title: Plasma C-peptide in long-standing type 1 diabetics with and without microvascular disease.
abstract: Plasma C-peptide levels were measured both in the fasting state and in response to a standard breakfast in 37 Type 1 (insulin dependent) diabetics with severe proliferative retinopathy, 20 Type 1 diabetics without complications and 13 non-diabetic subjects. The two diabetic groups were matched for age and duration of diabetes. Seventeen out of 37 subjects with diabetic complications had detectable C-peptide compared with three out of 20 in the group without complications (p less than 0.05). There was a significant correlation between fasting C-peptide levels when present and the increment in C-peptide (r = 0.89, p less than 0.0001). There was no correlation between C-peptide levels and the fasting blood glucose or HbA1. No evidence was found to support the hypothesis that in long-term diabetics, sufficient beta-cell function may persist which measurably influences diabetic control and prevents the development of microvascular complications.
mesh_terms: D000328:Adult; D001786:Blood Glucose / Q000378:metabolism; D002096:C-Peptide / Q000097:blood*; D003920:Diabetes Mellitus / Q000097:blood*; D003930:Diabetic Retinopathy / Q000097:blood*; D005215:Fasting; D005260:Female; D006441:Hemoglobin A / Q000378:metabolism; D006801:Humans; D007700:Kinetics; D008297:Male; D008875:Middle Aged; D010455:Peptides / Q000097:blood*
chemical_list: D001786:Blood Glucose; D002096:C-Peptide; D010455:Peptides; D006441:Hemoglobin A