Endocrine function of the pancreas in tumors of the chiasmal-sellar region

Usvatova, I.I.; Tenedieva, V.D.; Fedorov, S.N.; Mikrikova, L.V.; Arestov, O.G.

Problemy Endokrinologii 31(4): 9-13

1985


ISSN/ISBN: 0375-9660
PMID: 3900983
Document Number: 254070
A clinicobiochemical study of 10 patients with tumors of the chiasmal sellar region and 8 healthy persons using the i. v. glucose tolerance test (IGTT) made it possible to reveal disorder of pancreatic alpha- and beta-cell function in the patients with tumors. A distinct picture of the chiasmal sellar process with the involved hypothalamus was clinically determined in all the patients. Radioimmunoassay of immunoreactive insulin, glucagon, C-peptide and glucose revealed fasting hyperinsulinemia in the presence of both hypo- and hyperglycemia. The latter was accompanied by a raised level of glucagon in the blood. The IGTT revealed in the patients with tumors of the chiasmal sellar region hyperreactivity of beta-cells and a decrease in the sensitivity of alpha-cells to glucose as well as glucose tolerance that may be both regarded as pathogenetic factors of the development of a prediabetic condition in such patients.

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