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    "textoCompleto" => "<p class="elsevierStylePara"><span class="elsevierStyleBold">To the Editor&#44;</span></p><p class="elsevierStylePara"><span class="elsevierStyleItalic">Nefrolog&#237;a </span>has recently published a case of post-denosumab hypocalcaemia and we would like to contribute to this subject<span class="elsevierStyleSup">1</span>&#46; Denosumab is an anti-RANKL &#40;receptor activator of nuclear factor<span class="elsevierStyleItalic">-&#954;</span> B ligand&#41; monoclonal antibody used in osteoporosis treatment as an antiresorptive agent&#46; Unlike bisphosphonates&#44; denosumab does not appear to be nephrotoxic<span class="elsevierStyleSup">2</span>&#44; nor does it require dosage adjustments in kidney failure due to its favourable pharmacokinetic and pharmacodynamic profile<span class="elsevierStyleSup">1&#44;3</span>&#46; However&#44; the qualitative bone changes in osteoporosis patients are not comparable with the wide spectrum of alterations in bone turnover that accompanies chronic kidney disease &#40;CKD&#41;<span class="elsevierStyleSup">4</span>&#46; For this reason and in relation to the changes in mineral metabolism caused by denosumab&#44; its safety in this population could be questioned&#46; We describe a patient with advanced CKD with extreme hypocalcaemia and hyperparathyroidism following continuous administration of denosumab&#46;</p><p class="elsevierStylePara">The patient is a 75-year-old female who sought treatment for tremors&#44; muscle spasms and paraesthesia in the limbs&#46; Stage 5 CKD&#44; probably secondary to nephroangiosclerosis and diabetes mellitus&#44; stands out in her medical history&#46; She is allergic to penicillin and is treated with insulin&#44; doxazosin&#44; nifedipine GITS&#44; torsemide&#44; acetylsalicyclic acid&#44; oral iron&#44; erythropoietin&#44; paricalcitol and calcifediol&#46; She was treated&#44; until 7 months before&#44; with 70mg alendronic acid&#44; which was suspended on starting six-monthly subcutaneous 60mg denosumab&#46; Her nephrologist was unaware of the prescription of this drug&#46; She presented the following analysis&#58; creatinine 3&#46;6mg&#47;dl&#44; total corrected calcium 10&#46;06mg&#47;dl&#44; ionic calcium 5&#46;1mg&#47;dl&#44; phosphate 5&#46;1mg&#47;dl&#44; alkaline phosphatase 157U&#47;l&#44; bicarbonate 27&#46;6mmol&#47;l&#44; parathyroid hormone &#40;PTH&#41; 436pg&#47;ml&#44; 25-vitamin D 30&#46;2ng&#47;ml&#46; The evolution of the biochemical parameters until the last analysis 14 days after denosumab is shown in Figure 1&#46; The patient did not attend this last evaluation due to not feeling well&#46; Six days later&#44; she was examined in the Emergency Department&#58; urea 154mg&#47;dl&#44; creatinine 6mg&#47;dl&#44; total corrected calcium 4&#46;36mg&#47;dl&#44; ionic calcium 2&#46;4mg&#47;dl&#44; phosphate 6&#46;7mg&#47;dl&#44; magnesium 1&#46;3mg&#47;dl&#44; alkaline phosphatase 59U&#47;l&#44; bicarbonate 18&#46;6mmol&#47;l&#44; PTH 1900pg&#47;ml&#46; Electrocardiogram &#40;ECG&#41;&#58; 440ms corrected QT &#40;QTc&#41;&#46; Oral and intravenous calcium replacement and intravenous calcitriol were started&#44; with the disappearance of symptoms&#46; After 15 days of parenteral replacement&#44; the analytical parameters had normalised &#40;Figure 1&#41;&#58; ECG&#58; QTc 402ms&#46; PTH remained 1858pg&#47;ml&#46;</p><p class="elsevierStylePara">The recommendations for the use of denosumab in kidney failure are based on a clinical trial involving very few patients&#44; over a 16 week follow-up period and following only one dose of the drug<span