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Beneficial Effects of Insulin on Glycemic Control and β-Cell Function in Newly Diagnosed Type 2 Diabetes With Severe Hyperglycemia After Short-Term Intensive Insulin Therapy

¹ Division of Endocrinology and Metabolism, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
² Section of Biochemistry, Department of Pathology and Laboratory Medicine, Taipei Veterans General Hospital, Taipei, Taiwan
³ National Yang-Ming University School of Medicine, Taipei, Taiwan

Corresponding author: Hong-Da Lin, chenhs{at}vghtpe.gov.tw

OBJECTIVE—To evaluate whether treatment with insulin is advantageous compared with oral antidiabetes agents in newly diagnosed type 2 diabetes with severe hyperglycemia after short-term intensive insulin therapy.

RESEARCH DESIGN AND METHODS—Newly diagnosed type 2 diabetic patients with severe hyperglycemia were hospitalized and treated with intensive insulin injections for 10–14 days. The oral glucose tolerance test (OGTT) was performed after intensive insulin treatment. After discharge, the patients were randomized to receive either insulin injections or oral antidiabetes drugs (OADs) for further management. The OGTT was repeated 6 months later, and β-cell function and insulin sensitivity were evaluated again. These subjects were continually followed up for another 6 months to evaluate their long-term glycemic control.

RESULTS—At the 6th month of the study, the A1C level was significantly lower in the insulin group than in the OAD group (6.33 ± 0.70% vs. 7.50 ± 1.50%; P = 0.002). During the follow-up visit, the A1C level was still better in the insulin group (6.78 ± 1.21% vs. 7.84 ± 1.74%; P = 0.009). All parameters regarding β-cell function measured in the OGTT were improved significantly in both groups after 6 months of treatment. Compared with the OAD group, the homeostasis model assessment of β-cell function index, insulin area under the curve, and insulinogenic index were better in the insulin group.

CONCLUSIONS—A 6-month course of insulin therapy, compared with OAD treatment, could more effectively achieve adequate glycemic control and significant improvement of β-cell function in new-onset type 2 diabetic patients with severe hyperglycemia.

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