health care spending has risen at rates greater than gross domestic product in most oecd countries . in 2009 ,
average health spending reached 9.5% of gross domestic product , up from 8.8% in 20081 ( figure 1 ) . during the same time period ,
average per capita spending increased by an average of 3.8% in 2008 and 3.5% in 2009 , with public spending on health growing at an even faster rate of 4.8% and 4.1% , respectively.1 for most countries , rising health expenditure is considered an enduring challenge and one that requires a complex balancing act between cost control , affordable and equitable access to beneficial treatments , and support for innovation .
a number of factors have been identified as contributors to spending growth , including the ageing of populations , increased public demand and expectations , personal income growth , rising prices of physician and hospital services ( eg , labor costs ) , and inefficiencies in the organization and payment of care .
for example , the growth in life expectancy has had an obvious yet gradual impact on the demand for health care .
although the use of care depends ultimately on the health status of a person and not necessarily on their age cohort(s ) , elderly people use health care more often and more intensively than younger populations , with a high proportion of costs garnered at the end of life.2 longer life spans , in concert with an increase in unhealthy lifestyles , have also contributed to an increased prevalence of disease , particularly chronic conditions such as obesity , diabetes , and cancer .
greater prevalence of chronic conditions are likely to increase spending both through an increase in treated prevalence ( ie , number of cases treated ) and the cost of treatment ( ie , spending per case ) .
however , analysts often point to advances in medical technology and their diffusion across health systems as the principal driver for burgeoning expenditures.310 this paper critically examines this conjecture , based on an analysis of a broad range of existing evidence on the relationship between medical technology diffusion and health expenditure .
we strive to focus on medical devices , given the gap in the literature on their role in health expenditures , which has predominantly centered on pharmaceuticals , and because the sector has grown considerably in recent years .
not only are there substantially more medical technologies on the market , but they have grown increasingly sophisticated . the paper is structured as follows .
we first outline the methods used to review the literature , followed by a summary of the available evidence .
the paper then discusses the complexities inherent to ascertaining the impact of technology on spending , including some of the methodological challenges associated with demonstrating and quantifying this link .
based on the analysis , we close by arguing that while the impact of medical technology on rising costs is an important concern and area of inquiry , attention should also be focused on exploring whether investments in medical technology result in better value , as measured by therapeutic benefit , cost - effectiveness , and other important outcomes ( eg , quality of life , improved productivity ) in health care , and under which conditions technologies allow for the most effective and efficient use of available health care resources .
a literature review was conducted to explore the current evidence base on the relationship between medical technology and health care expenditures . unlike previous studies in this area
, we considered a wide range of literature to ensure adequate coverage of different methodological approaches and ideological perspectives for assessing this relationship .
the categories of literature included in the search and review included general and descriptive analyses , policy analyses , literature reviews , multivariate analyses , cost - effectiveness analyses , and cost impact studies of specific technologies .
key databases , including pubmed , embase , medline , and econlit , were searched to identify relevant literature .
the search terms employed to identify relevant literature included  technolog * and ( expenditure or cost ) and ( health or healthcare )  , and  medical and technolog * and ( expenditure or cost )  . to identify relevant cost - effectiveness analyses across all medical technologies would be a considerable task .
therefore , we took advantage of two previously completed systematic reviews of economic evaluations of medical devices in the cardiology and orthopedic sectors , the two most significant markets for therapeutic devices.11 in these reviews , we used the national health service economic evaluation database12 for the searches , which contains structured reviews ( abstracts ) of full economic evaluations of health care treatments and programs . in these two previously conducted studies , we employed the following search terms  cardiology  ,  cardiac rhythm management  ,  cardiovascular  ,  coronary stents  ,
implantable cardioverter defibrillators  ,  orthopaedic  ,  hip  ,  knee  ,  shoulder  ,  ankle  ,  elbow  ,  arthroplasty  , and  joint  .
all the relevant abstracts were reviewed , from both the general literature review and the review of national health service economic evaluation database . duplicate and irrelevant abstracts were identified and eliminated .
selected articles were reviewed according to a data extraction form , developed in microsoft excel , to standardize the review and facilitate subsequent analysis of the collated information .
the categories of information extraction included : basic bibliographic information ; publication year ; literature type ( eg , descriptive analysis ) ; study aims ; technologies studied ; study setting ; methods employed ; outcomes across health , costs / expenditures , and cost - effectiveness ; and , stated conclusions and implications of the study .
