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Comment to Assessment of the new CKD-EPI equation...
Comentario a Valoración de la nueva ecuación CDK-EPI...
José Escribano Serranoa, Teresa J Bautista Martínb, Alfredo L Michán Doñac
a UGC Poniente, La Línea de la Concepción, Jerez de la Frontera, Cadiz, España,
b UGC Laboratorio, La Línea de la Concepción, Jerez de la Frontera, Cadiz, España,
c Servicio Medicina Interna, Hospital SAS, Jerez de la Frontera, Cadiz, España,
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    "textoCompleto" => "<p class="elsevierStylePara"><span class="elsevierStyleBold">Dear Editor&#44; &#160;</span></p><p class="elsevierStylePara"><span class="elsevierStyleBold">&#160;</span>We read with great interest the prepublished article in your journal by Monta&#241;&#233;s et al&#46;<span class="elsevierStyleSup">1 </span>for two reasons&#46; The first&#44; due to its current nature&#59; it has only been a few months since formulas to estimate glomerular filtration rate &#40;eGFR&#41; were published&#44; based on CKD-EPI study &#40;Chronic Kidney Disease Epidemiology Collaboration&#41;&#46;<span class="elsevierStyleSup">2 </span>The second reason is that our group is working&#44; albeit more modestly&#44; along the same lines&#46; &#160;</p><p class="elsevierStylePara">&#160;In our project &#8220;Knowing Diabetes Numbers&#8221; we collected measurements of fasting plasma glucose and HbA<span class="elsevierStyleSup">1c </span>&#40;FPGHbA <span class="elsevierStyleSup">1c</span>&#41; from September 2008 to February 2009 that were performed in the Department of Biochemistry of the Hospital of La L&#237;nea de la Concepci&#243;n&#44; where tests are carried out for the hospital and the six primary care centres &#40;PC&#41;&#46; &#160;</p><p class="elsevierStylePara">&#160;After excluding the 362 results that came from the outpatient nephrology clinic&#44; 4&#44;820 FPG-HbA<span class="elsevierStyleSup">1c </span>results were collected &#40;from patients with a mean age of 64 &#177; 14 years&#41;&#44; 55&#37; were made in women and 74&#37; came from PC&#46; Of these&#44; creatinine was also requested in 3&#44;461 &#40;72&#37;&#41;&#44; the albumin&#47;creatinine ratio was requested in 1&#44;397 &#40;29&#37;&#41;&#44; and a specific request for eGFR was made in only 80 &#40;less than 2&#37;&#41;&#46; Subsequently&#44; we calculated the eGFR in the 1&#44;953 requests in which data were available for age&#44; sex&#44; and creatinine using the classical MDRD formula &#40;coefficient 186&#41;&#44;<span class="elsevierStyleSup">3 </span>since the laboratory uses the modified kinetic Jaff&#233; method &#40;Beckman&#41; without traceability to isotope dilution mass spectrometry &#40;IDMS&#41;&#46;<span class="elsevierStyleSup">4&#44;5 </span>&#160;</p><p class="elsevierStylePara">&#160;Our results in men were of CKD grade 3 in 13&#46;2&#37; and grades 1-2 in 1&#46;6&#37;&#46; In women&#44; 20&#37; with grade 3 and 3&#46;3&#37; with grades 1-2&#46; These data match the most recently reported data on prevalence of kidney disease in patients with diabetes&#46;<span class="elsevierStyleSup">6 </span>By applying CKD-EPI&#44; 1&#46;2&#37; of women and 2&#46;5&#37; of men had worsened grading &#40;Table 1&#41;&#46; If we apply the Bland-Altman graphic method&#44; the results differ from those of Monta&#241;&#233;s et al&#46;&#44;<span class="elsevierStyleSup">1 </span>since there is an average discrepancy of 3&#46;5ml&#47;min &#40;4&#46;4&#37;&#41; favouring MDRD in men and 2&#46;6ml&#47;min &#40;1&#46;7&#37;&#41; favouring CKD-EPI in women &#40;Figure 1&#41;&#46; However&#44; our concordance study &#40;intraclass correlation coefficient and Lin coefficient&#41; is greater than 98&#37;&#46; &#160;</p><p class="elsevierStylePara">&#160;These differences may be explained by the application of the classical formula &#40;coefficient 186&#41; rather than MDRD-IDMS &#40;coefficient 175&#41; and for the unequal population studied&#58; PC versus the nephrology referral centre&#44; 55&#37; women vs&#46; 30&#37; and 81&#37; with grades 4-5 vs&#46; 63&#37;&#46; &#160;</p><p class="elsevierStylePara">&#160;However&#44; on the other hand&#44; the differences are so small that we can say that the new CKD-EPI formulas are tools that are as useful as MDRD and we hope that they will allow us to raise awareness and increase eGFR requests in primary care&#46; &#160;</p><p class="elsevierStylePara"><a href="grande&#47;10259&#95;18030&#95;5941&#95;en&#95;table1&#46;jpg" class="elsevierStyleCrossRefs"><img src="10259_18030_5941_en_table1.gif" alt="CKD grade classification by MDRD"></img></a></p><p class="elsevierStylePara">Table 1&#46; CKD grade classification by MDRD</p><p class="elsevierStylePara"><a href="grande&#47;10259&#95;18030&#95;5942&#95;en&#95;figure1&#46;jpg" class="elsevierStyleCrossRefs"><img src="10259_18030_5942_en_figure1.jpg" alt="Bland Altman method for concordance between MDRD and CKD-EPI"></img></a></p><p class="elsevierStylePara">Figure 1&#46; Bland Altman method for concordance between MDRD and CKD-EPI</p>"
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ISSN: 20132514
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