Deconstructing Evidence Based Practice


George Orwell once said that there are some ideas that are so absurd that only intellectuals will believe them. Should we not reverse this statement when it comes to Evidence Based Practice/ Research (EBPR) so that it reads “There are some intellectuals who are so caught up in ideology that their ideas appear to make perfectly rational, common sense!?

When I first learned about EBPR, I experienced it as an imposed demand, something I must subscribe to or else… I wasn’t quite sure how to respond to its demand, but I remember feeling suspicious about it. It sounded constructed on what I could point to as some patently faulty assumptions, but I didn’t quite know how to put the assumptions together, or how to think of them.

When I discovered Ignaas Devisch and Stuart J. Murray’s We Hold These Truths To Be Self-Evident: Deconstructing Evidence Based Medical Practice, I became both curious and hopeful. Their article was published in Journal of Evaluation in Clinical Practice, 15, (2009), pages 950–954.

Abstract: Rationale,  aims and objectives  Evidence-based medicine (EBM) claims to be based on ‘evidence’, rather than ‘intuition’. However, EBM’s fundamental distinction between quantitative ‘evidence’ and qualitative ‘intuition’ is not self-evident. The meaning of ‘evidence’ is unclear and no studies of quality exist to demonstrate the superiority of EBM in health care settings. This paper argues  that, despite itself, EBM holds out only the illusion of conclusive scientific rigour for clinical decision making, and that EBM ultimately is unable to fulfill its own structural criteria for ‘evidence’.

Methods: Our deconstructive analysis of EBM draws on the work of the French philosopher, Jacques Derrida. Deconstruction works in the name of justice to lay bare, to expose what has been hidden from view. In plain language, we  deconstruct EBM’s paradigm of ‘evidence’, the randomized controlled trial  (RCT), to demonstrate that there cannot be incontrovertible evidence for  EBM  as such. We argue that EBM therefore ‘auto- deconstructs’ its own paradigm, and that medical practitioners, policymakers and patients alike ought to be aware of this failure within EBM itself.

Results:  EBM’s strict distinction between admissible evidence (based on RCTs) and other supposedly inadmissible evidence is not itself based on evidence, but rather, on intuition. In other words, according to EBM’s own logic, there can  be no ‘evidentiary’ basis for its distinction between admissible and inadmissible evidence. Ultimately, to uphold this fundamental distinction, EBM must seek recourse in (bio)political ideology and an epistemology akin to faith.


There is often something sinister about familiar  concepts.  The more familiar or ‘natural’ they appear, the less we wonder what they mean; but because they are widespread and well-known, we tend to act as if we  know  what we mean when we use them. Evidence-Based Medicine (EBM) has fast become one such familiar concept; it is now among the most influential doctrines in the medical world and forms the basis of  health care theory and practice from the classroom to the clinic. But when EBM is dis- cussed and deployed, what exactly are we meant to understand by the term  ‘evidence’? If the evidence of EBM relies, in the first instance, on facts and figures derived from randomized controlled trials (RCTs) and the so-called ‘meta-analysis’ of them, should we not wonder what it means to exclude a host of seemingly subjective and non-quantifiable aspects in the field of health care? Should we not wonder,  moreover, that these aspects are presented as contrary to EBM’s mandate and to its self-understanding of what must count as ‘evidence’? What would happen to EBM if, at the heart of its assumptions, we find an intuitive – a subjective and non-quantifiable – claim upon which EBM’s  understanding of evidence is based?