class="elsevierStyleSup">3</span>&#46; In addition&#44; the authors excluded&#44; in part of the study&#44; those subjects with 1&#46;25-dihydroxyvitamin D levels &#60;30pg&#47;ml&#44; severe renal failure and PTH &#8805;110pg&#47;ml or kidney failure and PTH &#8805;300pg&#47;ml&#46; Even so&#44; 22&#37;-25&#37; of the cases with moderate-severe renal failure or patients on dialysis presented hypocalcaemia&#46; The authors recommend calcium and vitamin D supplements for its prevention&#46; In another clinical trial carried out over 36 months in post-menopausal women with CKD and estimated glomerular filtration rate &#62;15ml&#47;min&#44; cases of hypoparathyroidism&#44; hyperparathyroidism&#44; hypercalcaemia and hypovitaminosis D were excluded&#59; PTH levels were not monitored in the study<span class="elsevierStyleSup">2</span>&#46;</p><p class="elsevierStylePara">In recent months&#44; cases of hypocalcaemia in chronic nephropathies have continued to be reported<span class="elsevierStyleSup">1&#44;5-8</span>&#46; Non previous biphosphonate use and kidney failure are risk factors for developing hypocalcaemia<span class="elsevierStyleSup">8</span>&#46; Consequently&#44; our patient may only have developed hypocalcaemia following the second dose&#44; since she had previously been treated with alendronate&#46;</p><p class="elsevierStylePara">Denosumab reduces the number of osteoclasts and bone formation rate&#46; Hypocalcaemia would be related to the rapid mineral deposit of calcium in the new bone matrix&#44; which would behave similarly to a hungry bone following parathyroidectomy<span class="elsevierStyleSup">3</span>&#46; However&#44; as occurred in this case&#44; PTH was not suppressed&#44; but hyperstimulated&#46; In addition to sudden hypocalcaemia following the second denosumab dose&#44; PTH levels were progressively increasing to very high levels following the first dose&#44; despite vitamin D supplements&#59; we also observed a reduction of alkaline phosphatase&#46; For some experts&#44; this inhibition of osteoclastogenesis could favour adynamic bone disease in CKD<span class="elsevierStyleSup">4&#44;5</span>&#46;</p><p class="elsevierStylePara">The monitoring of calcium levels 8-14 days after treatment has been advised<span class="elsevierStyleSup">7</span>&#46; However&#44; this does not guarantee its prevention&#44; since it is not known when the nadir is reached<span class="elsevierStyleSup">7</span>&#46;</p><p class="elsevierStylePara">Denosumab can cause potentially fatal short-term adverse effects&#44; as well as other unknown long-term effects&#44; on the bone of CKD patients&#46; For these reasons&#44; some authors recommend not using denosumab in CKD patients or only using it if a bone biopsy has previously been carried out<span class="elsevierStyleSup">4&#44;6</span>&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Conflicts of interest</span></p><p class="elsevierStylePara">The authors declare that they have no conflicts of interest related to the contents of this article&#46;</p><p class="elsevierStylePara"><a href="grande&#47;12383&#95;16025&#95;60197&#95;en&#95;f112383&#46;jpg" class="elsevierStyleCrossRefs"><img src="12383_16025_60197_en_f112383.jpg" alt="Evolution of biochemical parameters"></img></a></p><p class="elsevierStylePara">Figure 1&#46; Evolution of biochemical parameters</p>"
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Extreme hypocalcaemia and hyperparathyroidism following denosumab. Is this drug safe in chronic kidney disease?
Hipocalcemia e hiperparatiroidismo extremos tras denosumab. ¿Es seguro este fármaco en la enfermedad renal crónica?
