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(Circulation. 2004;109:1750-1755.)
© 2004 American Heart Association, Inc.
Clinical Investigation and Reports |
From the Departments of Clinical Physiology (M.J.J., J.O.T., O.T.R.), Clinical Chemistry (M.R.), Pediatrics (A.P.-L.), Medicine (T.R., J.V.) and the Research Centre of Applied and Preventive Cardiovascular Medicine (M.J.J.) and Turku PET-Centre (M.J.J., O.T.R.), University of Turku, Turku, Finland, and Laboratory of Atherosclerosis Genetics, Department of Clinical Chemistry, Centre for Laboratory Medicine (R.R., S.L., T.L.), Tampere University Hospital and University of Tampere, Tampere, Finland.
Correspondence to Mikko J. Järvisalo, Turku PET Centre, Turku University Hospital, Kiinamyllynkatu 4-8, FIN-20520 Turku, Finland. E-mail mikko.jarvisalo{at}utu.fi
Received October 14, 2003; revision received January 20, 2004; accepted January 22, 2004.
Background Endothelial dysfunction may play a pathophysiological role in the development of atherosclerosis in subjects with type 1 diabetes. We examined whether alterations in vascular endothelial function exist in children with type 1 diabetes and tested the hypothesis that endothelial dysfunction is associated with early structural atherosclerotic vascular changes in these children.
Methods and Results Noninvasive ultrasound was used to measure brachial artery flow-mediated dilation (FMD) responses and carotid artery intima-media thickness (IMT) in 75 children (mean age 11±2 years), 45 with type 1 diabetes (diabetes duration 4.4±2.9 years) and 30 healthy control children. Children with diabetes had lower peak FMD response (4.4±3.4% versus 8.7±3.6%, P<0.001) and increased IMT (P<0.001) compared with controls. Sixteen children with diabetes (36%) had endothelial dysfunction defined as total FMD response in the lowest decile for normal children. These children had increased carotid IMT (0.58±0.05 versus 0.54±0.04 mm, P=0.01) and higher LDL cholesterol concentration (2.63±0.76 versus 2.16±0.60 mmol/L, P=0.03) compared with diabetic children without endothelial dysfunction. Multivariate correlates of increased IMT included diabetes group (P=0.03), low FMD (P=0.03), and high LDL cholesterol (P=0.08).
Conclusions Impaired FMD response is a common manifestation in children with type 1 diabetes and is associated with increased carotid artery IMT. These data suggest that endothelial dysfunction in children with type 1 diabetes may predispose them to the development of early atherosclerosis.
Key Words: arteries atherosclerosis diabetes mellitus ultrasonics
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