Calcium balance and negative impact of calcium load in peritoneal dialysis patients.
Like hemodialysis patients, peritoneal dialysis (PD) patients are facing an excessively increased burden of vascular and valvular calcification. According to some surveys, more than 80% of prevalent PD patients are complicated with vascular calcification, and more than one third have heart valve calcification. Dysregulated phosphate metabolism is well recognized to play an important role in inducing vascular calcification, but increasing evidence is suggesting that dysregulated calcium metabolism also promotes vascular calcification and might in fact be more potent than phosphate in inducing that calcification. Growing evidence from randomized controlled trials shows more progression of vascular calcification and higher mortality among chronic kidney disease (CKD) patients receiving calcium-based phosphate binders than among those receiving non-calcium-containing phosphate binders. Those results raise important safety concern about the use of high-dose calcium-based phosphate binders in the CKD population, including both non-dialysis and dialysis patients (especially anuric dialysis patients), who have markedly reduced urinary calcium excretion. To prevent calcium overload, this review recommends restricting the dose of calcium-based phosphate binders in CKD patients, especially those who are elderly, who have increased cardiovascular risk, who already have baseline vascular or valvular calcification, or who have low intact parathyroid hormone and adynamic bone disease.
Department of Medicine, Queen Mary Hospital, University of Hong Kong, Hong Kong SAR, PR China.
Angela Yee-Moon
AY
Wang
D002114:Calcinosis / Q000517:prevention & control; D002118:Calcium / Q000008:administration & dosage / Q000378:metabolism*; D015314:Dialysis Solutions / Q000378:metabolism; D018450:Disease Progression; D006706:Homeostasis / Q000502:physiology; D006801:Humans; D010530:Peritoneal Dialysis; D010710:Phosphates / Q000378:metabolism; D051436:Renal Insufficiency, Chronic / Q000378:metabolism / Q000628:therapy*; D012307:Risk Factors
D015314:Dialysis Solutions; D010710:Phosphates; D002118:Calcium
Calcium balance; calcium-based phosphate binders; vascular calcification