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We have evaluated the residual pancreatic B cell function by glucagon load test in 28 patients with non-insulin-dependent diabetes mellitus (NIDDM) of a duration of 20 years or more. The increase in serum C-peptide at 6 minutes after glucagon administration (delta C-peptide) was used as an index of residual B cell function. There was much less delta C-peptide in patients treated with insulin than in those treated with sulfonylurea (p less than 0.05), and it was significantly correlated with the body mass index (r = 0.40, p less than 0.05). Long term metabolic control assessed by the average annual mean fasting blood glucose for the observation period (mean, 21 years) was not correlated with delta C-peptide (r = -0.13). The prevalence of retinopathy which needed photocoagulation therapy and of neuropathy in patients with poor residual B cell function (delta C-peptide less than or equal to 0.3 ng/ml) was the same as that in those with good residual B cell function (delta C-peptide greater than or equal to 1.0 ng/ml). The present study shows that the residual B cell function is not correlated with long term glycemic control and the prevalence of diabetic complications in long-standing NIDDM patients.

Residual B Cell Function in Patients with Long-Standing NIDDM and its Relation to Metabolic Control and Diabetic Complications.