A1C is associated with intima-media thickness in individuals with normal glucose tolerance.
OBJECTIVE
One-hour glucose during an oral glucose tolerance test (OGTT) was recently proposed as a valuable marker to identify individuals with normal glucose tolerance (NGT) and increased intima-media thickness (IMT). However, central markers of glycemic control were not considered. The aim of this study was to identify which marker of glycemic control is most informative with respect to the variation of IMT in individuals with NGT.


METHODS
Cardiovascular risk factors, glucose metabolism (OGTT), and IMT were determined in 1,219 nondiabetic individuals (851 women, 368 men; 558 with NGT).


RESULTS
One-hour glucose and A1C levels were significantly correlated to carotid IMT in individuals with NGT, whereas fasting and 2-h glucose levels were not informative. Only A1C was associated with IMT independent of other confounders, whereas 1-h glucose was not informative. Comparable results were found in the total cohort, including individuals with IFG and IGT.


CONCLUSIONS
A1C was the most informative glycemic marker with respect to IMT in individuals with NGT.
Bobbert
Thomas
T
Department of Endocrinology, Diabetes and Nutrition, Charité-Universitätsmedizin Berlin, Berlin, Germany.
Mai
Knut
K
Fischer-Rosinsky
Antje
A
Pfeiffer
Andreas F H
AF
Spranger
Joachim
J
D001786:Blood Glucose / Q000378:metabolism; D005260:Female; D005951:Glucose Tolerance Test; D006442:Glycated Hemoglobin / Q000378:metabolism*; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D012307:Risk Factors; D017539:Tunica Intima / Q000473:pathology*; D017540:Tunica Media / Q000473:pathology*
D001786:Blood Glucose; D006442:Glycated Hemoglobin