Ana E. Sirventa, Ricardo Enríqueza, María Sáncheza, César Gonzáleza, Isabel Millána, Francisco Amorósa
a Servicio de Nefrología, Hospital General Universitario de Elche, Alicante,
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    "textoCompleto" => "<p class="elsevierStylePara"><span class="elsevierStyleBold">To the Editor&#44;</span></p><p class="elsevierStylePara"><span class="elsevierStyleItalic">Nefrolog&#237;a </span>has recently published a case of post-denosumab hypocalcaemia and we would like to contribute to this subject<span class="elsevierStyleSup">1</span>&#46; Denosumab is an anti-RANKL &#40;receptor activator of nuclear factor<span class="elsevierStyleItalic">-&#954;</span> B ligand&#41; monoclonal antibody used in osteoporosis treatment as an antiresorptive agent&#46; Unlike bisphosphonates&#44; denosumab does not appear to be nephrotoxic<span class="elsevierStyleSup">2</span>&#44; nor does it require dosage adjustments in kidney failure due to its favourable pharmacokinetic and pharmacodynamic profile<span class="elsevierStyleSup">1&#44;3</span>&#46; However&#44; the qualitative bone changes in osteoporosis patients are not comparable with the wide spectrum of alterations in bone turnover that accompanies chronic kidney disease &#40;CKD&#41;<span class="elsevierStyleSup">4</span>&#46; For this reason and in relation to the changes in mineral metabolism caused by denosumab&#44; its safety in this population could be questioned&#46; We describe a patient with advanced CKD with extreme hypocalcaemia and hyperparathyroidism following continuous administration of denosumab&#46;</p><p class="elsevierStylePara">The patient is a 75-year-old female who sought treatment for tremors&#44; muscle spasms and paraesthesia in the limbs&#46; Stage 5 CKD&#44; probably secondary to nephroangiosclerosis and diabetes mellitus&#44; stands out in her medical history&#46; She is allergic to penicillin and is treated with insulin&#44; doxazosin&#44; nifedipine GITS&#44; torsemide&#44; acetylsalicyclic acid&#44; oral iron&#44; erythropoietin&#44; paricalcitol and calcifediol&#46; She was treated&#44; until 7 months before&#44; with 70mg alendronic acid&#44; which was suspended on starting six-monthly subcutaneous 60mg denosumab&#46; Her nephrologist was unaware of the prescription of this drug&#46; She presented the following analysis&#58; creatinine 3&#46;6mg&#47;dl&#44; total corrected calcium 10&#46;06mg&#47;dl&#44; ionic calcium 5&#46;1mg&#47;dl&#44; phosphate 5&#46;1mg&#47;dl&#44; alkaline phosphatase 157U&#47;l&#44; bicarbonate 27&#46;6mmol&#47;l&#44; parathyroid hormone &#40;PTH&#41; 436pg&#47;ml&#44; 25-vitamin D 30&#46;2ng&#47;ml&#46; The evolution of the biochemical parameters until the last analysis 14 days after denosumab is shown in Figure 1&#46; The patient did not attend this last evaluation due to not feeling well&#46; Six days later&#44; she was examined in the Emergency Department&#58; urea 154mg&#47;dl&#44; creatinine 6mg&#47;dl&#44; total corrected calcium 4&#46;36mg&#47;dl&#44; ionic calcium 2&#46;4mg&#47;dl&#44; phosphate 6&#46;7mg&#47;dl&#44; magnesium 1&#46;3mg&#47;dl&#44; alkaline phosphatase 59U&#47;l&#44; bicarbonate 18&#46;6mmol&#47;l&#44; PTH 1900pg&#47;ml&#46; Electrocardiogram &#40;ECG&#41;&#58; 440ms corrected QT &#40;QTc&#41;&#46; Oral and intravenous calcium replacement and intravenous calcitriol were started&#44; with the disappearance of symptoms&#46; After 15 days of parenteral replacement&#44; the analytical parameters had normalised &#40;Figure 1&#41;&#58; ECG&#58; QTc 402ms&#46; PTH remained 1858pg&#47;ml&#46;</p><p class="elsevierStylePara">The recommendations for the use of