Insulin Secretion in Patients with Hyperthyroidism: in Relation to Abnormalities in Carbohydrate Metabolism
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概要
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Oral glucose tolerance tests (OGTT) were performed on108patients with hyperthyroidism who were suspected, from their clinical records, of having abnormalities in carbohydrate metabolism. Of these, intravenous glucose tolerance tests (IVGTT) were performed on24patients and intravenous tolbutamide tests (IVTT) on34. Five control subjects were included in the study. In OGTT, an oxyhyperglycemic pattern (OH) was observed in31patients, a borderline pattern in13, and a diabetic pattern with FBS<120mg/d<I>l</I> (Da) in31, FBS: 120-139mg/d<I>l</I> (Db) in11, and FBS≥140mg/d<I>l</I> (Dc) in 22.<BR>Insulin secretory response (ISR) during OGTT increased in the OH group, slightly increased in the Da group, and decreased in the Db and Dc groups, compared with the control group. The insulinogenic index (ΔIRI/ΔBS·E30) during OGTT was higher in the OH group but was significantly lower in the Da, Db, Dc groups than in the control group.<BR>K-value and insulinogenic index (ΔIRI/ΔBS·E3) during IVGTT were2.3±0.45 and 0.10±0.07 (mean±SD, n=5) in the control group, 2.81±1.66 and 0.56±0.25 (n=6) in the OH group, 1.51±0.29 and 0.25±0.15 (n=9) in the Da group, 0.88±0.32 and 0.04±0.03 (n=5) in the Db group, and 0.75±0.11 and 0.00±0.11 (n=4) in the Dc group. While ISR significantly increased in the OH and Da groups during IVTT, the fall of the blood glucose level after tolbutamide administration was similar or suppressed, compared with the control group. Although ISR decreased after the patients had been made euthyroid, there was an increase in glucose disappearance in almost all of the patients.<BR>These findings suggest the following:(1) patients who have an ISR capacity in accordance with that required in a hyperthyroid state may be included in the OH group and patients who do not have it, although they have a sufficient insulin secretory capacity in an euthyroid state, may be included in the Da group;(2) ISR may decrease in most hyperthyroid patients with FBS≥120mg/d<I>l</I>;(3) there may be peripheral insulin resistance in hyperthyroidism.
- 社団法人 日本内分泌学会の論文
著者
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Wada Masahisa
Second Dept. Of Intern. Med. Osaka City Univ. School Of Med.
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Hamada Noboru
Ito Hospital
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Morii Hirotoshi
Second Department Of Internal Medicine Osaka City University Medical School
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MIMURA Takashi
Ito Hospital
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Ito Kunihiko
Ito Hospital
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Momotani Naoko
Ito Hospital
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NISHIKAWA YOSHIHIKO
Ito Hospital
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BAN YOSHIO
Ito Hospital
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FUJII SATORU
Ito Hospital
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MORII HIROTOSHI
Second Department of Internal Medicine Osaka City University
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WADA MASAHISA
Second Department of Internal Medicine Osaka City University Meaical School
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