This paper argues that, despite itself, EBM holds out only the illusion  of  conclusive  scientific  rigour  for  clinical  decision making,  and  that  EBM  ultimately is  unable to  fulfil its  own requirements for ‘evidence’. We suggest that EBM’s strict distinc- tion between admissible evidence (based on RCTs) and other sup- posedly inadmissible evidence is not itself based on evidence, but rather, on intuition. In other words, according to EBM’s own logic, there can be no ‘evidentiary’ basis for its  distinction between admissible and inadmissible evidence; in practice, that which dis- tinguishes the RCT from other forms of evidence ultimately comes down to a matter of belief, not evidence. We focus on the paradigm of EBM’s truth claim, the RCT, to demonstrate that there cannot be incontrovertible evidence for EBM as such. We argue that EBM therefore ‘auto-deconstructs’ its own paradigm, and that medical practitioners, policymakers, and patients alike ought to be aware of this aporia within EBM itself.  Indeed, according to its own lights, EBM is forced to exclude almost all aspects of health care as most care does not rely on RCT outcomes or on the narrowly prescriptive care that the interpretation of these outcomes would dictate. Our deconstructive analysis of EBM draws on the work of the French philosopher, Jacques Derrida  [1]. Contrary to many academic treatments of EBM, we are not pleading for an integration of other perspectives into EBM or for a movement ‘beyond EBM’ [2,3]. Rather, this paper represents an effort to open up new ways of  looking at health care by paying particular attention to those questions that EBM leaves aporetic.

Basic assumptions

One of the standard definitions of EBM reads as  follows:  ‘the conscientious, explicit, and judicious use of current best evidence in making decisions about the care of individual patients’ [4]. At first glance, this definition of medical practice is neither original nor  controversial. But  does  it  accurately describe the  clinical reality of evidence-based practice?

We suspect that, despite its name, the main thrust of EBM does not concern the search for best evidence.  After all, how many physicians ‘conscientiously’, ‘explicitly’ and ‘judiciously’ refuse the best available evidence in their decision making? Rather, EBM is characterized by the belief that all health care providers – practitioners, policymakers, physicians, physiotherapists, etc. – should base their medical decisions on specific scientific findings, namely, evidence obtained from RCTs.  Within the EBM paradigm, the RCT is believed to offer the most valid form of evidence, effectively denigrating or altogether excluding other crucial aspects of decision  making in the patient–physician relationship, such as patient values, the physician’s clinical experience and others [2,5]. According  to  EBM,  decisions  that  are  not  based  on  results obtained from the meta-analyses of  RCTs are called intuitive, guesswork practice, mere  opinion or taken-for-granted assumptions [6]. According to this logic, EBM claims to produce better health care outcomes than a practice based on clinical experience. But is EBM really the best medicine we can get?

In a very short period of time, EBM’s narrow understanding of evidence has become widespread,  familiar and ‘naturalized’ to such an extent that it is now difficult to pose questions concerning evidence in terms other than those sanctioned by EBM itself. In this  respect,  EBM is  hegemonic. The  more  EBM proponents repeated their ideas during the 1990s, the more people began to believe in it and started to act according to its principles. Today, in some countries EBM is so influential  that ‘evidence’ will never sound the same again. But to  believe that the popularity of a movement is sufficient evidence of its truth is to commit a logical fallacy. Perhaps  the most remarkable thing about the evidence- based movement in health care (medicine, nursing and the health sciences nexus in general) is that to date there is still no  direct RCT-evidence to support the basic assumptions of EBM [7]. This is all the more remarkable in that this fact is scarcely mentioned either by practitioners or theorists in the EBM field itself. As Brian Haynes writes:

“A fundamental assumption of EBM is that practitioners whose practice is based on an understanding of evidence from applied health care research will provide superior patient care compared with practitioners who rely on understanding of basic mechanisms and their own clinical experience. So far, no convincing direct evidence has shown that this assumption is correct” [8].

Moreover, no studies of quality exist to demonstrate the superior- ity of EBM in health care settings [9].

If no direct evidence supports what we might call the ‘surplus value’ of EBM compared with other kinds of evidence, in short, if EBM fails according to its own structural criteria, is this not a problem for the paradigm itself? Apparently, this does not seem to be the case,  which points to other, non-quantifiable investments in the ‘truth’ of EBM by those who support it. Incredibly, some advocates of EBM do not believe that EBM’s lack of evidence should even pose a problem. The initial  manifesto of the Evidence-Based  Medicine  Working  Group  goes  so  far  as  to suggest that the lack of evidence is evidence in itself, this ‘evidence’ being so ‘self-evident’, it seems, that to question it would be foolish:

The proof of the pudding of evidence-based medicine lies in whether patients cared for in this fashion enjoy better health. This proof is no more achievable for the new paradigm than it is for the old, for no long-term randomized trials of traditional and evidence-based medicine are likely to be carried out [10].