the information extracted was then analyzed for key themes across the domains interest ( ie , impact of medical technology on costs or spending and factors influencing this relationship , and the methodological challenges noted in measuring such linkages ) .
the majority ( 52% ) of studies were more qualitative in nature ( eg , descriptive and policy analyses , literature reviews ) , followed by cost - effectiveness ( 40% ) and multivariate ( 24% ) analyses .
in addition , the bulk of studies were published within the last ten years ( 77% ) and focused on the us ( 52% ) . with
the exception of cost - effectiveness and cost impact studies examining specific medical devices , most studies ( 52% ) examined medical technology in general , which in some cases included some combination of drugs , devices , diagnostics , or procedures .
although technological innovation is of great significance in health care13,14 and has been claimed to be a key driver of health spending , the review highlighted that research measuring the potential contributions of medical technology to rising health care costs has been relatively sparse .
one possible reason for this neglect , and the predominant reliance on more descriptive or qualitative analyses among available studies , is that technology itself and its possible implications on health expenditures are insufficiently understood .
other reasons center on the often limited data available to explore this relationship and the complexities of measuring such associations , which we discuss further below .
the available evidence that does exist suggests that , in general , new medical technology is an important determinant in rising health care expenditures . of the studies reviewed that attempted to quantify this relationship , mainly econometric studies , the overall impact ( ie , proportion of the cost increase ) ranges from approximately 25% to 75% , averaging at about 50%7,9,10,1419 ( table 3 ) . while much of the quantitative evidence indeed substantiated the cost - increasing effect of new technology overall , the broader spectrum of evidence ( eg , cost - effectiveness studies , descriptive analyses ) suggests that the relationship between technological advances and health care expenditure is not straightforward or static .
rather , it should be understood as being complex , with a wide range of potential intervening factors that change and shift the dynamic of the association , depending on the particular circumstances . for example , this relationship often differed across technologies , with some exerting more upward pressure on health care expenditure than others .
of 16 diseases ( and subgroups ) studied by scitovski20 in a case study , new technology decreased costs in eight cases , increased costs in seven , and in one case had neutral effects .
the use of  low - tech  technologies such as electrocardiography , laboratory tests , and x - rays stabilized or increased costs at a moderate pace , while the use of complex or sophisticated technologies and procedures such as cesarean section , new treatment modalities for breast cancer , and coronary bypass surgery substantially increased costs . in another case study , bryan et al21 found that technology that introduces computer - based information networks for imaging archiving increased annual hospital costs by 1.8% . a congressional budget office6 review of the available economic literature highlighted particular areas of technology advancement that has been accompanied by more spending , including revascularization for coronary artery disease , diagnostic imaging , and joint replacement .
whether a particular technology increases or decreases costs depends on whether a given technology : substitutes for an existing service ; expands the number of treatable conditions , in that it allows providers to treat conditions they previously could not treat or could not treat effectively or aggressively ; intensifies level of use of the technology for the same condition ; impacts the delivery of care ( eg , improves the capacity of the system to treat more patients ) ; broadens the definition of diseases ; and extends life , for which each patient bears ( or induces ) additional years of health care consumption.6,17,2225 for instance , with regards to increasing the indications and applications of the innovations , the initial use of imaging diagnostics ( eg , x - rays , computed tomography , magnetic resonance ) was initially targeted to specific organs and functions , but their application has extended to almost every part of the human body , resulting in increased spending.26 further , some new technologies may allow lower unit costs ( ie , treatment becomes cheaper ) or cause less discomfort or complications , thereby offering the potential for cost savings
. however , these benefits may lead to increased provision of services to persons who , without the new technology , may not have undergone a particular treatment .
therefore , when the cost savings per case are offset by the increased number of procedures , these technologies will result in increased costs in the aggregate , but will almost certainly also increase the total benefits from the care provided .
chernew et al27 found this was the case with regard to introduction of laparoscopic techniques at the beginning of the 1990s in the us .
of course , new technology can also help extend life ( in patients with life - threatening or chronic conditions ) , which may result in higher spending due to extended years of health care utilization
. however , in parallel , a given technology may also allow individuals to live those additional years with greater quality of life or in an improved health state , which could bring potential cost - savings and/or broader social benefits .
