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Carta al Director
Concentración de hemoglobina reticulocitaria y ferroterapia en la ERC
Reticulocyte hemoglobin content and iron therapy in CKD
Javier Deiraa,
Autor para correspondencia
javierlorenzo.deira@salud-juntaex.es

Autor para correspondencia.
, Cristina García de la Vegaa, Elena Davína, María José Arcosb
a Servicio de Nefrología, Hospital San Pedro de Alcántara, Cáceres, España
b Servicio de Hematología, Hospital San Pedro de Alcántara, Cáceres, España
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Hemos le&#237;do con mucho inter&#233;s la revisi&#243;n &#8220;<span class="elsevierStyleItalic">Ferroterapia en el manejo de la anemia en la enfermedad renal cr&#243;nica no di&#225;lisis&#58; perspectiva del grupo de anemia de la S&#46;E&#46;N</span><a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a>&#46; En ella&#44; los autores nos ponen al d&#237;a sobre el manejo del d&#233;ficit de hierro en pacientes con enfermedad renal cr&#243;nica &#40;ERC&#41;&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">Queda bien reflejado que el diagn&#243;stico y tratamiento del d&#233;ficit absoluto de hierro es sencillo&#44; y que existe un amplio consenso al respecto<a class="elsevierStyleCrossRefs" href="#bib0055"><span class="elsevierStyleSup">1&#8211;3</span></a>&#46; Con el d&#233;ficit funcional de hierro no ocurre lo mismo&#46; En esta situaci&#243;n cl&#237;nica&#44; producida en la mayor&#237;a de las ocasiones por inflamaci&#243;n&#44; existe un aumento de la s&#237;ntesis de la hepcidina &#40;debido a la IL-6&#41; a nivel hep&#225;tico<a class="elsevierStyleCrossRef" href="#bib0070"><span class="elsevierStyleSup">4</span></a>&#46; La hepcidina bloquea la ferroportina&#44; &#250;nico canal celular existente para la exportaci&#243;n del hierro celular al torrente circulatorio&#44; lo que disminuye la adecuada disponibilidad del mismo en la m&#233;dula &#243;sea&#46; Esto conduce a una deficiente s&#237;ntesis de hemoglobina en los reticulocitos<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a>&#46; A diferencia de la hemoglobina corpuscular media cuyo valor disminuye despu&#233;s de varias semanas&#44; el d&#233;ficit medular de hierro puede estimarse en unos pocos d&#237;as&#44; a partir del contenido de hemoglobina del reticulocito &#40;CHr&#41;<a class="elsevierStyleCrossRef" href="#bib0075"><span class="elsevierStyleSup">5</span></a>&#46; Por ello&#44; todas las gu&#237;as recomiendan el porcentaje hemat&#237;es hipocromos o la CHr como los mejores par&#225;metros de laboratorio para el diagn&#243;stico del d&#233;ficit funcional de hierro &#40;1B&#41;<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#8211;8</span></a>&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">Incomprensiblemente&#44; los autores<a class="elsevierStyleCrossRef" href="#bib0055"><span class="elsevierStyleSup">1</span></a> nos dicen que debemos seguir utilizando los marcadores cl&#225;sicos &#40;ferritina s&#233;rica y saturaci&#243;n de transferrina-SAT-&#41; aludiendo a que los <span class="elsevierStyleItalic">nuevos marcadores son menos accesibles&#44; m&#225;s caros y poco fiables</span>&#46; No podemos trasmitir este concepto&#44; puesto que con la introducci&#243;n generalizada de los contadores automatizados de c&#233;lulas&#44; la mayor&#237;a de laboratorios actualmente pueden medir el n&#250;mero&#44; volumen y tambi&#233;n la CHr&#44; y detectar as&#237; precozmente un d&#233;ficit de hierro<a class="elsevierStyleCrossRef" href="#bib0080"><span class="elsevierStyleSup">6</span></a>&#46; Adem&#225;s&#44; las marcadores eritrocitarios no solo no son caros&#44; sino que son la opci&#243;n m&#225;s rentable cuando se comparan las distintas pruebas que valoran el DFI y su respuesta al tratamiento&#44; tanto en pacientes con ERC en hemodi&#225;lisis como en pacientes no sometidos a hemodi&#225;lisis<a class="elsevierStyleCrossRef" href="#bib0090"><span class="elsevierStyleSup">8</span></a>&#46; Por &#250;ltimo&#44; estos marcadores son muy fiables&#46; Mast et al&#46;<a class="elsevierStyleCrossRef" href="#bib0095"><span class="elsevierStyleSup">9</span></a> comprobaron&#44; en pacientes sometidos a examen de m&#233;dula &#243;sea por otros motivos&#44; que tienen un valor predictivo para el d&#233;ficit de hierro superior a los par&#225;metros cl&#225;sicos &#40;ferritina s&#233;rica o TSAT&#41;&#46; Nosotros tambi&#233;n hemos comprobado la excelente correlaci&#243;n que existe entre la CHr y los marcadores cl&#225;sicos<a class="elsevierStyleCrossRef" href="#bib0100"><span class="elsevierStyleSup">10</span></a>&#44; por ello creemos que hoy por hoy son accesibles&#44; rentables y muy fiables&#44; y se debe aconsejar su uso&#44; tal y como recomiendan las gu&#237;as<a class="elsevierStyleCrossRefs" href="#bib0080"><span class="elsevierStyleSup">6&#8211;8</span></a>&#46;</p></span>"
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