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In addition to diabetes and older age of patients coming to dialysis as fixed factors&#44; calcium-based binders&#44; vitamin D analogues&#44; and a high calcium dialysate are pointed out as important modifiable factors associated with development of ABD<span class="elsevierStyleSup">5</span>&#46;<br></br><br></br> Indeed&#44; the use of calcium-based binders in combination with vitamin D analogues&#44; has been shown to lead to an oversuppression of parathyroid hormone &#40;PTH&#41; and development of low-bone turnover ABD<span class="elsevierStyleSup">6&#44;7</span>&#46; Thus&#44; a change in paradigm occurred lately whereby not hypocalcemia but hypercalcemia and positive calcium balance were considered negative factors&#46; The changing prevalence of various types of bone diseases from a high to low-bone turnover goes in line with the presence of increased risk for vascular calcification&#44; morbidity and mortality in the dialysis population<span class="elsevierStyleSup">6&#44;7</span>&#46;<br></br><br></br> The attenuation of the previous great expectations in calciumbased phosphate binders and vitamin D-analogues entailed a new treatment strategy to preserve bone and vascular health&#46;<br></br><br></br> Hence&#44; a new treatment approach as prevention of complications of therapy in order to maintain mineral homeostasis and bone health was proposed<span class="elsevierStyleSup">8&#44;9</span>&#46; Furthermore&#44; a new evidence for treatment of ABD with various types of non calcium based binders and low calcium dialysate is presented&#46;<br></br><br></br><span class="elsevierStyleBold">SEVELAMER HYDROCHLORIDE IN TREATMENT OF ABD </span></p><p class="elsevierStylePara">In a post- hoc analysis of thoracic vertebral bone attenuation in patients treated for 1 year in the Treat-to-Goal study&#44; there has been a significant decrease in trabecular bone attenuation in calcium-treated patients&#44; and a trend towards increased bone attenuation in sevelamer-treated patients<span class="elsevierStyleSup">10</span>&#46; The between-group differences in trabecular bone attenuation have been statistically significant <span class="elsevierStyleItalic">&#40;P&#61;</span>0&#46;01&#41;&#46; The lower time averaged PTH in association with higher concentrations of serum calcium achieved in calcium-treated subjects is a likely explanation for the changes observed in bone attenuation&#46;<br></br><br></br> Recently&#44; improved bone histology of ABD patients treated by sevelamer has been reported by Ferreira et al&#46;<span class="elsevierStyleSup">11 </span>Although sevelamer treatment has failed to improve bone turnover or mineralization compared with calcium carbonate&#44; bone formation has been significantly increased and trabecular architecture improved in the sevelamer group&#46; This might be in line with the inert nature of ABD&#44; in which&#44; the bone histology needs a potent and sustained stimulus in order to get an improvement which occurs very slowly&#46; However&#44; changes in biochemical markers of bone turnover may forecast improvements in bone histology&#44; as it was reported in the Japanese dialysis population with low PTH levels treated with sevelamer<span class="elsevierStyleSup">12</span>&#46; The reduced serum calcium concentration and thereby increased PTH levels under sevelamer treatment has resulted in improvement of all markers of bone turnover&#46; Hence&#44; it might have been concluded that the administration of sevelamer might improve the bone remodelling activity even in hemodialysis patients with diabetes &#40;n&#61;14&#41;&#46;<br></br><br></br><span class="elsevierStyleBold">LANTHANUM CARBONATE &#40;LC&#41; BENEFICIAL EFFECT ON ABD HISTOLOGY </span></p><p class="elsevierStylePara">A few study reports on treatment with lanthanum have shown its beneficial effect on bone histology&#46; Namely&#44; there has been a normalization of the bone histomorphometric parameters and almost no evolution toward low bone turnover after 1- year of treatment with lanthanum<span class="elsevierStyleSup">13</span>&#46; An additional follow up in a subset of patients &#40;n&#61;20&#41; showed there is a slow release of lanthanum from its bone deposits 2 years after discontinuation of the treatment&#44; but no association with aluminium-like bone