Reduction in urine C-peptide clearance rate after metabolic control in NIDDM patients.
One hour urine C-peptide and creatinine clearance rates were determined simultaneously in 25 hospitalized patients with non-insulin-dependent diabetes mellitus (NIDDM) undergoing sulfonylurea and/or diet treatment. The studies had been performed after an overnight fast on the second day of admission and on a day soon before discharge, with intervals of 18.9 +/- 7.0 days. Fasting plasma glucose (FPG) and hemoglobin A1c (HbA1c) values decreased significantly at the second examination as compared to the initial values (FPG: 101 +/- 20 mg/dl vs. 161 +/- 47 mg/dl, p less than 0.005; HbA1c: 7.3 +/- 1.5% vs. 8.4 +/- 1.7%, p less than 0.005). The urine C-peptide clearance rate also decreased significantly after metabolic control (0.75 +/- 0.36 l/hr vs. 1.06 +/- 0.54 l/hr, p less than 0.005). Meanwhile, the urine creatinine clearance rate tended to decrease, but the difference was not significant (3.69 +/- 2.04 l/hr vs. 4.87 +/- 2.98 l/hr) at the second examination. The data suggest that the urine C-peptide clearance rate is susceptible to the effects of the fluctuation of metabolic states in NIDDM patients. In order to use urinary C-peptide for a follow up study of pancreatic B-cell secretion, the changes in C-peptide clearance under various metabolic conditions must be taken into account.
Hsieh
S D
SD
Division of Endocrinology and Metabolism, Jichi Medical School, Tochigi-ken, Japan.
Iwamoto
Y
Y
Matsuda
A
A
Kuzuya
T
T
D000328:Adult; D000368:Aged; D001786:Blood Glucose / Q000378:metabolism; D002096:C-Peptide / Q000652:urine*; D003924:Diabetes Mellitus, Type 2 / Q000378:metabolism / Q000652:urine*; D005260:Female; D006801:Humans; D007668:Kidney / Q000503:physiopathology; D008297:Male; D008875:Middle Aged
D001786:Blood Glucose; D002096:C-Peptide