procedures to be prototyped/constructed more quickly and less expensively than has been previously possible. Since the clinical utility of such systems is clear and has been demonstrated in the literature, our work may help promote widespread clinical adoption of this technology by lowering system cost and complexity.

Algorithms↗

Detection and characterization of amplified fragment length polymorphism markers for clinical mastitis in Canadian Holsteins.

Mastitis is the most frequent, complex, and costly disease in dairy cattle. Genetic improvement of milk production traits has accompanied an increased susceptibility to mastitis. To determine genome-wide quantitative trait locus-linked markers for mastitis resistance, a total of 200 cows, comprising 100 top clinical mastitis- (CM) resistant and 100 top CM-susceptible cows, were screened by selective DNA pooling and amplified fragment length polymorphism (AFLP) technique. The AFLP analysis on resistant and susceptible pools using 89 selective primer combinations revealed 27 significant AFLP markers at a false discovery rate (FDR) of < 5%. The most promising AFLP marker was then selected for further characterization. Individual AFLP genotyping of the marker on all selected animals confirmed a significant difference. Sequence analysis detected a single nucleotide polymorphism (A<-->G) responsible for the AFLP polymorphism, which was named CGIL4. The PCR-RFLP analysis indicated that the frequency of allele A was significantly higher in the resistant group. The logistic regression analysis demonstrated that the marker was significantly associated with somatic cell score, CM residual values, and production traits. Radiation hybrid mapping assigned the marker to Bos taurus autosome 22. The present study provides promising markers for marker-assisted selection for CM resistance. Our results also demonstrated the capability of AFLP on selective DNA pools as a method for detection of genome regions containing quantitative trait loci.

Amplified Fragment Length Polymorphism Analysis↗

Detection and identification of intestinal pathogenic bacteria by hybridization to oligonucleotide microarrays.

AIM: To detect the common intestinal pathogenic bacteria quickly and accurately. METHODS: A rapid (<3 h) experimental procedure was set up based upon the gene chip technology. Target genes were amplified and hybridized by oligonucleotide microarrays. RESULTS: One hundred and seventy strains of bacteria in pure culture belonging to 11 genera were successfully discriminated under comparatively same conditions, and a series of specific hybridization maps corresponding to each kind of bacteria were obtained. When this method was applied to 26 divided cultures, 25 (96.2%) were identified. CONCLUSION: Salmonella sp., Escherichia coli, Shigella sp., Listeria monocytogenes, Vibrio parahaemolyticus, Staphylococcus aureus, Proteus sp., Bacillus cereus, Vibrio cholerae, Enterococcus faecalis, Yersinia enterocolitica, and Campylobacter jejuni can be detected and identified by our microarrays. The accuracy, range, and discrimination power of this assay can be continually improved by adding further oligonucleotides to the arrays without any significant increase of complexity or cost.

Bacteria↗

Young people considering nursing as a career: starters vs. non-starters.

This study focused on applicants who were accepted to a nursing education program but did not begin their studies, thus wasting time, effort and money. Of 953 accepted applicants, 27% did not enter the program. Significant variables differentiating starters from non-starters were higher psychometric score, higher paternal education, lower priority for nursing studies, older age, non-Israeli country of birth and not completed army service. The study relating to starters vs. non-starters is one aspect of a large study (Ehrenfeld, Rotenberg, Sharon, & Bergman, 1995). In most nursing education programs the number of applicants exceed the faculty's capacity, and suitable candidates must be rejected. It is therefore both wasteful and disappointing when accepted applicants change their mind and do not actually begin in the program. In light of the costs and complexities involved in the student screening process and the continuous efforts extended today all over the world to raise the standards of nursing education and care, the factors differentiating starters from non-starters may have important implications. The aim of the present study was to evaluate the screening process at the Tel Aviv University baccalaureate nursing program and determine which variables were predictive of starters and non-starters among accepted applicants.

Discriminant Analysis↗

La Commande du Coeur ("Shop for Your Heart"): a point-of-choice nutrition education campaign in a low-income urban neighborhood.

