Pattern and factors leading to the diffusion of magnetic resonance imaging in Korean hospitals

OBJECTIVES: The purpose of this study was to examine the diffusion patterns of new medical technologies in Korean hospitals. We also sought to identify critical factors leading to the decision to acquire capital-intensive medical technology. The rationale and timing of magnetic resonance imaging (MRI) acquisitions were retrospectively evaluated according to a "whether, when, and why" paradigm. METHODS: We analyzed data pertaining to 232 hospitals with active medical residency programs. Of these, 185 hospitals owned or leased an MRI unit, and 47 had not acquired units as of June 2004. Data were collected from the Ministry of Health and Welfare, Korean National Statistical Office, and Korean Hospital Association databases, and variables were identified and classified as predisposing, enabling, or reinforcing factors. RESULTS: The MRI diffusion rate curve was linear for two types of hospital but was S-shaped for tertiary hospitals, which were early adopters of MRI. Significant predictors for MRI adoption included the per capita number of regional physicians (+), total number of existing regional MRI units (-), percentage of the regional population over 65 years of age (+), private ownership of the hospital, presence of a radiology residency program, number of beds (+), and regional per capita taxable income (+). CONCLUSIONS: Diffusion of MRI technology is occurring rapidly across Korean hospitals. The factors affecting MRI adoption in Korea are similar to the factors documented in other countries, namely regional population over age 65, regional income per capita, large hospitals, and teaching hospitals. This study provides baseline information for predicting diffusion patterns of other new and/or expensive medical technologies.     

Fixed fees and physician-induced demand: a panel data study on French physicians

This paper investigates on the existence of physician-induced demand (PID) for French physicians. The test is carried out for GPs and specialists, using a representative sample of 4500 French self-employed physicians over the 1979-1993 period. These physicians receive a fee-for-services (FFS) payment and fees are controlled. The panel structure of our data allows us to take into account unobserved heterogeneity related to the characteristics of physicians and their patients. We use generalized method of moments (GMM) estimators in order to obtain consistent and efficient estimates. We show that physicians experience a decline of the number of consultations when they face an increase in the physician:population ratio. However this decrease is very slight. In addition, physicians counterbalance the fall in the number of consultations by an increase in the volume of care delivered in each encounter. Econometric results give a strong support for the existence of PID in the French system for ambulatory care.     

Creating a strategic management plan for magnetic resonance imaging (MRI) provision

We were commissioned by the West Midlands NHS Regional Specialized Services Group (RSSG) to formulate a strategic plan for the management of Magnetic Resonance Imaging (MRI) within the West Midlands, UK. We needed to establish whether an increase in MRI provision was required, and if so to develop criteria to shape both the nature and location of MRI provision. We found that the UK had relatively low MRI provision per capita by international standards, and that the West Midlands region of the UK had less than the UK average level of MRI provision per capita. Within the region there was a 'mixed economy' of MRI provision involving fixed site scanners owned by the NHS and private companies, and private sector mobile MRI provision. There was little evidence of inappropriate MRI use, but considerable evidence of under-provision. Most MRI scanners in the region were heavily utilized, and average waiting times for MRI frequently exceeded guidelines (of a maximum 13-week wait for non-urgent MRI scans). Projections from NHS Trusts, MRI suppliers, and experts in the MRI field, led us to the conclusion that demand for MRI was likely to grow by between 12.5 and 18.5% per annum. This implies that 8-14 additional MRI scanners might be required within the West Midlands over the next 5 years, to meet existing, and rising demand for MRI. We therefore developed criteria (outlined in the paper) to enhance the productive and allocative efficiency of the deployment of MRI provision, whilst improving the configuration of MRI with reference to geographical equality of access to MRI.     