We must add that it is not simply that no RCTs are likely to be carried out, as the manifesto states, but such studies could never be carried out. How would an RCT, by definition based in quantitative methodologies, measure the ‘enjoyment’ or ‘better health’ that EBM is supposed to deliver? Qualitative studies, of which there are many, must be rejected immediately on the basis of faulty evidence.

According to its own logic, then, there could be no ‘evidentiary’ basis for EBM’s claim that it is the best. For a paradigm that makes so much of the distinction between old ‘intuitive’ medical practices and new ‘scientific’ ones, this is most shocking. As Henry et al. write:

“evidence-based medicine cannot accommodate concepts that resist quantitative analysis and thus reinforces and formalizes clinicians’ tendency to dismiss concepts that resist explicit analysis as unimportant or inscrutable” [2].

Consequently, under the guise of EBM, medicine not only comes to resist non-quantitative analyses, but it becomes  a travesty of science by systematically dismissing concepts and evidence that cannot explicitly be represented by EBM’s terminology. Here, the concepts of ‘health’ and ‘illness’ themselves would be deemed unimportant or inscrutable, and the general purpose of what we call  medicine would,  like the proverbial baby,  be thrown out with the bathwater. Evidence, in the full sense of the term – the ‘old-fashioned’ sense, perhaps – is soon replaced by a cipher, a symbol or character that has no intrinsic value, but that stands in for a value according to its sanctioned place in the system.

The E of evidence is surprisingly the most opaque concept of the EBM paradigm. What ought we to mean when we consider some- thing as ‘evidence’, and how is its evidentiary nature deciphered? Is it the result of an observation, is it a fact, or is it the truth? Evidence  cannot  simply  be  described  as  ‘empirical’ because reading this text or eating a banana is as empirical as any RCT. Sometimes it is said that, above all else EBM is  ‘critical’ [11], as if researchers gathering and analyzing qualitative data were uncritical. But this is to misunderstand the meaning of critique. Others call the evidence of EBM ‘exact’, and yet we cannot imagine any scientist who purposefully looks for inexact proofs of a  thesis. What remains as EBM’s distinguishing feature is  its commitment to quantity and quantification, and it is here that we grasp the meaning of ‘evidence’ within the EBM paradigm. This is such a narrow and strict definition of evidence that some  EBM advocates have claimed that before EBM existed, health care was not based on evidence at all. Although the Evidence-Based Medicine Working Group speaks of  individual patients who are supposed to ‘enjoy better  health’, and while Sackett et al. mention patient values and the need for qualitative research [12], these are empty  rhetorical gestures that belie the fact that, for them, evidence obtained through the measurement of observable phenomena is the only form of evidence considered  worthwhile [13]. Nevertheless, only one type of evidence is expressed by quantity, and it has yet to be proven that EBM’s will to quantify results in better health care  practice. The E of EBM therefore acts as the authoritative  cipher,  the  synonym, for evidence in general: E = truth = reality.

A Deconstructive Reading of the ‘E’ of Evidence.

Evidence-Based Medicine is committed to the belief that evidence ‘speaks  for  itself’,  as  if  there were  a  one-to-one  relationship between truth and EBM’s own idiosyncratic  representation of reality. The E in EBM means that not only is ‘evidence’ true, but also, according to a naïve  realism, that the scientist has direct access to this truth, despite the fact that human beings are social, historical  and  political  creatures  –  and  that  these  limitations prevent a God’s-eye view. The truth as such is never self-evident [14]. Evidence and truth are not unmediated; there is always and necessarily a moment of  interpretation  because their terms are always and  necessarily situated. Even when evidence is represented numerically as quantity, such data appear for us, and are meaningful, by virtue of our shared social, historical and political world, which anchors these terms, providing them their essential context. And there are countless other factors that will influence how ‘evidence’ – supposedly neutral and objective – appears for us at all, how evidence is both contingent and intersubjective: economic factors, religious convictions and ethical values, to  name just a few. These factors do not just figure in the ways that evidence is used or applied, which is to say, the contextual and necessarily human effects of evidence, but more radically still, these factors will constrain how – or even whether – evidence will appear at all, whether it will appear as self-evident or will be discounted or even fade from view because it is not familiar or ‘natural’ according to current conventions.