This research suggests that point-of-choice campaigns can be implemented in low-income communities, although store personnel began to view campaign materials and activities as a nuisance after 2 months, and their enthusiasm and commitment decreased. Employee interest might have been more sustainable if the campaign had been shorter or if it had been implemented 1 or 2 weeks at a time rather than being continually present in the store. This approach would necessitate easily removable displays and materials. Items such as the kiosk were too cumbersome for easy setup and removal. Despite widespread advertisement and 4 months in the community, awareness of the campaign was moderate and use was low. Not surprisingly, awareness and use were higher among women, older persons, and persons who lived in St-Henri, possibly because they do the shopping or have the time and interest to notice promotional messages. Awareness and use of specific campaign components appeared to be higher for easily available, highly visible materials and activities that required little or no effort by consumers. Others have suggested that consumer effort required to recognize, view, read, and internalize point-of-choice messages is important and have recommended methods such as videocassettes of nutrition messages or brand-specific shelf labels that reduce customer effort to absorb information. Both the intervention agent and retailers reported that the cholesterol screening events were very popular and that they should have been offered more frequently. Although these events are relatively complex and costly, this response suggests that they are an appropriate and effective way to increase awareness and heighten interest. By contrast, almost no interest was shown in supermarket tours. Although our publicity might have been ineffective, it is more likely that this kind of activity did not interest the target group, possibly because of lack of time or low perceived need or usefulness.

Adolescent↗

Measuring and modifying hospital drug use.

OBJECTIVE: Various methods are available to quantitate medicinal drug use in hospitals. These represent a hierarchy of clinical specificity, complexity and cost of acquisition. Similarly, various strategies and methods are available to modify prescribing patterns. The objectives of this study are to illustrate these processes of measurement of drug use and modification of prescribing patterns using specific examples derived from practice at three major Australian teaching hospitals over 15 years. DESIGN, SETTING, MAIN OUTCOME MEASURES: Methods to measure and modify drug usage in the three hospitals are outlined and 12 examples are presented by specific drug or drug category. Each example includes details of the methods used to detect inappropriate drug use (pharmacy purchases, pharmacy issues, prescription analysis, clinical record review, performance and outcome assessment), the intervention strategies used (re-educative, persuasive, facilitative, power), the methods employed to alter drug prescribing and the relative effectiveness and cost-efficiency of the interventions. RESULTS: Readily available, relatively cheap quantitative methods provide significant information and an efficient basis for planning definitive studies, and substantial modification of prescription patterns is possible through the strategic use of limited manpower and resources.

Algorithms↗

IVF and related technology. The present and the future.

OBJECTIVE: To describe the current status of in-vitro fertilisation (IVF) and related technologies, including: the indications for the procedures and the problems associated with the use of stimulated cycles; the use of frozen embryos and donor eggs; and the newer procedures of gamete micromanipulation for male infertility, immature egg collection as a possible alternative to the stimulated cycle, and preimplantation genetic diagnosis. DATA SOURCES AND STUDY SELECTION: The clinical experience and research at Monash IVF and the Centre for Early Human Development, Monash University, were reviewed in association with key original or review articles in the world literature. DATA SYNTHESIS: Cumulative pregnancy rates for IVF and the gamete intrafallopian transfer (GIFT) procedure at Monash IVF demonstrate that 29% of IVF patients and 55% of GIFT patients will have a live baby, the average number of treatments pursued being 3.4. Analogues of gonadotrophin releasing hormone (GnRH) have improved pregnancy rates, reduced blood sampling, and prevented natural ovulation. Disadvantages of stimulated cycles include a higher risk of multiple pregnancy, a higher risk of hyperstimulation, and behavioural changes due to the effects of drugs. Natural cycles or immature egg collection at incidental laparoscopy may become alternatives to the use of the stimulated cycle. In Australia the GIFT procedure is more successful than IVF and is nearly always used if the fallopian tubes are normal. Multiple pregnancies may be reduced, particularly triplets, by reducing the number of eggs or embryos transferred to two when egg or embryo quality is high. Embryo freezing has made a small but important contribution to overall pregnancy rates by enabling patients to use excess eggs and embryos. The social and legal concerns resulting from the use of frozen embryos have required new ethical and legal considerations. Donor eggs have made a small contribution to achieving pregnancy in women with absent or inappropriate eggs and increased the chance of conception in women over the age of 40. Micromanipulation of sperm and eggs has enabled fertilisation and conception when sperm are defective in quantity or quality. Sampling of cells in early embryos enables genetic diagnosis and may be used in selecting chromosomally normal embryos in IVF procedures or in couples at risk of recessive genetic disease. CONCLUSION: Assisted reproductive technology has developed over a decade to become useful for couples with infertility which cannot be cured by simpler treatments. The birth rates are comparable to natural conception and the incidence of congenital malformation is not increased. The costs and complexity of treatment have been reduced to in turn reduce the stress and social inconvenience of therapy. Problems related to the high risk of multiple pregnancy and the use of the stimulated cycle are being reduced and new techniques for severe male infertility and the detection of genetic abnormalities in the embryo are being introduced.

