Abstract

RESTREPO, César Augusto; CASTILLO, Campo Elías  and  SANZ, María Fernanda. Serial intranodular application of paricalcitol Is effective in the treatment of secondary refractory hyperparathyroidism?. Acta Med Colomb [online]. 2015, vol.40, n.2, pp.125-131. ISSN 0120-2448.

Objective: go determine the effectiveness of paricalcitol in reducing the levels of intact PTH (iPTH) when applied directly on the parathyroid glands in patients with Grade 5 chronic kidney disease (CKD G5) with refractory hyperparathyroidism and nodular hyperplasia in dialysis therapy. Materials and methods: CKD G5 patients on dialysis therapy with refractory secondary hyperparathyroidism in whom through neck echography hyperplasia of more than one parathyroid gland characterized by a volume greater than 500 mm³ was detected. Through directed ultrasound guidance to each patient 0.5 cc (2.5ugs) of paricalcitol (Zemplar®) was applied in each hyperplasticgland regardless of size and according to the group. Group 1 (G1) received weekly paricalcitol for up to two glands per session always on the same side, for a total of two doses per gland; Group 2 (G2) received paricalcitol every 15 days in similar scheme as group 1 for a total of two doses per gland and finally for group 3 (G3) paricalcitol each month, but in every session all the glands were injected for a total four doses per gland. Design: intervention study with no control group. Statistical analysis: an assessment whether the intervention resulted in significant reduction in iPTH and variables calcium, phosphorus, calcium x phosphorus and alkaline phosphatase, was made. Results: In G1 (six patients), a statistically significant decrease between the average level of initial iPTH and iPTH at 30 days of starting treatment (p = 0.0077), but not at 51 or 81 days was found. In G2 (six patients) by comparing the initial iPTH, with the detected value at 51, 75, 105 and 135 days post-application of the last dose of paricalcitol, there were no significant changes. In G3 (four patients) relative to the initial iPTH there was significant reduction in their values at 60 days (p = 0.012), 120 days (p = 0.0099) and 180 days (p = 0.00095), but not at 240 days (p = 0.214049). On the other variables (calcium, phosphorus, calcium x phosphorus, alkaline phosphatase), no significant changes were detected in either group. No major complications occurred. Conclusions: in patients with CKD G5 in dialysis therapy and refractory secondary hyperparathyroidism, administration of intranodular paricalcitol achieves significantly lower levels of iPTH, as long as it is administered in groups of two glands with a time interval not exceeding one week, or by simultaneous monthly administration of all glands. (Acta Med Colomb 2015; 40:125-131).

Keywords : chronic kidney disease; secondary hyperparathyroidism; paricalcitol.

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