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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">In recent years&#44; the GRADE system &#40;Grade of Recommendation&#44; Assessment&#44; Development and Evaluation&#41; has been utilized in the publication of guidelines and recommendations&#44; mostly concerning treatment&#44; both with drug and non-drug therapies in different areas of medicine&#46;<a class="elsevierStyleCrossRefs" href="#bib0130"><span class="elsevierStyleSup">1&#8211;3</span></a> Very recently&#44; a number of clinical practice guidelines in the field of rheumatology have employed this system&#44; including guidelines dealing with polymyalgia rheumatica&#44; rheumatoid arthritis and fibromyalgia&#44; among others&#46;<a class="elsevierStyleCrossRefs" href="#bib0145"><span class="elsevierStyleSup">4&#8211;8</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Evidence-based medicine facilitates headway in this uncertain terrain and aid in clinical decision making&#46; Evidence-based guidelines have undergone a profound transformation in recent years&#46; There are a number of systems to evaluate scientific evidence and assign different grades of recommendation&#46; However&#44; these systems have certain drawbacks&#44; as they do not include a balance of risks and benefits&#44; nor do they take into account resource use or costs&#44; and the fact that they were mostly developed by consensus of expert opinion and have not been validated&#46; Clinical practice guideline panel members can have strong opinions or academic biases concerning a specific area in which they have clinical experience or other biases with respect to interactions with academic colleagues or coworkers in the industry&#46;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">9</span></a> In an attempt to address these problems&#44; GRADE requires systematic and pragmatic searches of the literature and summarizing the evidence&#44; ideally based on grouped treatment effects and produced by panel members with no conflicts of interest or independent methodologists&#46; The latter helps to ensure an impartial and reproducible evaluation of the literature addressing a specific clinical question&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">The GRADE working group is a multidisciplinary international collaboration of experts in developing a common&#44; transparent and sensible system for rating quality of evidence and the strength of recommendations&#46;<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">10</span></a> The GRADE system has been adopted by more than 80 agencies and organizations recognized worldwide&#44; such as the World Health Organization &#40;WHO&#41;&#44; the Cochrane Collaboration Group&#44; the United Kingdom National Institute for Health&#44; and the National Institute for Health and Clinical Excellence &#40;NICE&#41;&#44; among others&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">In the development of GRADE&#44; the authors considered a wide range of clinical questions&#44; including diagnosis&#44; screening&#44; prevention and treatment&#46; To go from a generic clinical question to one specifically formulated in such a way that it facilitates literature searches and the drafting of recommendations for each question&#44; the method referred to as Patients &#8211; Intervention &#8211; Comparison &#8211; Outcome &#40;PICO&#41; was preferred&#46; On drawing up the clinical questions in PICO format&#44; the issue is specifically defined&#44; without ambiguity&#46; Moreover as each type of question corresponds to a type of study in which the design is suitable for the response&#46; The format aids in doing a literature search&#46;<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">11</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">The advantages of the GRADE approach are that it&#58; &#40;a&#41; carefully considers the relative importance of the outcome variables and selects those that are most significant&#59; &#40;b&#41; provides detailed descriptions of the criteria for quality of evidence with respect to specific results or outcomes and uses explicit definitions and sequential judgements during the categorization process&#59; &#40;c&#41; separates the quality of evidence from the strength of the recommendations&#59; and &#40;d&#41; moreover&#44; considers the balance between benefits and risks&#44; patient values and resource use or costs&#46; It also provides tables showing the so-called evidence profiles &#40;EP&#41; and summary of findings &#40;SoF&#41;&#46; Finally&#44; software has been developed&#44; with its associated help files&#44; that facilitate the development of EP and SoF tables based on EP&#46;<a class="elsevierStyleCrossRefs" href="#bib0185"><span class="elsevierStyleSup">12&#44;13</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">The GRADE system is composed of 8 criteria to evaluate quality of evidence&#59; 5 of the 8 criteria are capable of downgrading quality of evidence&#44; even in a randomized controlled trial &#40;RCT&#41;&#58; risk of biases&#44; inconsistency of the results across studies&#44; indirectness&#44; imprecision and publication biases&#46;<a class="elsevierStyleCrossRefs" href="#bib0195"><span class="elsevierStyleSup">14&#44;15</span></a> For example&#44; a RCT conducted with inadequate blinding of the sequence and with a high rate of dropouts should not be considered equivalent to a well-performed RCT&#46; Moreover&#44; 3 more criteria were proposed with the potential to increase confidence&#58; a strong association without confounders&#44; the existence of a dose&#8211;response gradient based on studies without the problems of biases or imprecisions and the evidence that all the possible confounders or biases could have reduced the observed effect&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">16</span></a> Thus&#44; an