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      Comparison of the subcutaneous absorption of insulin glargine (Lantus) and NPH insulin in patients with Type 2 diabetes.

      Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et métabolisme
      Adult, Aged, Blood Glucose, metabolism, C-Reactive Protein, Cross-Over Studies, Diabetes Mellitus, Type 2, drug therapy, Double-Blind Method, Half-Life, Humans, Hypoglycemic Agents, administration & dosage, pharmacokinetics, Injections, Subcutaneous, Insulin, analogs & derivatives, Insulin, Isophane, Insulin, Long-Acting, Iodine Radioisotopes, Middle Aged, Scintillation Counting, Skin Absorption

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          Abstract

          The aim of this study was to compare the subcutaneous absorption characteristics of insulin glargine with NPH insulin in patients with Type 2 diabetes. In this single-dose, double-blind, randomized, two-way crossover study, 14 patients with Type 2 diabetes (aged 40-70 years) previously untreated with insulin were randomized to receive in a fasting state either a single subcutaneous injection of 0.3 U/kg 125I-insulin glargine or 0.3 U/kg 125I-NPH insulin. The disappearance of radioactivity was monitored for forty-eight hours. The median time for 25%, 50% and 75% of the radioactivity to disappear from the injection site was significantly longer for insulin glargine compared with NPH insulin (T75% 15.0 and 6.5 h, p=0.009; T50% 26.3 and 13.4 h, p=0.009; T25% 42.4 and 26.6 h, p=0.019, respectively). The mean residual radioactivity remaining at 24, 36 and 48 h after injection remained significantly higher than NPH insulin (54.4 and 27.9%, p=0.0001; 35.0 and 17.0%, p=0.003; 19.2 and 9.2%, p=0.01, respectively). Mean plasma glucose levels reached a minimum after 14.6 and 9 h in response to insulin glargine and NPH insulin, respectively. The subcutaneous absorption of insulin glargine in fasting Type 2 diabetes patients was significantly (2-3 times) slower compared with NPH insulin in patients with Type 2 diabetes. The slower absorption of insulin glargine correlated with the fall in plasma glucose levels over a 24 h period compared with the faster insulin absorption and more rapid decrease in plasma glucose levels observed in response to NPH insulin. Both insulin glargine and NPH insulin were well tolerated.

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