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Diabetes, Vol 44, Issue 2 165-172, Copyright © 1995 by American Diabetes Association
Bedtime insulin/daytime glipizide. Effective therapy for sulfonylurea failures in NIDDM
ML Shank, S Del Prato and RA DeFronzo
Diabetes Division, University of Texas Health Science Center, San Antonio 78284.
Bedtime insulin (BI)/daytime sulfonylurea (DSU) therapy was studied
double-blind in 30 non-insulin-dependent diabetes mellitus subjects in whom
sulfonylurea (SU) therapy had failed. Subjects were switched to glipizide
for 2 months (phase I) to confirm failure (fasting plasma glucose [FPG]
12.0 +/- 0.4 mmol/l) and then randomly assigned into three groups: BI-DSU;
BI-no DSU; and DSU-no BI. During phase II (3 months), the BI dose was fixed
(20 U/1.73 m2, low-dose). In phase III (3 months), BI was titrated up
(high-dose) to achieve good control or until hypoglycemic symptoms
prevented further dose increases. In phase IV (6 months), 25 of the 30
original subjects received open-labeled, high-dose BI-DSU. Low-dose BI-DSU
markedly reduced FPG (13.6 +/- 0.8 to 8.0 +/- 0.6 mmol/l, P < 0.001),
mean 24-h glucose (P < 0.001), HbA1c (8.9 +/- 0.7 to 7.6 +/- 0.3%, P =
0.07), and basal hepatic glucose production (HGP) (P < 0.005). A
positive correlation (r = 0.69, P < 0.05) between the declines in FPG
and HGP was observed. Neither low-dose BI alone nor DSU alone reduced FPG,
mean 24-h glucose, HbA1c, or basal HGP. High-dose (40 +/- 5 U/day) BI plus
DSU further reduced the FPG (6.3 +/- 0.6 mmol/l), HbA1c (7.1 +/- 0.3%),
mean 24-h plasma glucose, and basal HGP (all P < 0.05 vs. phase
II).(ABSTRACT TRUNCATED AT 250 WORDS)

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Copyright © 1995 by the American Diabetes Association.
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