[Pathophysiology and classitication of parathyroidism].

Hypoparathyroidism is characterized by decreased actions of parathyroid hormone (PTH) either by reduced secretion of or resistance to PTH. The understanding in the pathogenesis of hypoparathyroidism has been greatly increased by recent findings in genetic abnormalities of patients with hypoparathyroidism. A new classification of hypoparathyroidism based upon these genetic abnormalities is proposed, and a diagnostic approach to patients with hypoparathyroidism is summarized.