Female↗

Who are the donors in organ donation? The family's perspective in mandated choice.

Evidence that families requested to permit organ donation refuse half the time has led to proposals for mandated choice. Under mandated choice, a person's donation wishes would be collected and retrieved at death, and requests to families would be avoided. There are both ethical and logistic problems with mandated choice. The view of the family should be respected in organ requests, even when patient wishes are known. Public sentiment against overriding family wishes could cause low rates of pro-donation registration. Caregivers have usually refused to take organs when families oppose donation. Logistic issues with mandated choice include the cost and complexity of maintaining a national database on donors and the enforcement of registration. No such database of adults currently exists, even for tax purposes. Two states that have mandated choice programs through departments of motor vehicles report relatively low number of pro-donation registrants compared with nondonors or undecided persons. Public education and voluntary donor identification hold more potential to increase donation.

Adult↗

Using information technology to improve the health care of older adults.

The high burden of illness and frailty common among our growing population of older adults often results in fragmentation of care across providers and health care systems, increasing the complexity and costs of caring for these patients. Information technology offers one way to meet this challenge. Scientists at the Regenstrief Institute have more than a quarter-century of experience in using medical informatics to support clinicians in the day-to-day care of older adults. Their research has progressed through several evolutionary cycles, beginning with the acquisition of relevant data and moving to studies of the most efficient and effective mechanisms that bring information to bear at the time of clinical decision making. Information technology designed with the input of the end user has the greatest promise of changing provider behavior because it balances technological challenges with the cultural context of the practice environment. One topic of active research is information technology to support transitions of care among sites and providers. These transitions place older adults at increased risk for avoidable illness, death, and health care costs. Information systems that improve communication among providers during these transitions have the potential to improve safety and reduce costs.

Aged↗

Downsizing a branch clinic system.

Medical group practices often underestimate the cost and complexity of building a branch clinic network. This case study follows the Ramsey Clinic's experience in countering this problem.

Group Practice↗

Risk management or political micromanagement?

A major healthcare issue of the 1990s is whether providers will create effective risk management programs to cope with government reform mandates or whether an increasingly costly and complex regulatory structure will force them to make changes. Compliance with the Joint Commission on Accreditation of Healthcare Organizations (JCAHO) standards on patient care will become increasingly important to healthcare risk management in the 1990s. The JCAHO standards create a benchmark from which government entities set their present standards and assemble agendas for the future. Another healthcare risk management factor is compliance with the National Practitioner Data Bank. The data bank is intended to protect healthcare consumers from providers who have demonstrated a tendency to commit malpractice. However, the data bank could cause problems for healthcare providers: Inaccurate or misleading data could unfairly haunt them. Healthcare risk managers should be familiar with the prohibitions on patient dumping found in the Consolidated Omnibus Budget Reconciliation Act of 1985. The amendments of the Omnibus Budget Reconciliation Act of 1989 (OBRA '89) do not create strict liability, nor do they impose traditional tort standards that could guide courts in cases that will inevitably result from new rules, creating a "litigation time bomb." And OBRA '90 significantly revises the law. Other risk management issues include the manner in which facilities handle and dispose of medical waste and the manner in which they resolve disputes.