Health technology diffusion rates. Statins, coronary stents, and MRI in England

OBJECTIVE: To analyze the rates and influences on the adoption of three selected health technologies: statins, coronary stents, and magnetic resonance imaging (MRI). METHODS: A retrospective diffusion study using primary care prescribing data and questionnaire responses from acute hospital trusts in the West Midlands region (population 5.3 million or 10% of England). RESULTS: The selected technologies had markedly different diffusion curves. Statins diffused rapidly soon after launch. Coronary stents were initially used 6 years after first availability, but within 2 years all responding hospitals reported using them. MRI scanners were initially purchased 6 years after first availability with a subsequently slow rate of diffusion, and are still absent from some hospitals. Influences on the adoption of each technology were different. Commercial marketing was reported as a major influence on the diffusion of statins but not at all on MRIs. Cost impact was a major negative influence on the diffusion of MRI scanners and statins, whereas enthusiastic individuals were key to the diffusion of stents. CONCLUSIONS: Influences on adoption and consequent diffusion rates are very different for different health technologies. It is not at all clear that such diffusion patterns relate well to an optimum timing rate. This has important implications for technology gatekeepers in health care.     

Type of contract and supplier-induced demand for primary physicians in Norway

The focus of the present study is to examine whether supplier-induced demand exists for primary care physician services in Norway. We compare how two groups of physicians, with and without incentives to induce, respond to increased competition. Contract physicians receive their income from fee-for-item payments. They have an incentive to compensate for a lack of patients by inducing demand for services. Salaried physicians receive a salary which is independent of output. Even though increased competition for patients reduces the availability of patients, they have no financial incentive to induce. Neither of the two groups of physicians increased their output as a response to an increase in physician density. This result could be expected for salaried physicians, while it provides evidence against the inducement hypothesis for contract physicians.     

Physician-induced demand: an empirical analysis of the consumer information gap

The hypothesis of physician-induced demand is examined empirically in a model where variation in consumer information affects health-care utilization. A theoretical framework is posited under which demand-inducing physicians will provide more services, ceteris paribus, to their medically uninformed patients. Using data from the CHAS-NORC National Survey of Access to Medical uninformed patients. Using data from the CHAS-NORC National Survey of Access to Medical Care 1975-1976, physician office visit demand equations are estimated. The key finding is that medical professionals and their families are as likely, if not more likely, to visit physicians as other people, controlling for sociodemographic factors, price factors, access to care factors and perceived health status.     

Hospital-physician portals: the role of competition in driving clinical data exchange

Recent policy efforts to encourage the use of health information technology are emphasizing development of communitywide health information exchanges to share clinical data across patient care settings. Interviews in twelve U.S. communities show that most large hospitals have or are developing physician portals to provide admitting physicians with remote access to patient records, but there is little data sharing among unaffiliated organizations. Competition among hospitals for physicians is a key factor driving adoption of these proprietary systems. In contrast, provider and health plan competition and adversarial relationships between providers and plans are viewed as major barriers to communitywide clinical data sharing.     

医疗供方诱导需求理论及其在我国的实证研究

医疗费用逐年增长,由于医疗服务供方在医疗信息上的优势及医疗产业化的背景,使得医疗供方诱导需求现象成为医疗费用增长不可忽视的因素,大部分的研究都无法对诱导需求现象进行定量研究。参考Carlsen and Grytten提出的方法,结合我国的实际情况,通过对医疗资源分布与医疗资源利用量间的相关性进行相关分析与回归分析,从而判断医疗供方的增长对医疗费用增长的影响程度,为政策制定者控制供方诱导需求提供了定量的判断依据。     

Competition and equity in health care markets

We provide a model where hospitals compete on quality under fixed prices to investigate how hospital competition affects (i) quality differences between hospitals, and as a result, (ii) health inequalities across hospitals and patient severities. The answer to the first question is ambiguous and depends on factors related to both demand and supply of health care. Whether competition increases or reduces health inequalities depends on the type and measure of inequality. Health inequalities due to the postcode lottery are more likely to decrease if the marginal health gains from quality decrease at a higher rate, whereas health inequalities between high- and low-severity patients decrease if patient composition effects are sufficiently small. We also investigate the effect of competition on health inequalities as measured by the Gini and the Generalised Gini coefficients, and highlight differences compared to the simpler dispersion measures.     

Rural Radiology: Who is Producing Images and Who is Reading Them?