Thus, evidence always and necessarily relies upon unquantified and unquantifiable judgments. Now, if the EBM paradigm needs these kinds of judgments, interpretations, clarifications or other kinds of evidence in order to function, is it not the case that the paradigm itself must seek recourse in the very ‘intuition’  that it officially disavows? An honest assessment of the evidence would necessitate the ongoing interpretation of both how evidence appears in the first place and the myriad effects of these interpretations as they are extended to the human lifeworld, generating their own set of effects, in turn – all of which are them- selves a form of evidence in need of interpretation and evaluation. Consider an RCT for an extremely expensive drug that promises better outcomes for a disease like diabetes. First, we must take into account the conditions that enabled this research – conditions that are  never  themselves  neutral  or  objective.  Who  funded  this research, for example, and what are their motivations and investments? But more than this, we must consider the multiple effects of this RCT as the data are figured in the human lifeworld and are subject to interpretation and evaluation there. What if the use of this particular drug never becomes a ‘best practice’ because health insurance agencies refuse to pay the high cost of this treatment? A political and economic and social battle may ensue, and the terms of this  debate will probably take the form of a quantified cost– benefit analysis, according to  utilitarian principles.

Even  still, ‘intuition’ will play its part behind the scenes. If a patient’s health insurance provider refuses to fund this treatment, it is because an intuitive bureaucratic threshold has been crossed in the insurance industry itself: perhaps, paying for this drug will cut too much into profits. In the end, what counts as ‘too much’ will probably not be quantifiable. If  we were to try to make such decision making explicit, we would likely find competing spheres of interest where economic data butts up against what we might call the  ‘social good’ and ‘ethical values’ pertaining to health and illness. No RCT will help us here; indeed, we shall find that the original RCT in question is meaningless unless it is set within this wider context – and that this context will rely on terms that are incommensurable with the principle of quantity that governs the RCT paradigm.

Here we have begun to make use of the work of Jacques Derrida and his concept of deconstruction [1]. Deconstruction works to lay bare, to expose the ways in which competing claims, like those above, are adjudicated. In particular, it works in the name of justice to bring to light what has been hidden from view. To explain the way  deconstruction works, it will help to look at an  example. Consider for a moment a fundamentalist religious sect that openly condemns modern technology because it  is thought to destroy religious integrity and the religious way of life. When this group uses  modern  technology,  such  as  the  Internet,  to  spread  its message, it  necessarily makes use of the very thing that it condemns or forbids. The gesture is self-contradictory. As  Derrida would say, at this moment the fundamentalist group deconstructs or dismantles its own point of view, possibly undermining its own moral authority. Here, in order to institute a religious society that would be distinct from the technological society that it condemns, the group is nevertheless inextricably bound to the very society it disavows and seeks to destroy. If this contradiction is sustainable within a religious worldview, it is only by virtue of an authority that commands: ‘do as I say, not as I do’.

Our example is an imperfect analogy, although it is instructive. If the structure of authority and if contradiction (some would say, hypocrisy) are the essence of faith and religious life, they ought not to be tolerated in the sciences. However, when we submit EBM to a deconstructive analysis, we find a system that staggers under the weight of its own edicts, a system that, in order to sustain such self-contradiction, can only be described as ‘faith-based’. Here we could apply the terminology of Ernest House  and declare that EBM is a ‘methodological fundamentalism’ [15]. By deconstruct- ing the ‘self-evidentiary’ character of truth and evidence, we find that  EBM  cannot  refuse  what  it  pretends  to  exclude:  non- quantifiable evidence. Any exclusion of such evidence can only happen in a non-evidence-based way, which means that EBM must rely on precisely that which it hopes to exclude.

