title: Diurnal blood pressure abnormalities are related to endothelial dysfunction in patients with non-complicated type 1 diabetes.
abstract: Patients with diabetes have an increased cardiovascular morbidity and mortality despite interventions to prevent these outcomes. Abnormalities in diurnal blood pressure patterns are also associated with excess cardiovascular mortality. The aim of this study was to determine the effects of diurnal blood pressure patterns on endothelial function and oxidative stress in patients with uncomplicated type 1 diabetes mellitus. Thirty-two normotensive and normoalbuminuric type 1 diabetic patients (21 dipper and 11 nondipper) and 37 healthy (27 dipper and 10 nondipper) volunteers underwent 24-h ambulatory blood pressure monitoring. Their endothelial functions were evaluated using flow mediated dilatation (FMD) and by measuring nitric oxide and thiobarbituric acid reactive substances (TBARS). Dippers were defined as subjects who exhibited an average reduction in both systolic and diastolic blood pressure of greater than 10% between day and night periods. Nondipper type 1 diabetic patients and controls had nighttime systolic and diastolic blood pressure values that were significantly higher than those of dipper diabetic patients (p<0.05) and dipper controls (p<0.01). Values of FMD for nondipper diabetic patients (5.12+/-2.2%) were significantly lower than those in dipper diabetic patients (10.19+/-2.5%, p<0.01), nondipper (10.08+/-2.9%, p<0.001) and dipper controls (11.76+/-3.8%, p<0.001). Additionally, levels of TBARS in the dipper diabetic group and dipper controls were significantly lower than those in the nondipper diabetic group (p<0.05). In conclusion, only type 1 diabetic patients with a nondipping pattern of blood pressure exhibited changes that may lead to endothelial dysfunction and atherosclerosis. (Hypertens Res 2008; 31: 2065-2073).
authors.affiliation: Department of Internal Medicine, Section of Endocrinology and Metabolism, Marmara University School of Medicine, Barbaros Mah. Baskan Sok. Bilgen Konutlari B Blok Daire 20, 34662, Uskudar, Istanbul, Turkey. odeyneli@marmara.edu.tr
authors.forename: Oguzhan
authors.initials: O
authors.lastname: Deyneli
authors.forename: Dilek
authors.initials: D
authors.lastname: Yazici
authors.forename: Ahmet
authors.initials: A
authors.lastname: Toprak
authors.forename: Meral
authors.initials: M
authors.lastname: Yuksel
authors.forename: Hasan
authors.initials: H
authors.lastname: Aydin
authors.forename: Hakan
authors.initials: H
authors.lastname: Tezcan
authors.forename: Dilek Gogas
authors.initials: DG
authors.lastname: Yavuz
authors.forename: Sema
authors.initials: S
authors.lastname: Akalin
mesh_terms: D000328:Adult; D001794:Blood Pressure; D008078:Cholesterol, LDL / Q000097:blood; D002940:Circadian Rhythm / Q000502:physiology*; D003922:Diabetes Mellitus, Type 1 / Q000503:physiopathology*; D004730:Endothelium, Vascular / Q000502:physiology*; D005260:Female; D006442:Glycated Hemoglobin / Q000032:analysis; D006801:Humans; D008297:Male; D009569:Nitric Oxide / Q000096:biosynthesis; D017392:Thiobarbituric Acid Reactive Substances / Q000032:analysis; D014664:Vasodilation
chemical_list: D008078:Cholesterol, LDL; D006442:Glycated Hemoglobin; D009569:Nitric Oxide; D017392:Thiobarbituric Acid Reactive Substances; C517652:hemoglobin A1c protein, human