Neonatal severe hyperparathyroidism: genotype/phenotype correlation and the use of pamidronate as rescue therapy

European Journal of Pediatrics
Simon WallerWilliam G van't Hoff

Abstract

Familial hypocalciuric hypercalcaemia (FHH) is an autosomal dominant condition due to heterozygous loss of function calcium sensing receptor (CaSR) mutations. However, individuals who are homozygous for CaSR mutations have neonatal severe hyperparathyroidism (NSHPT), which unlike the relatively benign and asymptomatic FHH can be fatal without parathyroidectomy. We report three patients with NSHPT associated with marked hypercalcaemia and severe hyperparathyroidism with related skeletal demineralisation. We describe the novel use of intravenous pamidronate in NSHPT, to control severe hypercalcaemia in these patients prior to parathyroidectomy and in one individual as a rescue therapy to stabilise life-threatening demineralisation. Furthermore, a marked phenotypic heterogeneity was observed amongst four members from a large kindred with the same homozygous CaSR mutations: one patient would have died without parathyroidectomy in infancy; a second patient survived infancy but underwent parathyroidectomy in early childhood following severe symptomatic hypercalcaemic episodes; whilst the other two patients have survived to adolescence without parathyroidectomy. Additionally, in contrast to the literature these two individuals suffere...Continue Reading

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