denosumab in kidney failure are based on a clinical trial involving very few patients&#44; over a 16 week follow-up period and following only one dose of the drug<span class="elsevierStyleSup">3</span>&#46; In addition&#44; the authors excluded&#44; in part of the study&#44; those subjects with 1&#46;25-dihydroxyvitamin D levels &#60;30pg&#47;ml&#44; severe renal failure and PTH &#8805;110pg&#47;ml or kidney failure and PTH &#8805;300pg&#47;ml&#46; Even so&#44; 22&#37;-25&#37; of the cases with moderate-severe renal failure or patients on dialysis presented hypocalcaemia&#46; The authors recommend calcium and vitamin D supplements for its prevention&#46; In another clinical trial carried out over 36 months in post-menopausal women with CKD and estimated glomerular filtration rate &#62;15ml&#47;min&#44; cases of hypoparathyroidism&#44; hyperparathyroidism&#44; hypercalcaemia and hypovitaminosis D were excluded&#59; PTH levels were not monitored in the study<span class="elsevierStyleSup">2</span>&#46;</p><p class="elsevierStylePara">In recent months&#44; cases of hypocalcaemia in chronic nephropathies have continued to be reported<span class="elsevierStyleSup">1&#44;5-8</span>&#46; Non previous biphosphonate use and kidney failure are risk factors for developing hypocalcaemia<span class="elsevierStyleSup">8</span>&#46; Consequently&#44; our patient may only have developed hypocalcaemia following the second dose&#44; since she had previously been treated with alendronate&#46;</p><p class="elsevierStylePara">Denosumab reduces the number of osteoclasts and bone formation rate&#46; Hypocalcaemia would be related to the rapid mineral deposit of calcium in the new bone matrix&#44; which would behave similarly to a hungry bone following parathyroidectomy<span class="elsevierStyleSup">3</span>&#46; However&#44; as occurred in this case&#44; PTH was not suppressed&#44; but hyperstimulated&#46; In addition to sudden hypocalcaemia following the second denosumab dose&#44; PTH levels were progressively increasing to very high levels following the first dose&#44; despite vitamin D supplements&#59; we also observed a reduction of alkaline phosphatase&#46; For some experts&#44; this inhibition of osteoclastogenesis could favour adynamic bone disease in CKD<span class="elsevierStyleSup">4&#44;5</span>&#46;</p><p class="elsevierStylePara">The monitoring of calcium levels 8-14 days after treatment has been advised<span class="elsevierStyleSup">7</span>&#46; However&#44; this does not guarantee its prevention&#44; since it is not known when the nadir is reached<span class="elsevierStyleSup">7</span>&#46;</p><p class="elsevierStylePara">Denosumab can cause potentially fatal short-term adverse effects&#44; as well as other unknown long-term effects&#44; on the bone of CKD patients&#46; For these reasons&#44; some authors recommend not using denosumab in CKD patients or only using it if a bone biopsy has previously been carried out<span class="elsevierStyleSup">4&#44;6</span>&#46;</p><p class="elsevierStylePara">&#160;</p><p class="elsevierStylePara"><span class="elsevierStyleBold">Conflicts of interest</span></p><p class="elsevierStylePara">The authors declare that they have no conflicts of interest related to the contents of this article&#46;</p><p class="elsevierStylePara"><a href="grande&#47;12383&#95;16025&#95;60197&#95;en&#95;f112383&#46;jpg" class="elsevierStyleCrossRefs"><img src="12383_16025_60197_en_f112383.jpg" alt="Evolution of biochemical parameters"></img></a></p><p class="elsevierStylePara">Figure 1&#46; Evolution of biochemical parameters</p>"
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Nefrología (English Edition)