toxicity could have been observed<span class="elsevierStyleSup">14</span>&#46;<br></br><br></br> Finally&#44; a similar phosphate control with calcum vs&#46;lanthanum has resulted in a higher bone turnover after 1 year and a higher bone volume after 2 years with LC&#46; Bone turnover has been low in 58&#37; of patients at baseline in the LC group and in 35&#46;5&#37; of patients after 1-year of treatment&#44; while bone volume has been low at baseline in 28&#37; of patients and in only 9&#46;4&#37; after completion of 2 years of LC therapy<span class="elsevierStyleSup">15</span>&#46; In between group comparison&#44; percentage of patients in the 1-year LC group with improvement in activation frequency and bone formation rate&#47;bone surface has been significantly higher &#40;p &#60; 0&#46;05&#41; than in the calcium group &#40;52&#46;0 and 41&#46;9&#37;&#44; respectively vs&#46; 23&#46;3 and 15&#46;6&#37;&#44; respectively&#41;&#46; Thus&#44; there has been a substantial evidence to conclude lanthanum treatment might have been a preferable option in patients with adynamic bone disease&#46;<br></br><br></br><span class="elsevierStyleBold">LOW CALCIUM DIALYSATE AS AN OPTION TO TREAT ABD </span></p><p class="elsevierStylePara">Assessing the effect of lowering dialysate calcium on episodes of hypercalcemia&#44; serum PTH levels and bone turnover&#44; 51 CAPD patients with bone biopsy-proven ABD were randomized to treatment with control calcium &#40;1&#46;62 mM&#41;&#44; or low calcium &#40;1&#46;0 mM&#41; dialysate fluid over a 16-month period<span class="elsevierStyleSup">16</span>&#46; The low-calcium group has experienced a decrease in serum ionized calcium levels&#44; reduced rate of hypercalcemic episodes&#44; and 300&#37; increase in serum iPTH values&#46; Repeat bone biopsies after 16 months have shown that the low-calcium bath has led to a normalization of BFR and an improved ABD histology in 40&#37; of patients at the end of the study&#46; Yet&#44; there has been a lack of biopsy proven evidence of low calcium dialysate treatment in ABD patients&#46;<br></br><br></br> Nevertheless&#44; an indirect effect as evolution towards parameters reflecting higher bone turnover in patients treated for 6 months with dialysate calcium of 1&#46;25 mmol&#47;l has been recently reported<span class="elsevierStyleSup">17</span>&#46; It occurs most likely by prevention of a positive calcium balance and enabling sustained stimulation of PTH secretion&#44; but it should be confirmed in a bone biopsy based studies&#46;<br></br><br></br><span class="elsevierStyleBold">CONCLUSIONS </span></p><p class="elsevierStylePara">Reducing the number of calcium-based binders to only 1g per main meal&#47;daily and a low calcium dialysate &#40;1&#46;25 mmol&#47;l&#41; 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        "resumen" => "<p class="elsevierStylePara">Recientemente se ha cambiado de parecer en cuanto al paradigma por el que la hipercalcemia&#44; en lugar de la hipocalcemia&#44; y el equilibrio positivo de calcio se consideraban factores negativos&#46; En otras palabras&#44; se ha demostrado que el uso de quelantes c&#225;lcicos junto con an&#225;logos de vitamina D conlleva una sobresupresi&#243;n de la hormona paratiroidea &#40;PTH&#41; y la aparici&#243;n de enfermedad &#243;sea adin&#225;mica &#40;EOA&#41; o de bajo remodelado &#40;EOBR&#41;&#46; La prevalencia variable de los diferentes tipos de enfermedades &#243;seas desde las de alto remodelado hasta las de bajo remodelado est&#225; alineada con la presencia de un mayor riesgo de calcificaci&#243;n vascular &#40;CV&#41;&#44; morbilidad y mortalidad en la poblaci&#243;n sometida a di&#225;lisis&#46; La atenuaci&#243;n de las grandes expectativas anteriores en los quelantes c&#225;lcicos del f&#243;sforo y los an&#225;logos de vitamina D conlleva una nueva estrategia de tratamiento para mantener la salud &#243;sea y vascular&#46; De esta forma&#44; se presenta una nueva justificaci&#243;n para el tratamiento de la EOA con diferentes tipos de quelantes que no contengan calcio y con hemodi&#225;lisis con calcio bajo&#46; El tratamiento con Sevelamer ha reducido la concentraci&#243;n de calcio y aumentado los niveles de PTH&#44; obteniendo como resultado la mejora de los marcadores de remodelado &#243;seo&#44; el aumento de la formaci&#243;n &#243;sea y una mejora de