Annals of internal medicine
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Findings in a case of neonatal tetany in a child whose mother had elevated blood parathyroid hormone levels because of a parathyroid adenoma are given. The child was found to have hypocalcemia, hypomagnesemia, and hyperphosphatemia. ⋯ It has been postulated that the pathophysiologic mechanism of the hypocalcemia in this syndrome is transient hypoparathyroidism. The present case suggests a different mechanism: hypomagnesemia and end-organ refractoriness to parathyroid hormone, a state analogous to pseudohypoparathyroidism.