in contrast , those technologies that have a substitutive effect , thereby reducing treatment with older technology , eg , use of percutaneous transluminal coronary angioplasty ( ptca ) and coronary artery bypass grafting ( cabg ) , may facilitate reductions in spending , even if treatment expansion follows.25,26 for example , ptca outcomes improved through the introduction of coronary stents , leading to reduced occurrence of restenosis , heart attacks , emergency cabg , and mortality . consequently , the procedures had become highly substitutable with cabg and for patients with severe coronary artery disease .
while the growth of ptca resulted in higher costs , this has been offset over time by the substitution of ptca for cabg .
therefore , by metrics of costs , the diffusion of some new technologies can increase spending rapidly at first as it treats those who went without , and less rapidly over time as technology substitutes for more expensive existing treatments.28,29 moreover , the impact of technology on costs varies depending on the circumstances ( eg , patient population , placement in treatment pathway ) within which a given therapy is used .
for example , several cost - effectiveness analyses on drug - eluting stents have demonstrated that use of these devices increased per patient treatment costs compared with standard balloon angioplasty.3032 however , if used in medium - risk to high - risk patients , drug - eluting stents could be cost - neutral31,32 or even cost - saving.30 there are also organizational , economic , and social considerations that influence the link between new technology and spending and arguably interplay with the aforementioned factors .
for example , impacts on costs may be affected by how the technology is administered or impacts the delivery of care , because some innovations may lead to an increased use of medical personnel , material supplies , or training , particularly if they employ a new technique or procedure , while others may reduce staff or time requirements or shift care to less costly settings of care ( eg , inpatient to outpatient).33,34 in particular , some technologies may improve the efficiency of care delivery by reducing procedure time , length of stay , or number of hospitalizations , thereby increasing the capacity of the hospital to treat additional patients .
overall costs may rise as a result , but such outlays will likely result in improved health outcomes for a greater number of patients . finally , technological advancements may generate consumer demand for care ( and , perhaps more intense , costly services , even if not cost - effective ) , as well as the demand for insurance.17,27,35,36 at the same time , expanding insurance provides increased incentives to develop new technologies.22 some analysts maintain that such incentives contribute to long - term growth in expenditure , because the development costs of these products must be recouped by industry ( leading to higher prices).6 although much of this evidence originates from the us , barros and martinez - giralt37 also found that payment systems affect the rate of technology adoption and utilization in european systems . national procurement policies and practices
may also influence their diffusion into the health system and the costs associated with adoption .
for example , use of more centralized purchasing strategies ( eg , local or regional procurement consortiums ) or value - based purchasing in europe and elsewhere , where payment is directly linked to the quality and efficiency of a new technology , may reduce spending.38,39 in relation to this point , there are important differences between countries and their respective health systems that influence the adoption and diffusion of new technologies .
given that incentive structures differ across countries , technology influences spending differently across jurisdictions.40 lambooij et al41 assert that lower resourced countries encourage diffusion of innovations that enhance efficiency , whereas better resourced jurisdictions encourage diffusion of complex , expensive technologies .
the results of our review suggest that medical technology does have a significant role in health care expenditures , albeit a dynamic and complex one .
however , there are limitations to the methodological approaches used in the available published literature , which introduce challenges to arriving at a clear assessment of such dynamics . for example , in terms of quantifying this link , the residual approach4,10,17 can yield a reasonable indirect approximation of how medical technology relates to long - term growth in total health expenditure , but it can be sensitive to assumptions regarding the effects of other related factors ( eg , personal income , health insurance coverage , technology development ) and the dynamics between them.6,18 this frequently leads to an overestimation of the effect of technology on spending .
another common method , ie , the proxy approach,14,15 is only as good as the proxy indicator used to assimilate the impact of technology on spending .
the use of time as a proxy measure for technological change , for example , not only captures such changes , but may also encapsulate variations in policy , patient experiences , preference , and expenditures.15 another method , ie , the case study approach,25,26 is useful to explain the impact of certain medical technologies on health care costs , but there are problems of sampling and it is difficult to generalize to an aggregate or national level.6,19 consequently , most analysts using this approach have focused on the most significant conditions ( eg , prevalent , contributing to high levels of mortality or disability ) , such as heart disease .