la arquitectura trabecular&#44; de forma que la progresi&#243;n de CV se ralentiza a&#250;n m&#225;s&#46; Los datos sobre los beneficios del lantano en la histolog&#237;a de la EOA se han extra&#237;do de estudios cl&#237;nicos a largo plazo&#46; Aunque tras la interrupci&#243;n del tratamiento&#44; se produce una liberaci&#243;n lenta de lantano de los dep&#243;sitos &#243;seos y no existe relaci&#243;n con la toxicidad a nivel &#243;seo similar a la del aluminio&#44; el debate cient&#237;fico sobre su potencial t&#243;xico a largo plazo sigue abierto&#46; Finalmente&#44; se ha demostrado que reducir el n&#250;mero de quelantes c&#225;lcicos y el nivel de calcio en la hemodi&#225;lisis &#40;1&#44;25 mmol&#47;l&#41; tiene repercusiones en la evoluci&#243;n hacia los marcadores que reflejan un remodelado &#243;seo mayor&#46; Por tanto&#44; la adopci&#243;n de quelantes que no contienen calcio deber&#237;a reservarse a los pacientes con EOA de alto riesgo y progresi&#243;n de calcificaciones vasculares asociadas con una mayor morbi-mortalidad&#46;</p>"
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        "resumen" => "<p class="elsevierStylePara"><span class="elsevierStyleItalic">A change in paradigm occurred lately whereby not hypocalcemia but hypercalcemia and positive calcium balance were considered negative factors&#46; Namely&#44; the use of calcium- based binders in combination with vitamin D analogues&#44; has been shown to lead to an over-suppression of parathyroid hormone &#40;PTH&#41; and development of low-bone turnover adynamic bone disease &#40;ABD&#41;&#46; The changing prevalence of various types of bone diseases from a high to low-bone turnover goes in line with the presence of increased risk for vascular calcification &#40;VC&#41;&#44; morbidity and mortality in the dialysis population&#46; The attenuation of the previous great expectations in calcium-based phosphate binders and vitamin D-analogues entailed a new treatment strategy to preserve bone and vascular health&#46; Hence&#44; a new evidence for treatment of ABD with various types of non calcium based binders and low calcium dialysate is presented&#46; Sevelamer treatment has reduced calcium concentration and increased PTH levels&#44; resulting in the improvement of markers of bone turnover&#44; increased bone formation and improved trabecular architecture&#44; providing a slower progression of VC&#46; Data on lanthanum beneficial effect on ABD histology have been demonstrated in long-term clinical studies&#46; Although there is a slow release of lanthanum from its bone deposits after discontinuation of the treatment and no association with aluminium- like bone toxicity&#44; there is still an ongoing scientific debate about its long-term toxic potential&#46; Finally&#44; reducing the number of calcium based binders and low calcium dialysate &#40;1&#46;25 mmol&#47;l&#41; has been reported to have an impact on the evolution towards markers reflecting higher bone turnover&#46; Then&#44; adoption of the non calcium-based binders should be reserved to high risk patients with ABD and progression of vascular calcifications associated with increased morbidity and mortality&#46;<br /> <br /> </span></p>"
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                  "referenciaCompleta" => "Spasovski G. Bone health and vascular calcification relationships in chronic kidney disease. Int Urol Nephrol 2007;39(4):1209-16. <a href="http://www.ncbi.nlm.nih.gov/pubmed/17899431" target="_blank">[Pubmed]</a>"
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Strategies to manage low-bone turnover
G.. Spasovskia
a Department of Nephrology, University of Skopje, Vodnjanska, Macedonia,
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    "titulo" => "Strategies to manage low-bone turnover"