observational report like a case&#8211;control study with a strong association&#44; demonstrating a dose-response gradient&#44; which in other circumstances would suggest a weak design&#44; with the GRADE approach would produce evidence at the level of a RCT&#46; The GRADE method proposes 4 levels to express the quality of evidence&#58; high&#44; moderate&#44; low and very low&#46;<a class="elsevierStyleCrossRef" href="#bib0195"><span class="elsevierStyleSup">14</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">The first GRADE criterion&#44; risk of bias or design limitations&#44; is conceptually a matter of the internal validity of a scientific study&#46; The degree of risk of bias can be determined by a careful reading of the methods section of each original study and evaluating how well the authors carried out the planning and performance of the study&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">17</span></a> There is evidence in medicine that methodological imperfections in a RCT can have an influence on the estimated effect&#44; which is usually exaggerated&#46;<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">18</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">The second criterion&#44; inconsistency of the results across the studies included in a systematic review&#44; signifies that the results deviate from one another&#44; and this naturally leads to decreased confidence in the effectiveness of the estimate&#46; If the original studies are clinically homogeneous &#40;responding to the question posed by the investigation&#41; and the methodological quality is high&#44; but the results are inconsistent&#44; then statistical analyses will probably demonstrate that there is heterogeneity in the results&#46;<a class="elsevierStyleCrossRef" href="#bib0220"><span class="elsevierStyleSup">19</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall">The third GRADE criterion&#44; imprecision or absence of direct evidence&#44; refers to any deviation from the research question of the studies included in the systematic review&#46; In cases of the absence of direct comparisons between the interventions being considered&#44; or of substantial differences between the available studies and the population&#44; the interventions or outcomes put forward in the question of interest&#44; we may find that we only have access to indirect information&#46; The use of surrogate outcomes may not be associated with the primary outcome&#46; This may cause problems of applicability&#46;<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">20</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">The fourth GRADE criterion&#44; imprecision&#44; conceptually reflects the random variation in the estimate of the outcome and is different from the internal validity&#46; If the original studies in a systematic review are clinically homogeneous and all of them have a low risk of bias&#44; it is appropriate to conduct a meta-analysis and obtain an overall estimate&#46; The 95&#37; confidence interval &#40;CI&#41; is frequently interpreted to signify that&#44; with a certainty of 95&#37;&#44; the true value of a parameter can be found within the given range&#46; The information on the width of this interval can be used as the basis for clinical inference&#46; For example&#44; this enables the conclusion that the CI have exceeded the clinically important minimal difference&#46;<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">21</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall">The fifth GRADE criterion&#44; which can reduce the confidence in the results of a systematic review&#44; is publication bias&#46; The selective report of outcomes is a matter of the internal validity of a given study&#44; and should be included in the criteria for &#8220;limitations for study quality&#8221;&#46; When individual studies are not published&#44; there can be biases in systematic reviews&#46; The existence of publication biases is one of the potential sources of risk of bias in systematic reviews&#46; The obligatory risk of registry of clinical trials has enhanced the possibilities of identifying publication bias&#46;<a class="elsevierStyleCrossRef" href="#bib0235"><span class="elsevierStyleSup">22</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">We must recognize that the system has certain limitations&#59; thus&#44; firstly&#44; the method was initially developed to respond to questions on alternative interventions&#44; especially for treatment or prevention&#44; not for risk or prognosis&#44; and it has problems with respect to diagnostic tests&#44; public health issues and health care systems&#46; However&#44; in recent years&#44; adaptations of this method have been designed for diagnostic<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">23</span></a> and prognostic studies&#44;<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">24</span></a> which are now being used in systematic reviews&#46; Secondly&#44; although the system employs highly systematic&#44; transparent and reproducible judgements&#44; it does not completely eliminate possible disagreements in the evaluation of evidence or in deciding alternative courses&#44; given that there is always a subjective impregnation in every judgement&#46; Finally&#44; we should point out that a number of researchers analyzing complex systematic reviews have identified difficulties in applying the criteria for the evaluation of quality using GRADE in complex interventions&#46;<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">25</span></a></p></span>"
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Editorial
GRADE system, systematic and transparent evaluation
Sistema GRADE, evaluación sistemática y transparente
Claudia Mendoza Pintoa,b, Mario García Carrascoa,b,.