these technical issues also characterize cost - effectiveness and cost impact analyses.4245 in addition to the limitations noted with individual approaches , there are technical issues shared across the various methods .
firstly , the results are frequently based on aggregate level data that are often subject to potential endogeneity and omit variable bias.46 secondly , as intimated above , several of these methods can depend on relatively simplified models dealing with highly complicated and interrelated parameters16 and can only arrive at conclusions about the collective effect of technology on health care spending , not on the contributions of specific technologies .
different types of technologies ( eg , drugs versus medical devices ) arguably impact health spending differently , particularly in terms of the associated changes in clinical practice that follow their adoption .
for example , a recent study47 estimated that medical devices account for a relatively small share of national health expenditures ( 3%5% ) , which have risen only slightly over the last 20 years , ie , a trend different from that of pharmaceuticals .
thirdly , across both quantitative and qualitative approaches , capturing the economic ( and social ) complexities surrounding the use of technology can be challenging , because it generally necessitates a complete understanding of the manner and magnitude of change in the clinical management pathway associated with treatment and follow - up .
this process can occur over extended periods of time , and can have varying resource costs that can be both easy and difficult to measure.48 available studies are often focused on a narrow time window and the specific duration of the life cycle for a technology .
therefore , results from studies with longer or different time periods could vary . for instance , the price of medical technologies generally decreases over time , which would not be captured in shorter - term studies or those that happen to examine a given technology(s ) close to initial launch . similarly , technological advances occur simultaneously with changes in other factors that affect health care spending , such as personal income and health financing systems , which make it difficult to identify causality reliably , and exactly how technology itself affects spending growth .
finally , current methods can not effectively demonstrate the cost impact that would result if availability of technology were reduced or eliminated . in the short - term
, cost - savings may be achieved , while limited access to technology may result in higher costs in the long term due to the presence of disease that was not adequately treated owing to reliance on older , less - effective technologies or a complete lack of viable treatment alternatives . therefore , while examining the role of medical technology in rising health expenditures is indeed an important area of inquiry , it is largely an incomplete exercise , due to some of the noted methodological issues , and also because most new technological innovations are cost - increasing .
even if a given technology increases costs , it may increase benefits by an even greater amount .
in addition , the same technology , applied in different settings , or in different groups of patients , could be cost - effective in some instances and not in others .
consequently , alongside simply examining costs , it is perhaps more productive to assess whether the additional benefits resulting from the use of the technology justify any increase in costs and under which circumstances technologies deliver greater value in health care .
that is , are the resulting spending levels reflected in more effective , cost - effective , and higher quality health care ? several studies from the review indicate that , on average , increases in spending as a result of technological advances have provided reasonable value .
for example , cutler et al49 found that from 1960 to 2000 , average life expectancy increased by 7 years , 3.5 years of which were attributable to improvements in health care . comparing the value of a year of life ( anywhere from $ 50,000 to $ 200,000 ) with the finding
that each year of increased life expectancy cost about $ 19,900 in health spending , they conclude that the increased spending , on average , had been a worthwhile investment .
similar conclusions were arrived at by cutler and mcclellan25 and skinner et al50 in examining technological innovation in cardiac care .
the former , for example , demonstrated that the use of new technology helped to increase the average coronary patient s life expectancy by one year ( valued at $ 70,000 per case ) , while treatment costs increased $ 10,000 per case ( 4.2% per year ) , for a net benefit of $ 60,000 per case .
in addition , as previously discussed , cost - effectiveness analyses of particular medical devices demonstrate value for money ( as measured by cost per quality - adjusted life year ) and in some limited cases , cost savings.30,31,42,5153 on a broader level , fuchs and sox54 surveyed physician perceptions of the importance of and value brought by various areas of technological innovation , with magnetic resonance imaging and computed tomographic scanning , angiotensin - converting enzyme inhibitors , balloon angioplasty , statins , and mammography all rated highly . before concluding , it is important to note a few limitations to this study .
firstly , while we strove to select and review only studies focused on medical technology , some studies , particularly certain types of econometric studies , looked at technology collectively .
therefore , for those studies , we were unable to distinguish the relative contribution of different types of technology ( eg , drugs versus devices ) to the proportion of spending attributed to technological innovation .
secondly , we focused our review of cost - effectiveness studies only on selected cardiology and orthopedic devices
. nevertheless , these particular sectors are arguably important markets and those most likely to have a cost impact .