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    "textoCompleto" => "<p class="elsevierStylePara"><span class="elsevierStyleBold">INTRODUCTION </span></p><p class="elsevierStylePara">Many nephrologists are reluctant to perform bone biopsy&#44; although it has been considered as golden standard and diagnostic tool in identifying the type of bone diseases in chronic kidney disease &#40;CKD&#41; &#8211; mineral and bone disordered patients<span class="elsevierStyleSup">1</span>&#46; Four types of renal osteodystrophy can be distinguished&#58; low turnover osteomalacia &#40;OM&#41; and adynamic bone disease &#40;ABD&#41;&#44; hyperparathyroid bone disease &#40;HPTH&#41; and mixed lesion &#40;Mx&#41;&#44; even before dialysis treatment is started<span class="elsevierStyleSup">2</span>&#46; Over the last two decades the prevalence of ABD has been increased in dialysis and peritoneal dialysis patients&#44; as well as in CKD populations&#44; and nowadays represents the most frequent type of bone lesion<span class="elsevierStyleSup">3&#44;4</span>&#46; In addition to diabetes and older age of patients coming to dialysis as fixed factors&#44; calcium-based binders&#44; vitamin D analogues&#44; and a high calcium dialysate are pointed out as important modifiable factors associated with development of ABD<span class="elsevierStyleSup">5</span>&#46;<br></br><br></br> Indeed&#44; the use of calcium-based binders in combination with vitamin D analogues&#44; has been shown to lead to an oversuppression of parathyroid hormone &#40;PTH&#41; and development of low-bone turnover ABD<span class="elsevierStyleSup">6&#44;7</span>&#46; Thus&#44; a change in paradigm occurred lately whereby not hypocalcemia but hypercalcemia and positive calcium balance were considered negative factors&#46; The changing prevalence of various types of bone diseases from a high to low-bone turnover goes in line with the presence of increased risk for vascular calcification&#44; morbidity and mortality in the dialysis population<span class="elsevierStyleSup">6&#44;7</span>&#46;<br></br><br></br> The attenuation of the previous great expectations in calciumbased phosphate binders and vitamin D-analogues entailed a new treatment strategy to preserve bone and vascular health&#46;<br></br><br></br> Hence&#44; a new treatment approach as prevention of complications of therapy in order to maintain mineral homeostasis and bone health was proposed<span class="elsevierStyleSup">8&#44;9</span>&#46; Furthermore&#44; a new evidence for treatment of ABD with various types of non calcium based binders and low calcium dialysate is presented&#46;<br></br><br></br><span class="elsevierStyleBold">SEVELAMER HYDROCHLORIDE IN TREATMENT OF ABD </span></p><p class="elsevierStylePara">In a post- hoc analysis of thoracic vertebral bone attenuation in patients treated for 1 year in the Treat-to-Goal study&#44; there has been a significant decrease in trabecular bone attenuation in calcium-treated patients&#44; and a trend towards increased bone attenuation in sevelamer-treated patients<span class="elsevierStyleSup">10</span>&#46; The between-group differences in trabecular bone attenuation have been statistically significant <span class="elsevierStyleItalic">&#40;P&#61;</span>0&#46;01&#41;&#46; The lower time averaged PTH in association with higher concentrations of serum calcium achieved in calcium-treated subjects is a likely explanation for the changes observed in bone attenuation&#46;<br></br><br></br> Recently&#44; improved bone histology of ABD patients treated by sevelamer has been reported by Ferreira et al&#46;<span class="elsevierStyleSup">11 </span>Although sevelamer treatment has failed to improve bone turnover or mineralization compared with calcium carbonate&#44; bone formation has been significantly increased and trabecular architecture improved in the sevelamer group&#46; This might be in line with the inert nature of ABD&#44; in which&#44; the bone histology needs a potent and sustained stimulus in order to get an improvement which occurs very slowly&#46; However&#44; changes in biochemical markers of bone turnover may forecast improvements in bone histology&#44; as it was reported in the Japanese dialysis population with low PTH levels treated with sevelamer<span class="elsevierStyleSup">12</span>&#46; The reduced serum calcium concentration and thereby increased PTH levels under sevelamer treatment has resulted in improvement of all markers of bone turnover&#46; Hence&#44; it might have been concluded that the administration of sevelamer might improve the bone remodelling activity even in hemodialysis patients with diabetes &#40;n&#61;14&#41;&#46;<br></br><br></br><span class="elsevierStyleBold">LANTHANUM CARBONATE &#40;LC&#41; BENEFICIAL EFFECT ON ABD HISTOLOGY </span></p><p class="elsevierStylePara">A few study reports on treatment with lanthanum have shown its beneficial effect on bone