Childhood and adolescence are crucial times for the development of a healthy skeletal and cardiovascular system. Disordered mineral and bone metabolism accompany chronic kidney disease (CKD) and present significant obstacles to optimal bone strength, final adult height, and cardiovascular health. Decreased activity of renal 1 alpha hydroxylase results in decreased intestinal calcium absorption, increased serum parathyroid hormone levels, and high-turnover renal osteodystrophy, with subsequent growth failure. Simultaneously, phosphorus retention exacerbates secondary hyperparathyroidism, and elevated levels contribute to cardiovascular disease. Treatment of hyperphosphatemia and secondary hyperparathyroidism improves growth and high-turnover bone disease. However, target ranges for serum calcium, phosphorus, and parathyroid hormone (PTH) levels vary according to stage of CKD. Since over-treatment may result in adynamic bone disease, growth failure, hypercalcemia, and progression of cardiovascular calcifications, therapy must be carefully adjusted to maintain optimal serum biochemical parameters according to stage of CKD. Newer therapeutic agents, including calcium-free phosphate binding agents and new vitamin D analogues, effectively suppress serum PTH levels while limiting intestinal calcium absorption and may provide future therapeutic alternatives for children with CKD.

译文

童年和青春期是发展健康骨骼和心血管系统的关键时期。矿物质和骨代谢紊乱伴随着慢性肾脏病 (CKD),并对最佳骨强度,最终成人身高和心血管健康构成重大障碍。肾1α 羟化酶活性降低导致肠钙吸收减少,血清甲状旁腺激素水平升高和高更新性肾性骨营养不良,随后出现生长衰竭。同时,磷保留会加剧继发性甲状旁腺功能亢进,而水平升高会导致心血管疾病。高磷血症和继发性甲状旁腺功能亢进的治疗可改善生长和高更替性骨病。然而,血清钙,磷和甲状旁腺激素 (PTH) 水平的目标范围根据CKD的阶段而变化。由于过度治疗可能会导致骨骼疾病,生长衰竭,高钙血症和心血管钙化的进展,因此必须根据CKD的阶段仔细调整治疗以保持最佳的血清生化参数。新型治疗剂,包括无钙磷酸盐结合剂和新的维生素d类似物,可有效抑制血清PTH水平,同时限制肠道钙的吸收,并可能为CKD儿童提供未来的治疗选择。

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