Every RCT – the gold standard of EBM – artificially isolates one or a few variables from what it studies. As Tonelli, Porta and others have argued, medical reality is far more complex than the artificial world of an RCT. Thus, we must question not only how to use the results of RCTs  in medical practice, but how to choose between conflicting sorts of evidence [3,16,17]. As Henry  et al. rightly stipulate, the Users’ Guides give no rules governing when its hierarchy should shift, except that  answering these difficult questions requires ‘deep understanding of the evidence’ [2]. The call for ‘deep understanding’ and an appeal to non-quantifiable or otherwise ‘intuitive’ knowledge is indeed crucial in medical practice.  However,  EBM  presupposes  a   one-to-one  relationship between evidence and decision as if medical reality were immediate and transparent in  itself. How should we quantify clinical judgment,  observation, conversation and other inherently non- quantifiable aspects, all of which require interpretation and judgment? As Tonelli has argued, clinical decisions  are  multiplex, drawing on empirical evidence, experiential evidence, pathophysiologic rationale, individual patient  values and preferences, and system features, among others [3]. In the face of these embodied, human  considerations, there is reason to interrogate what Ross et al.  characterize as  the  inevitably  normative  stranglehold of EBM [18]. EBM’s failure to exclude all of these aspects  – and its inability to account for them in its own decision-making processes – demonstrates how  EBM  deconstructs itself,  how  it  fails  to operate according to its own norms. This makes of EBM a text- book example for deconstruction: what is used as EBM’s paradigmatic method of closure turns out to be found, ultimately, at the heart of EBM itself. In other words, to uphold its own paradigm, EBM appeals to a  knowledge that is systematically forbidden, something from outside. Its much-lauded distinction between ‘evidence’ and ‘intuition’ is based on intuition itself,  thereby  profoundly discounting EBM as a new and more rigorous ‘science’. It turns out that EBM has little claim as a new and different type of medical ‘evidence’, although it works diligently to cover up this fact, conveniently overriding its own principles. How, then, should we assess EBM’s moral imperative to use EBM in clinical practice? What authority is at work here, and how can EBM provide ‘evidence’ for clinical decision making when it cannot  present evidence for the value of this evidence, evidence for why – and how – certain forms of evidence are deemed non-evidentiary?

The Scientific Subject  of EBM

Our deconstructive analysis has focused thus far on the paradigmatic underpinnings of EBM. In this final section, we take EBM’s objectives into account, looking at the  effects of the EBM dis- course. Consider once again the definition of EBM cited above:

‘the conscientious, explicit, and judicious use of current best evidence in making decisions about the care of individual patients’ [4]. Here, EBM is founded ostensibly not only upon a strong plea for evidence, but on the best care for individual patients. It is an attempt to deal with the old, paternalistic face of medicine, when doctors fell  back upon their own clinical authority (experience, clinical knowledge) to decide what was best for the patient, presumably independent of what the ‘evidence’ told them to do.

Evidence-Based Medicine is meant to be used as a  powerful instrument to judge between medicine based in ‘evidence’ and old-fashioned ‘intuitive’ medicine – as if the binary between ‘evidence’ and ‘intuition’ were itself clear and self-evident. Above, we have sought to deconstruct this binary, and have pointed to some ways in  which these categories are mutually implicated within EBM itself. Of course, EBM must deny the myriad ways that it relies on intuition; and so the critique of EBM is often met with the rhetorical gesture that such criticism is ‘unscientific’, or that critics are irrationally opposed to ‘progress’, that critics can only support an ad hoc system that is tantamount to ignorance and ‘guesswork’ [6]. But who, we might ask, is the ‘conscientious’ clinician who makes ‘explicit’ and ‘judicious use of current best evidence’? In philosophical  jargon, we might say that evidence itself is the ‘subject’ of EBM: the evidence itself ‘acts’, as the ‘agent’ of care, supplanting the individual with a system and, in the worst case, abrogating the clinician and the patient alike  of their individual responsibility to assure the best health care. As long as the clinician follows evidence-based best practices, he or she is indemnified and is imagined to have acted with due diligence. As Maya Goldenberg points out:

“EBM’s ability to guide healthcare decision-making by appealing to ‘the evidence’ as the bottom line is attractive to many because it proposes to rationalise this complex social process. Yet it does so through the positivistic elimination of culture, contexts, and the subjects of knowledge production from consideration, a move that permits the use of evidence as a political instrument where power interests can be obscured by seemingly neutral technical resolve” [19].