The purpose of this study is to identify the local availability and trends in local availability of imaging technology and interpretation services in rural hospitals in the northwestern United States during the period between 1991 to 1994. Another objective is to describe hospital and community factors associated with the diffusion of image production and interpretation services. The information for this study was gathered through telephone surveys of rural hospital administrators in eight northwestern states in 1991 and 1994. The availability of magnetic resonance imaging (MRI) equipment, computed tomography (CT) scanners, ultrasonography equipment, and dedicated mammography equipment increased between 1991 and 1994. The increases in MRI units were primarily in mobile equipment, while ultrasonography and mammography equipment increases were primarily fixed hospital-based units. In 1994, image interpretation in the rural hospitals was provided by both primary care and radiology physicians. Forty-six (11.5%) of the rural hospitals had no on-site radiology services and only 73 (18%) had daily radiology services. Between 1991 and 1994, 12 hospitals gained at least once-a-week radiology services, but 24 lost all radiology services. Teleradiology availability more than doubled during the three years. Radiology technology has diffused widely into rural communities in this region of the United States at differing rates for large and small hospitals. Radiologists are available to these hospitals only 46 percent of the days each year, with more days of availability in the larger hospitals and fewer days in the smaller hospitals. Teleradiology capability is increasing more rapidly in the larger hospitals that have radiologists more readily available.     

Testing the HMO competitive strategy: an analysis of its impact on medical resources

Competitive approaches to health care reform, including managed competition, are hypothesized to reduce health care expenditures and the resources devoted to medical care. Empirical evidence has been limited. The short- and long-run effects of an experiment closely resembling managed competition are analyzed. We examine effects on hospitals, technology diffusion, physicians, and health insurance premiums. The strategy reduces capital in hospitals, has minor effects on physicians and technology, and has only initial effects on average premiums.     

Hospital adoption of medical technology: an empirical test of alternative models.

OBJECTIVE. This study examines hospital motivations to acquire new medical technology, an issue of considerable policy relevance: in this case, whether, when, and why hospitals acquire a new capital-intensive medical technology, magnetic resonance imaging equipment (MRI). STUDY DESIGN. We review three common explanations for medical technology adoption: profit maximization, technological preeminence, and clinical excellence, and incorporate them into a composite model, controlling for regulatory differences, market structures, and organizational characteristics. All four models are then tested using Cox regressions. DATA SOURCES. The study is based on an initial sample of 637 hospitals in the continental United States that owned or leased an MRI unit as of 31 December 1988, plus nonadopters. Due to missing data the final sample consisted of 507 hospitals. The data, drawn from two telephone surveys, are supplemented by the AHA Survey, census data, and industry and academic sources. PRINCIPAL FINDING. Statistically, the three individual models account for roughly comparable amounts of variance in past adoption behavior. On the basis of explanatory power and parsimony, however, the technology model is "best." Although the composite model is statistically better than any of the individual models, it does not add much more explanatory power adjusting for the number of variables added. CONCLUSIONS. The composite model identified the importance a hospital attached to being a technological leader, its clinical requirements, and the change in revenues it associated with the adoption of MRI as the major determinants of adoption behavior. We conclude that a hospital's adoption behavior is strongly linked to its strategic orientation.     

Substitution of magnetic resonance imaging for computed tomography. An exploratory study.

Despite the importance of understanding factors related to physician adoption and use of diagnostic technologies, relatively few studies have been published. Results of a two-year study of the adoption of magnetic resonance imaging (MRI) and its substitution for computed tomography scanning (CT) are presented. The literature on physician adoption and use of technology is used to provide a framework for this study. Differences in adoption and substitution among medical specialties, early versus late adopters, and high versus low users of MRI are examined. Results show that neurologists and internists more rapidly adopt MRI and substitute it for CT than do orthopedists and other surgical specialists. Referral of higher numbers of patients is the best predictor of more rapid substitution. Physicians who were late adopters more quickly substituted MRI for CT. The cost and social implications of empirical versus "ideal" substitution rates are discussed along with how various regulatory, technology assessment, and financial strategies influence substitution. The role of individual physicians, radiologists, and specialty societies in determining substitution rates is also discussed.     

