Abstract:
BACKGROUND/AIMS:22q11.2 Deletion syndrome is a congenital malformation syndrome with hypoparathyroidism. The spectrum of parathyroid gland dysfunction ranges from severe neonatal hypocalcemia to subclinical hypoparathyroidism. The parathyroid hormone (PTH) secretory reserve is reduced in a significant number of 22q11.2 deletion syndrome patients with normocalcemia. The aim of this study was to investigate hypoparathyroid function using the bicarbonate infusion test for 22q11.2 deletion syndrome with normocalcemia. METHODS:sodium bicarbonate solution [7% (w/v); 40 ml/m(2) body surface area] was infused for 2 min, and blood samples for the determination of plasma ionized calcium and plasma intact PTH were serially obtained. The test was conducted on five 22q11.2 deletion syndrome patients with normocalcemia. RESULTS:two patients presented increments of intact PTH levels (peak value - basal value) of 70 pg/ml or higher during the test, whereas the remaining 3 showed PTH level increments of <30 pg/ml. The former 2 patients were diagnosed as having normal parathyroid gland function, and the latter 3 patients as having subclinical hypoparathyroidism. CONCLUSION:the bicarbonate infusion test may be a valuable method for the evaluation of residual parathyroid gland function in patients with 22q11.2 deletion syndrome. Screening of subclinical hypoparathyroidism should be considered in the regular follow-up of patients with 22q11.2 deletion syndrome, even in cases with normocalcemia.
journal_name
Horm Res Paediatrjournal_title
Hormone research in paediatricsauthors
Nagasaki K,Iwasaki Y,Ogawa Y,Kikuchi T,Uchiyama Mdoi
10.1159/000315904subject
Has Abstractpub_date
2011-01-01 00:00:00pages
14-8issue
1eissn
1663-2818issn
1663-2826pii
000315904journal_volume
75pub_type
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