title: Effect of adding a sulfonylurea in patients with non-insulin-dependent diabetes mellitus previously well controlled with insulin.
abstract: OBJECTIVE
  To determine whether insulin-requiring patients with non-insulin-dependent diabetes mellitus (NIDDM) and good glycemic control would benefit in weight control, serum lipid concentrations, or blood pressure from a reduction in exogenous insulin treatment.
  
  
  METHODS
  Eighteen patients with well-controlled NIDDM who required insulin therapy were entered into a randomized, placebo-controlled, double-blind, crossover study of the addition for 12 weeks of treatment with a second-generation sulfonylurea agent (micronized glyburide).
  
  
  RESULTS
  The mean fasting plasma glucose at entry was 7.00 +/- 0.22 mmol/L and at the end of the 12-week treatment phase was 7.67 +/- 0.39 mmol/L with placebo and 7.28 +/- 0.44 mmol/L with active drug. Hemoglobin A(1c) was unchanged during the study (7.5 +/- 0.2% at entry, 7.5 +/- 0.3% with placebo, and 7.4 +/- 0.3% with active drug). Addition of the orally administered agent resulted in a 29% decrease in exogenous insulin requirements and a 37% increase in 24-hour urinary C-peptide excretion. Patients had no change in weight after 12 weeks of either placebo or active drug. Plasma cholesterol levels declined slightly during the study, but they did not differ significantly during drug and placebo treatment. Blood pressure was unchanged in both the subjects with and without hypertension.
  
  
  CONCLUSIONS
  In patients with NIDDM and good glycemic control with insulin treatment, a glyburide-related increase in endogenous insulin secretion caused a proportionate decrease in exogenous insulin requirements. With continued good glycemic control, however, the orally administered agent showed no additional benefit on weight, blood pressure, plasma triglycerides, or low-density lipoprotein or high-density lipoprotein cholesterol.
authors.affiliation: Department of Internal Medicine, The University of Texas Medical Branch at Galveston, Galveston, Texas 77555-1060, USA.
authors.forename: C A
authors.initials: CA
authors.lastname: Stuart
authors.forename: C R
authors.initials: CR
authors.lastname: Gilkison
authors.forename: R F
authors.initials: RF
authors.lastname: Carlson
authors.forename: C A
authors.initials: CA
authors.lastname: Stuart
authors.forename: C R
authors.initials: CR
authors.lastname: Gilkison
authors.forename: R F
authors.initials: RF
authors.lastname: Carlson