histology&#46; Namely&#44; there has been a normalization of the bone histomorphometric parameters and almost no evolution toward low bone turnover after 1- year of treatment with lanthanum<span class="elsevierStyleSup">13</span>&#46; An additional follow up in a subset of patients &#40;n&#61;20&#41; showed there is a slow release of lanthanum from its bone deposits 2 years after discontinuation of the treatment&#44; but no association with aluminium-like bone toxicity could have been observed<span class="elsevierStyleSup">14</span>&#46;<br></br><br></br> Finally&#44; a similar phosphate control with calcum vs&#46;lanthanum has resulted in a higher bone turnover after 1 year and a higher bone volume after 2 years with LC&#46; Bone turnover has been low in 58&#37; of patients at baseline in the LC group and in 35&#46;5&#37; of patients after 1-year of treatment&#44; while bone volume has been low at baseline in 28&#37; of patients and in only 9&#46;4&#37; after completion of 2 years of LC therapy<span class="elsevierStyleSup">15</span>&#46; In between group comparison&#44; percentage of patients in the 1-year LC group with improvement in activation frequency and bone formation rate&#47;bone surface has been significantly higher &#40;p &#60; 0&#46;05&#41; than in the calcium group &#40;52&#46;0 and 41&#46;9&#37;&#44; respectively vs&#46; 23&#46;3 and 15&#46;6&#37;&#44; respectively&#41;&#46; Thus&#44; there has been a substantial evidence to conclude lanthanum treatment might have been a preferable option in patients with adynamic bone disease&#46;<br></br><br></br><span class="elsevierStyleBold">LOW CALCIUM DIALYSATE AS AN OPTION TO TREAT ABD </span></p><p class="elsevierStylePara">Assessing the effect of lowering dialysate calcium on episodes of hypercalcemia&#44; serum PTH levels and bone turnover&#44; 51 CAPD patients with bone biopsy-proven ABD were randomized to treatment with control calcium &#40;1&#46;62 mM&#41;&#44; or low calcium &#40;1&#46;0 mM&#41; dialysate fluid over a 16-month period<span class="elsevierStyleSup">16</span>&#46; The low-calcium group has experienced a decrease in serum ionized calcium levels&#44; reduced rate of hypercalcemic episodes&#44; and 300&#37; increase in serum iPTH values&#46; Repeat bone biopsies after 16 months have shown that the low-calcium bath has led to a normalization of BFR and an improved ABD histology in 40&#37; of patients at the end of the study&#46; Yet&#44; there has been a lack of biopsy proven evidence of low calcium dialysate treatment in ABD patients&#46;<br></br><br></br> Nevertheless&#44; an indirect effect as evolution towards parameters reflecting higher bone turnover in patients treated for 6 months with dialysate calcium of 1&#46;25 mmol&#47;l has been recently reported<span class="elsevierStyleSup">17</span>&#46; It occurs most likely by prevention of a positive calcium balance and enabling sustained stimulation of PTH secretion&#44; but it should be confirmed in a bone biopsy based studies&#46;<br></br><br></br><span class="elsevierStyleBold">CONCLUSIONS </span></p><p class="elsevierStylePara">Reducing the number of calcium-based binders to only 1g per main meal&#47;daily and a low calcium dialysate &#40;1&#46;25 mmol&#47;l&#41; should be an immediate preventive treatment in order to attenuate the indirect harmful effect of ABD on vascular calcification progression in dialysis patients&#46; There is scarce evidence that this baseline therapeutical approach could even improve ABD histology&#46; While waiting further biopsy based evidence in this regard&#44; adoption of the non calcium-based binders should be reserved for ABD patients with a high risk of fractures and progression of vascular calcifications associated with increased morbidity and mortality&#46;<br></br><br></br></p>"
