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"apellidos" => "Saavedra-Alonso" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "affa" ] ] ] 3 => array:3 [ "nombre" => "Argimiro" "apellidos" => "Gándara-Martínez" "referencia" => array:1 [ 0 => array:2 [ "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "affa" ] ] ] ] "afiliaciones" => array:1 [ 0 => array:3 [ "entidad" => "Servicio de Nefrología, Hospital Universitario de Vigo, Vigo, Pontevedra, " "etiqueta" => "<span class="elsevierStyleSup">a</span>" "identificador" => "affa" ] ] ] ] "titulosAlternativos" => array:1 [ "es" => array:1 [ "titulo" => "Costes de los conciertos de hemodiálisis y diálisis peritoneal" ] ] "textoCompleto" => "<p class="elsevierStylePara"><span class="elsevierStyleBold">To the Editor,</span></p><p class="elsevierStylePara">In response to the letters by Drs Arrieta et al and Minguela et al regarding our article,<span class="elsevierStyleSup">1</span> we wish to thank them for their interest, criticism and input, and add the following clarifications.</p><p class="elsevierStylePara">Let us assume that haemodialysis (HD) and peritoneal dialysis (PD) are similarly effective, based on data found in the literature and corroborated by a review recently published in our journal.<span class="elsevierStyleSup">2</span> The fact that some studies of patients on PD show higher survival rates, lower hospitalisation rates and a higher apparent probability of undergoing transplantation may be due, as other authors have indicated, to biases related to the characteristics and co-morbidities of patients included in each of the treatment regimens.</p><p class="elsevierStylePara">Our study clearly shows that the cost of PD is highly dependent on the prescription, and costs are no always lower than in HD. One treatment or the other are considered more efficient depending on the costs of other treatment components (transport for HD, accesses for dialysis and their complications, drugs, emergency care, hospitalisations) which vary between different hospitals. This is why it is important to consider prescriptions in PD and rigorously estimate costs in future studies, which should be publicly financed and include participation by a representative number of medical centres in order to eliminate biases inherent to the "centre effect".</p><p class="elsevierStylePara">We agree that all costs to nephrology departments incurred by patients being treated in an outsourced centre must be calculated, but we must distinguish between care for issues that are common to both techniques and complications that are directly related to one treatment regimen or the other.</p><p class="elsevierStylePara">We do not have the data regarding the percentage of patients undergoing more than 3 weekly HD sessions in an outsourced centre. The cited S.E.N. data are based on a record of daily HD sessions,<span class="elsevierStyleSup">3</span> which only included 70% of prevalent patients on HD.<span class="elsevierStyleSup">4</span> Of them, 3.5% underwent 3.5 or 4 weekly sessions and only 1.5% underwent 5 or more sessions. If we extrapolate these data to our study, the results do not change significantly. High-flux membranes and special techniques do not affect HD outsourcing costs in our region because mark-ups associated with them do not enter into the equation; these materials are used according to the provider’s best judgement and at the provider's expense.</p><p class="elsevierStylePara">We do agree that we should have included value-added tax (VAT) when we calculated the difference between the outsourced service costs and the consumable materials. But if we consider this as a reimbursement passed on to the Treasury, we should also count VAT paid for outsourced HD services for the purchase of monitors, materials and other services, and the personal income tax on participants in both outsourced services. With regard to personnel hired by companies providing PD, it is similar to staff providing dialysis material in outsourced HD centres and it is already included in the cost of the service.</p><p class="elsevierStylePara">In conclusion, we also believe that PD is underused, but we would not say that economic concerns are the best reason for promoting this treatment regimen due to discrepancies listed in our article. Rather, we feel that equal access to all types of dialysis in all nephrology departments should be guaranteed, and that the process of selecting the technique should revolve around the patient's situation, the patient being free to choose an option after being properly informed.</p><p class="elsevierStylePara">We trust that further multi-centre studies that receive public funding and evaluate all of the factors in play will aid in clarifying the questions that have been raised.</p><p class="elsevierStylePara"> </p><p class="elsevierStylePara"><span class="elsevierStyleBold">Conflicts of interest</span></p><p class="elsevierStylePara"> </p><p class="elsevierStylePara">The authors declare potential conflicts of interest:</p><p class="elsevierStylePara">- <span class="elsevierStyleBold">Grants</span>: the authors receive funds for different research projects from <span class="elsevierStyleItalic">Instituto Reina Sofía de Investigación </span>research centre, which belongs to the <span class="elsevierStyleItalic">Fundación Renal Íñigo Álvarez de Toledo </span>(Íñigo Álvarez de Toledo Kidney Foundation).</p><p class="elsevierStylePara">- <span class="elsevierStyleBold">Travel</span><span class="elsevierStyleBold">expenses</span>: the authors receive funding for different continuous training activities from the firms Baxter, Fresenius, Hospal and Gambro.</p>" "pdfFichero" => "P1-E534-S3461-A11342-EN.pdf" "tienePdf" => true "bibliografia" => array:2 [ "titulo" => "Bibliography" "seccion" => array:1 [ 0 => array:1 [ "bibliografiaReferencia" => array:4 [ 0 => array:3 [ "identificador" => "bib1" "etiqueta" => "1" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Lamas J, Alonso M, Saavedra J, Gándara A. Costes y valor añadido de los conciertos de hemodiálisis y diálisis peritoneal. Nefrologia 2011;31(6):656-63. <a href="http://www.ncbi.nlm.nih.gov/pubmed/22130280" target="_blank">[Pubmed]</a>" "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] 1 => array:3 [ "identificador" => "bib2" "etiqueta" => "2" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Remón-Rodríguez C, Quirós Ganga PL. La evidencia actual demuestra una equivalencia de resultados entre las técnicas de diálisis. Nefrologia 2011;31(5): 520-7. <a href="http://www.ncbi.nlm.nih.gov/pubmed/21959718" target="_blank">[Pubmed]</a>" "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] 2 => array:3 [ "identificador" => "bib3" "etiqueta" => "3" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Registro español de hemodiálisis diaria. Informe del año 2009. Available at: http://www.senefro.org/modules.php?name=webstructure&idwebstructure=634" "contribucion" => array:1 [ 0 => null ] "host" => array:1 [ 0 => null ] ] ] ] 3 => array:3 [ "identificador" => "bib4" "etiqueta" => "4" "referencia" => array:1 [ 0 => array:3 [ "referenciaCompleta" => "Registro español de diálisis y trasplante. Informe del año 2009. 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