制度变迁视角下完善医师多点执业的思考

作为促进医师流动、优化卫生资源配置的重要举措,多点执业被寄予厚望,但实践中多点执业却遭受冷遇。从制度变迁视角来看,遇冷的根本原因在于既有制度和思维中存在的路径依赖：首先,政府管制体制具有强大的制度惯性将医师锁定在医院中,医师多点执业的合法性与合理性并不统一。其次,医院之间竞争的白热化,多点执业对于医院和医师责权利分配格局统一性的挑战使医院对多点执业冷淡。再次,思维观念中的求稳倾向与追求利益的欲求,使医师对多点执业采取观望态度。因此,多点执业的制度变迁需要加快政府制度创新,为多点执业解锁,实现合法性与合理性的统一;转变医院运行逻辑,扼制逐利动机,推行多点执业契约管理;转变医师思维模式,正视医师利益需求,构建多点执业激励机制。     

Straight talk new approaches in healthcare. The outpatient market: protect important market share

Hospitals are facing competition from myriad freestanding players in the outpatient market. It's a fight hospitals can't afford to lose because they often use outpatient profits to cover losses in other service lines. Indeed about 60% of the average hospital's operating margin depends on outpatient revenues. In this session of Straight Talk, we examine how hospitals can build and finance outpatient services with physicians, increasing their competitiveness in increasingly competitive markets.     

Supplier-induced demand for newborn treatment: Evidence from Japan

We estimate the degree of supplier-induced demand for newborn treatment by exploiting changes in reimbursement arising from the introduction of the partial prospective payment system (PPS) in Japan. Under the partial PPS, neonatal intensive care unit (NICU) utilization became relatively more profitable than other procedures, since it was excluded from prospective payments. We find that hospitals have responded to PPS adoption by increasing NICU utilization and by more frequently manipulating infants’ reported birth weights which in large part determine their maximum allowable stay in the NICU. This induced demand substantially increases the reimbursements received by hospitals.     

The wide distribution of CT scanners in Japan

Computerized tomography (CT) scanners have been widely distributed throughout Japan since 1975, with the total number reaching 2120 in December 1982. This figure is larger than that of all European countries. Furthermore, the number of CT scanners per million population, Japan exceeds the United States. An investigation to explain the reasons for this rapid increase of CT in Japan with comparisons between Japan and the United States is presented. Uniquely 'Japanese' characteristics may explain the diffusion of CT as follows: the government has no explicit policy to control the adoption of CT. CT has been widely distributed, not only to the large public hospitals, but also, to smaller private hospitals. CT is frequently adopted without assigning additional skilled personnel. Japanese manufacturers have produced low-price CT in addition to developing an active marketing campaign.     

医保支付方式对医生行为约束的路径分析

中性的医保支付方式既可以实现医保资金的成本效益,又可以使医生在医疗服务中遵循患者健康收益最大化原则。由于医生代理人职能的不完善,完全的预付费用和按费用支付都无法抑制医生的目标收入和诱导需求。以第三方支付为主的基本医疗服务中,采取以诊疗效率相关的预付费用为基础,混合以边际成本小于边际费用及平均费用支付的支付,不仅可以弥补医生服务成本,还可以约束医生诱导需求等行为,完善医生代理人作用,使医保支付趋近中性。     

Report: CPOE adoption a long-term process

Report may be first to focus on community hospitals. Key measure in hospital selection was physician adoption rate. Community hospitals face additional challenges since physicians are not employees.     

Physicians' responses to their changing environment

The loss of physician autonomy, the changing shape of physicians' practices, and efforts to control the cost of health care have left American physicians increasingly dissatisfied with the U.S. health care system. A survey of 300 office and hospital-based physicians shows 59 percent favor reform of the U.S. system; only 31 percent favor retaining the current system. Doctors face increased competition for patients (the supply of physicians has increased three times faster than the population), reduced autonomy because of intervention by government and other third party payers, pressure from patients to provide unnecessary care including expensive new technology, and increased cost containment. Yet a majority of physicians believe the causes of rising health care costs are patient demand for services and the current medical malpractice system. A minority (23 percent) blame hospitals and physicians for rising costs.