Accreditation↗

Payment for drug therapy.

This regular column of Physician Executive deals with the issues surrounding expanding technology in the delivery of health care services. Although technology is most commonly viewed in terms of equipment and procedures, the growing cost and complexity of drug therapy has made even this technology the target of assessment. The following report details the positions taken by the buyers of health care services on payment for drug therapy.

American Medical Association↗

Payment of hospital cardiac services.

This report describes how acute-care community hospitals in the United States get paid for services when their patients either are entitled to Medicare or Medicaid benefits or subscribe to a Blue Cross or Blue Shield plan, a commercial insurance plan, a health maintenance organization, a preferred provider organization, or some other third-party payment mechanism. The focus of this report is on cardiac services, which are the most common type of inpatient services provided by acute-care community hospitals. Over the past three decades, extraordinary advances in medical and surgical technologies as well as healthier life-styles have cut the annual death rate for coronary heart disease in half. Despite this progress, cardiovascular disease remains the number one cause of hospitalization. On average nationwide, diseases and disorders of the circulatory system are the primary reason for 17 percent of all patient admissions, and among the nation's 35 million Medicare beneficiaries they are the primary reason for 25 percent of all admissions. In the United States heart disease is the leading cause of death and a major cause of morbidity. Its diagnosis and treatment are often complex and costly, often requiring multiple hospitalizations and years of medical management. To focus management attention and resources on the immense cardiology marketplace, many hospitals have hired individuals with strong clinical backgrounds to manage their cardiology programs. These "front-line" managers play a key role in coordinating a hospital's services for patients with cardiovascular disease. Increasingly, these managers are being asked to become active participants in the reimbursement process. This report was designed to meet their needs. Because this report describes common reimbursement principles and practices applicable to all areas of hospital management and because it provides a "tool kit" of analytical, planning, and forecasting techniques, it could also be useful to hospital marketing, planning, finance, and accounting personnel. In addition, the rich reservoir of data contained in the appendixes to this report may be of interest to hospital chief executive officers, cardiologists, and cardiovascular surgeons. In addition to the introduction and summary sections, this report contains five main sections. Sequentially, these deal with: the ways hospitals get paid for what they do; ICD-9 coding DRGs, PPS, and Medicare claims administration; ways to analyze how well your hospital is doing; planning and forecasting; the new Resource-Based Relative Value Scale.(ABSTRACT TRUNCATED AT 400 WORDS)

Abstracting and Indexing↗

Options in information systems outsourcing.

Virtually any of the activities required to operate a hospital's information systems department can be outsourced, that is, performed by an outside firm. Outsourcing can be used as a business strategy to optimize resources to attain financial, tactical and strategic goals. Benefits include a smaller IS staff, reduced overhead and cost avoidance particularly in the area of capital equipment purchasing. However, outsourcing IS is not without risks and is not a panacea. It may even bring on its own challenges, particularly in managing expectations of in-house personnel. Risks include loss of control, vendors with little or no experience with the hospital's operations and culture and dependence on vendors when in-house personnel cannot adapt. IS outsourcing hasn't got as much of a track record in health care as in other industries, but with the growing cost and complexity of hospital IS operations, outsourcing seems inevitable.

Contract Services↗

Constitutional rights versus malpractice insurance settlements.

The increasing costs and complexity of malpractice litigation have created an statutory right that allows malpractice insurance companies to settle malpractice claims regardless of the desires of the defendant physician. In the past, the consequences of settling a malpractice claim out of court were not as important as they are today. The Health Care Quality Improvement Act of 1986 mandates that any settlement in behalf of a physician be documented in the National Practitioner Data Bank (NPDB), which must be consulted every time the physician is credentialed. This NPDB requirement denies due process to health care providers and thus becomes a violation of the federal and many state constitutions. Physician executives and medical leaders must bring these issues to the table and negotiate solutions before damage to practicing physicians and the U.S. health care delivery system caused by this legal paradox become too severe.

Civil Rights↗