The Bone and Mineral Disorder in Patients Undergoing Chronic Peritoneal Dialysis

Disorders of mineral metabolism and bone disease are common complications in CKD patients. They are very complex and involve a number of feedback loops between the kidney, bone, intestine, and the vasculature associated with an increased morbidity and mortality and decreased quality of life of the patients. The work group of the kidney disease: Improving Global Outcomes (KDIGO) recommended in 2006 the use of the term chronic kidney disease-mineral and bone disorder (CKD-MBD) to describe a systemic disorder that incorporates these abnormalities. Compared to hemodialysis (HD), patients undergoing peritoneal dialysis (PD) appear to have an increased prevalence of low turnover bone disease defined as adynamic bone disease (ABD). The most important risk factors for ABD are age, oversuppression of parathyroid hormone (PTH) with vitamin D, diabetes, circulating antagonist PTH fragments, and frequent presence of a positive calcium balance, which may result in an oversuppression of PTH. PTH levels and bone phosphatase alkaline (bALP) should be assessed among such patients as the earliest markers of abnormal mineral and bone metabolism. Treatments considered are interventions to treat hyperphosphatemia, hyperparathyroidism, and bone disease. The optimal management of chronic kidney disease-mineral and bone disorder (CKD-MBD) includes the prevention of vascular calcifications