In EBM, evidence is installed as the ‘subject’, a kind of scientific god – a god who is not omniscient, perhaps, but one who is believed to have weighed all relevant  factors before issuing a decision. Such ‘technical resolve’ is falsely thought to be objective and value-free; complex social processes are effaced, and we have opened the door to a covert political instrumentalization. When the ‘relevant factors’ include only a narrow and reductive  view on reality, when they focus so fixedly on the  presumably objective data of RCTs, it is difficult to conclude that such an agenda will systematically empower  the individual patient or ensure better care. After all, the RCT neither starts from nor concludes with an individual;  data  are  gathered,  and  the  result  is  a  statistically ‘average patient’ who may or (more likely) may not coincide with the creatures of flesh and blood that we are. In this sense, EBM is a biopolitical paradigm, a political venture that treats the lives of populations, rather than individuals. As Foucault warns, here, indi- vidual lives become ‘regularized’ through ‘a technology in which bodies are replaced by general biological processes’;  individual life, he continues, becomes ‘species-life’ [20].

Advocates of EBM may use liberal words like ‘conscientious’ and ‘judicious’, but this is misleading because in EBM there is no unitary subject, no single  authority or scientist behind EBM’s decision-making directives. EBM would have us believe that these directives flow fully formed from the evidence itself, although it is important to note that evidence has already been worked over, it is part of a vast network that includes RCTs, meta-analysis, funding bodies, pharmaceutical  corporations, the insurance industry and public  policymakers, to name just a few – in short, a ‘complex social process’ the intricacies of which are collapsed into the E of evidence, a cipher for scientific authority, one that pays lip-service to the ‘conscientious’ and ‘judicious’ use of evidence, but which ultimately installs the very familiar old figure of medical paternalism. It is an authority that seems to have a kinder face, but it is perhaps all the more sinister for its dissimulation, cloaking itself in the depersonalized mantle of better outcomes, patient care and the self-evidentiary ‘science’ of evidence. Thus, in an utterly surreal twist,  in EBM medical decisions are  made  in the absence of anyone who decides – no ‘me’, or ‘you’, or ‘us’. We do not, we cannot, speak when the evidence is thought to speak for itself and for us.


‘We hold these truths to be self-evident’ – this phrase  captures what for EBM amounts to a founding principle.  For EBM, the so-called ‘truth’ of the matter is not open to debate; EBM appeals, instead, to what we might call a scientific nationalism, effectively gathering together a  community of scientists and defining the terms of their inclusion and the terms of their practice. Those who question too much – or in the wrong way – are denied full citizenship. ‘We hold these truths to be self-evident’ – unlike the US Declaration of Independence, the EBM manifesto is not in itself revolutionary.  Here,  we  might  once  again  cite  Foucault, who remarks, ‘we still have  not cut off the head of the king’ [21]. Instead, EBM aligns itself with political victories that have already been won, appealing to ‘the Laws of Nature and of Nature’s God’ ‘that all men are created equal, that they are endowed  by  their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness’. Here, in the Declaration of Independence, we read of  fundamental rights claims that have today  become  socially  and  politically  self-evident,  no  longer subject to serious debate. In deconstructing the rhetorical force of EBM, we find that its claims are founded in similarly intuitive and familiar political attitudes that have been smuggled into scientific and epistemological discourse. The  political dimension is, then, duly hidden. Thus,  EBM  declares itself victorious through an appeal to intuition and to the emotions – an appeal that is dissimu- lated as scientific rigour and epistemological truth. In this respect, EBM is a scientific and epistemological simulacrum – something that  appears  only  to  the  extent  that  its  founding  principles disappear.


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21.  Foucault, M. (1990) History of Sexuality, Volume 1: An Introduction. New York: Vintage.


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