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        "resumen" => "<p class="elsevierStylePara">Recientemente se ha cambiado de parecer en cuanto al paradigma por el que la hipercalcemia&#44; en lugar de la hipocalcemia&#44; y el equilibrio positivo de calcio se consideraban factores negativos&#46; En otras palabras&#44; se ha demostrado que el uso de quelantes c&#225;lcicos junto con an&#225;logos de vitamina D conlleva una sobresupresi&#243;n de la hormona paratiroidea &#40;PTH&#41; y la aparici&#243;n de enfermedad &#243;sea adin&#225;mica &#40;EOA&#41; o de bajo remodelado &#40;EOBR&#41;&#46; La prevalencia variable de los diferentes tipos de enfermedades &#243;seas desde las de alto remodelado hasta las de bajo remodelado est&#225; alineada con la presencia de un mayor riesgo de calcificaci&#243;n vascular &#40;CV&#41;&#44; morbilidad y mortalidad en la poblaci&#243;n sometida a di&#225;lisis&#46; La atenuaci&#243;n de las grandes expectativas anteriores en los quelantes c&#225;lcicos del f&#243;sforo y los an&#225;logos de vitamina D conlleva una nueva estrategia de tratamiento para mantener la salud &#243;sea y vascular&#46; De esta forma&#44; se presenta una nueva justificaci&#243;n para el tratamiento de la EOA con diferentes tipos de quelantes que no contengan calcio y con hemodi&#225;lisis con calcio bajo&#46; El tratamiento con Sevelamer ha reducido la concentraci&#243;n de calcio y aumentado los niveles de PTH&#44; obteniendo como resultado la mejora de los marcadores de remodelado &#243;seo&#44; el aumento de la formaci&#243;n &#243;sea y una mejora de la arquitectura trabecular&#44; de forma que la progresi&#243;n de CV se ralentiza a&#250;n m&#225;s&#46; Los datos sobre los beneficios del lantano en la histolog&#237;a de la EOA se han extra&#237;do de estudios cl&#237;nicos a largo plazo&#46; Aunque tras la interrupci&#243;n del tratamiento&#44; se produce una liberaci&#243;n lenta de lantano de los dep&#243;sitos &#243;seos y no existe relaci&#243;n con la toxicidad a nivel &#243;seo similar a la del aluminio&#44; el debate cient&#237;fico sobre su potencial t&#243;xico a largo plazo sigue abierto&#46; Finalmente&#44; se ha demostrado que reducir el n&#250;mero de quelantes c&#225;lcicos y el nivel de calcio en la hemodi&#225;lisis &#40;1&#44;25 mmol&#47;l&#41; tiene repercusiones en la evoluci&#243;n hacia los marcadores que reflejan un remodelado &#243;seo mayor&#46; Por tanto&#44; la adopci&#243;n de quelantes que no contienen calcio deber&#237;a reservarse a los pacientes con EOA de alto riesgo y progresi&#243;n de calcificaciones vasculares asociadas con una mayor morbi-mortalidad&#46;</p>"
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        "resumen" => "<p class="elsevierStylePara"><span class="elsevierStyleItalic">A change in paradigm occurred lately whereby not hypocalcemia but hypercalcemia and positive calcium balance were considered negative factors&#46; Namely&#44; the use of calcium- based binders in combination with vitamin D analogues&#44; has been shown to lead to an over-suppression of parathyroid hormone &#40;PTH&#41; and development of low-bone turnover adynamic bone disease &#40;ABD&#41;&#46; The changing prevalence of various types of bone diseases from a high to low-bone turnover goes in line with the presence of increased risk for vascular calcification &#40;VC&#41;&#44; morbidity and mortality in the dialysis population&#46; The attenuation of the previous great expectations in calcium-based phosphate binders and vitamin D-analogues entailed a new treatment strategy to preserve bone and vascular health&#46; Hence&#44; a new evidence for treatment of ABD with various types of non calcium based binders and low calcium dialysate is presented&#46; Sevelamer treatment has reduced calcium concentration and increased PTH levels&#44; resulting in the improvement of markers of bone turnover&#44; increased bone formation and improved trabecular architecture&#44; providing a slower progression of VC&#46; Data on lanthanum beneficial effect on ABD histology have been demonstrated in long-term clinical studies&#46; Although there is a slow release of lanthanum from its bone deposits after discontinuation of the treatment and no association with aluminium- like bone toxicity&#44; there is still an ongoing scientific debate about its long-term toxic potential&#46; Finally&#44; reducing the number of calcium based binders and low calcium dialysate &#40;1&#46;25 mmol&#47;l&#41; has been reported to have an impact on the evolution towards markers reflecting higher bone turnover&#46; Then&#44; adoption of the non calcium-based binders should be reserved to high risk patients with ABD and progression of vascular calcifications associated with increased morbidity and mortality&#46;<br /> <br /> </span></p>"
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Original language: English
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