Corresponding author
mgc30591@yahoo.com

Corresponding author.
a Unidad de Investigación de Enfermedades Autoinmunes Sistémicas, Hospital General Regional N.o 36, IMSS, Puebla, Puebla, Mexico
b Departamento de Reumatología e Inmunología, Facultad de Medicina, Benemérita Universidad Autónoma de Puebla, Puebla, Puebla, Mexico
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Evidence-based guidelines have undergone a profound transformation in recent years&#46; There are a number of systems to evaluate scientific evidence and assign different grades of recommendation&#46; However&#44; these systems have certain drawbacks&#44; as they do not include a balance of risks and benefits&#44; nor do they take into account resource use or costs&#44; and the fact that they were mostly developed by consensus of expert opinion and have not been validated&#46; Clinical practice guideline panel members can have strong opinions or academic biases concerning a specific area in which they have clinical experience or other biases with respect to interactions with academic colleagues or coworkers in the industry&#46;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">9</span></a> In an attempt to address these problems&#44; GRADE requires systematic and pragmatic searches of the literature and summarizing the evidence&#44; ideally based on grouped treatment effects and produced by panel members with no conflicts of interest or independent methodologists&#46; The latter helps to ensure an impartial and reproducible evaluation of the literature addressing a specific clinical question&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">The GRADE working group is a multidisciplinary international collaboration of experts in developing a common&#44; transparent and sensible system for rating quality of evidence and the strength of recommendations&#46;<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">10</span></a> The GRADE system has been adopted by more than 80 agencies and organizations recognized worldwide&#44; such as the World Health Organization &#40;WHO&#41;&#44; the Cochrane Collaboration Group&#44; the United Kingdom National Institute for Health&#44; and the National Institute for Health and Clinical Excellence &#40;NICE&#41;&#44; among others&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">In the development of GRADE&#44; the authors considered a wide range of clinical questions&#44; including diagnosis&#44; screening&#44; prevention and treatment&#46; To go from a generic clinical question to one specifically formulated in such a way that it facilitates literature searches and the drafting of recommendations for each question&#44; the method referred to as Patients &#8211; Intervention &#8211; Comparison &#8211; Outcome &#40;PICO&#41; was preferred&#46; On drawing up the clinical questions in PICO format&#44; the issue is specifically defined&#44; without ambiguity&#46; Moreover as each type of question corresponds to a type of study in which the design is suitable for the response&#46; The format aids in doing a literature search&#46;<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">11</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">The advantages of the GRADE approach are that it&#58; &#40;a&#41; carefully considers the relative importance of the outcome variables and selects those that are most significant&#59; &#40;b&#41; provides detailed descriptions of the criteria for quality of evidence with respect to specific results or outcomes and uses explicit definitions and sequential judgements during the categorization process&#59; &#40;c&#41; separates the quality of evidence from the strength of the recommendations&#59; and &#40;d&#41; moreover&#44; considers the balance between benefits and risks&#44; patient values and resource use or costs&#46; It also provides tables showing the so-called evidence profiles &#40;EP&#41; and summary of findings &#40;SoF&#41;&#46; Finally&#44; software has been developed&#44; with its associated help files&#44; that facilitate the development of EP and SoF tables based on EP&#46;<a class="elsevierStyleCrossRefs" href="#bib0185"><span class="elsevierStyleSup">12&#44;13</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">The GRADE system is composed of 8 criteria to evaluate quality of evidence&#59; 5 of the 8 criteria are capable of downgrading quality of evidence&#44; even in a randomized controlled trial &#40;RCT&#41;&#58; risk of biases&#44; inconsistency of the results across studies&#44; indirectness&#44; imprecision and publication biases&#46;<a class="elsevierStyleCrossRefs" href="#bib0195"><span class="elsevierStyleSup">14&#44;15</span></a> For example&#44; a RCT conducted with inadequate blinding of the sequence and with a high rate of dropouts should not be considered equivalent to a well-performed RCT&#46; Moreover&#44; 3 more criteria were proposed with the potential to increase confidence&#58; a strong association without confounders&#44; the existence of a dose&#8211;response gradient based on studies without the problems of biases or imprecisions and the evidence that all the possible confounders or biases could have reduced the observed effect&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">16</span></a> Thus&#44; an observational report like a case&#8211;control study with a strong association&#44; demonstrating a dose-response gradient&#44; which in other circumstances would suggest a weak design&#44; with the GRADE approach would produce evidence at the level of a RCT&#46; The GRADE method proposes 4 levels to express the quality of evidence&#58; high&#44; moderate&#44; low and very low&#46;<a