major technological advances in medical science have allowed health care providers to diagnose and treat illnesses in ways that were previously impossible . in general ,
such developments have tended to increase health care spending , which has been seen as an important policy concern , especially considering ever - limited health care budgets . however , examining the link between medical technology and health expenditures is only one part of the picture . in order to understand better the dynamics between innovation and spending ,
it is important to assess whether and under what circumstances do investments in medical technology result in better value in health care . as cutler and mcclellan25 assert ,  it does not necessarily follow that technology change is therefore bad  costs of technology need to be compared with benefits before welfare statements can be made  . given the current global economic situation , it is ever more important to ensure that we are attaining good value for money from the technologies developed . to be sure , the question of whether medical technologies result in added value to the health care system is , of course , also difficult to answer .
it depends on our ability to determine the value of output from the health services sector , and placing a value on longer or better quality of life is difficult to appraise . as a starting point , much more comparative research is needed to understand better which technologies work best and are most cost - effective , and under what circumstances . indeed , as previously discussed , some of the cost - increasing effects of technology arise from inappropriate use , where new treatments are offered to patients for whom there is none to little clinical benefit .
current efforts to support comparative effectiveness research in the us and health technology assessment in europe and elsewhere may help to foster these aims .
however , it is important to note that medical technologies introduce unique technical challenges to health technology assessment or comparative effectiveness research , so assessment methods should adequately account for or be developed to accommodate such aspects.55 moreover , in addressing questions of value , such research should strive , where possible , to assess a broad range of potential benefits beyond clinical or therapeutic benefit , including value for money , higher quality of care , improved quality of life , greater efficiency in care delivery ( eg , reduced length of stay , shifting care from inpatient to outpatient settings ) , and enhanced ability to work or return to work . if the evidence generated from such research is to have an impact on health care spending , it should be used to inform policy and practice . as such , comparative effectiveness research and health technology assessment should be used to help reward and support the introduction of technologies into practice that confer therapeutic benefit and reasonable value for money , either through use in coverage and payment policies , insurance benefit design , or practice guidelines .
conversely , use of low - value interventions should be disincentivized through disinvestment or limitation on their use .
such strategies should be coupled with a greater emphasis on evidence - based delivery of care ( eg , aligning appropriate financial incentives for providers and consumers ) , which might further reduce expenditure levels if such incentives support greater use of cost - effective services.6 however , in parallel , it will be important to monitor carefully the impact of such policy levers in order to ascertain the best way to control costs without denying the benefits of new innovation .
in addition , such measures need to be coupled with other policies and practices to address some of the other drivers of health spending , including initiatives to support healthy aging and improve coordination of care for the chronically ill . finally , given our ever - limited health care resources
, it would be prudent to debate the opportunity costs of funding new ( and increasingly expensive ) technologies . even in cases where medical technologies are cost - effective ,
available resources may be better allocated to other equally or more cost - effective investments outside of the health care sector , such as the environment or education .
 health care spending has risen steadily in most countries , becoming a concern for decision - makers worldwide . 
 commentators often point to new medical technology as the key driver for burgeoning expenditures . 
 this paper critically appraises this conjecture , based on an analysis of the existing literature , with the aim of offering a more detailed and considered analysis of this relationship . 
 several databases were searched to identify relevant literature . 
 various categories of studies ( eg , multivariate and cost - effectiveness analyses ) were included to cover different perspectives , methodological approaches , and issues regarding the link between medical technology and costs . 
 selected articles were reviewed and relevant information was extracted into a standardized template and analyzed for key cross - cutting themes , ie , impact of technology on costs , factors influencing this relationship , and methodological challenges in measuring such linkages . 
 a total of 86 studies were reviewed . 
 the analysis suggests that the relationship between medical technology and spending is complex and often conflicting . 
 findings were frequently contingent on varying factors , such as the availability of other interventions , patient population , and the methodological approach employed . 
 moreover , the impact of technology on costs differed across technologies , in that some ( eg , cancer drugs , invasive medical devices ) had significant financial implications , while others were cost - neutral or cost - saving . in light of these issues , we argue that decision - makers and other commentators should extend their focus beyond costs solely to include consideration of whether medical technology results in better value in health care and broader socioeconomic benefits . 
Introduction
Materials and methods
Results
Discussion
Conclusion
Studies reviewed