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  • Title: Paradoxical acute hypercalcemic effect of salmon calcitonin in patients having Paget's disease of bone after treatment with dichloromethylene diphosphonate.
    Author: Delmas PD, Chapuy MC, Meunier PJ.
    Journal: Horm Metab Res; 1984 May; 16(5):258-61. PubMed ID: 6234216.
    Abstract:
    The hypocalcemia following administration of calcitonin may be an index to disease activity in Paget's disease of bone. Therefore, we assessed the effect of a single injection of 100 MRC units of salmon calcitonin (SCT) on plasma calcium in 28 patients with active Paget's disease before and after 6 months of treatment with dichloromethylene diphosphonate (Cl2MDP) at a dose of 400 mg/day (3 patients), 800 mg/day (8 patients), 1.600 mg/day (9 patients) or 2.600 mg/day (8 patients). The mean SCT-induced hypocalcemia was reduced by Cl2MDP and there was a significant positive correlation between the decrease of serum calcium induced by SCT and bone resorption evaluated by the number of osteoclasts on bone biopsy taken in pagetic iliac crest. After Cl2MCP treatment, 5 patients manifested a paradoxical hypercalcemic response to SCT injection ranging from +0.3 mg/dl to +0.5 mg/dl, which was sustained over the 9 hours following injection. As these patients had a dramatic inhibition of bone resorption induced by Cl2 MDP, it is suggested that the hypercalcemic response to SCT might reflect persistence or exaggeration of the early hypercalcemic effect of CT which reportedly precedes the hypocalcemic response to SCT.
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