class="elsevierStyleCrossRef" href="#bib0195"><span class="elsevierStyleSup">14</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">The first GRADE criterion&#44; risk of bias or design limitations&#44; is conceptually a matter of the internal validity of a scientific study&#46; The degree of risk of bias can be determined by a careful reading of the methods section of each original study and evaluating how well the authors carried out the planning and performance of the study&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">17</span></a> There is evidence in medicine that methodological imperfections in a RCT can have an influence on the estimated effect&#44; which is usually exaggerated&#46;<a class="elsevierStyleCrossRef" href="#bib0215"><span class="elsevierStyleSup">18</span></a></p><p id="par0040" class="elsevierStylePara elsevierViewall">The second criterion&#44; inconsistency of the results across the studies included in a systematic review&#44; signifies that the results deviate from one another&#44; and this naturally leads to decreased confidence in the effectiveness of the estimate&#46; If the original studies are clinically homogeneous &#40;responding to the question posed by the investigation&#41; and the methodological quality is high&#44; but the results are inconsistent&#44; then statistical analyses will probably demonstrate that there is heterogeneity in the results&#46;<a class="elsevierStyleCrossRef" href="#bib0220"><span class="elsevierStyleSup">19</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall">The third GRADE criterion&#44; imprecision or absence of direct evidence&#44; refers to any deviation from the research question of the studies included in the systematic review&#46; In cases of the absence of direct comparisons between the interventions being considered&#44; or of substantial differences between the available studies and the population&#44; the interventions or outcomes put forward in the question of interest&#44; we may find that we only have access to indirect information&#46; The use of surrogate outcomes may not be associated with the primary outcome&#46; This may cause problems of applicability&#46;<a class="elsevierStyleCrossRef" href="#bib0225"><span class="elsevierStyleSup">20</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">The fourth GRADE criterion&#44; imprecision&#44; conceptually reflects the random variation in the estimate of the outcome and is different from the internal validity&#46; If the original studies in a systematic review are clinically homogeneous and all of them have a low risk of bias&#44; it is appropriate to conduct a meta-analysis and obtain an overall estimate&#46; The 95&#37; confidence interval &#40;CI&#41; is frequently interpreted to signify that&#44; with a certainty of 95&#37;&#44; the true value of a parameter can be found within the given range&#46; The information on the width of this interval can be used as the basis for clinical inference&#46; For example&#44; this enables the conclusion that the CI have exceeded the clinically important minimal difference&#46;<a class="elsevierStyleCrossRef" href="#bib0230"><span class="elsevierStyleSup">21</span></a></p><p id="par0055" class="elsevierStylePara elsevierViewall">The fifth GRADE criterion&#44; which can reduce the confidence in the results of a systematic review&#44; is publication bias&#46; The selective report of outcomes is a matter of the internal validity of a given study&#44; and should be included in the criteria for &#8220;limitations for study quality&#8221;&#46; When individual studies are not published&#44; there can be biases in systematic reviews&#46; The existence of publication biases is one of the potential sources of risk of bias in systematic reviews&#46; The obligatory risk of registry of clinical trials has enhanced the possibilities of identifying publication bias&#46;<a class="elsevierStyleCrossRef" href="#bib0235"><span class="elsevierStyleSup">22</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">We must recognize that the system has certain limitations&#59; thus&#44; firstly&#44; the method was initially developed to respond to questions on alternative interventions&#44; especially for treatment or prevention&#44; not for risk or prognosis&#44; and it has problems with respect to diagnostic tests&#44; public health issues and health care systems&#46; However&#44; in recent years&#44; adaptations of this method have been designed for diagnostic<a class="elsevierStyleCrossRef" href="#bib0240"><span class="elsevierStyleSup">23</span></a> and prognostic studies&#44;<a class="elsevierStyleCrossRef" href="#bib0245"><span class="elsevierStyleSup">24</span></a> which are now being used in systematic reviews&#46; Secondly&#44; although the system employs highly systematic&#44; transparent and reproducible judgements&#44; it does not completely eliminate possible disagreements in the evaluation of evidence or in deciding alternative courses&#44; given that there is always a subjective impregnation in every judgement&#46; Finally&#44; we should point out that a number of researchers analyzing complex systematic reviews have identified difficulties in applying the criteria for the evaluation of quality using GRADE in complex interventions&#46;<a class="elsevierStyleCrossRef" href="#bib0250"><span class="elsevierStyleSup">25</span></a></p></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Mendoza Pinto C&#44; Garc&#237;a Carrasco M&#46; Sistema GRADE&#44; evaluaci&#243;n sistem&#225;tica y transparente&#46; Reumatol Clin&#46; 2018&#59;14&#58;65&#8211;67&#46;</p>"
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