BACKGROUND: An ankle-brachial index (ABI) value of 0.91-0.99 is considered borderline and associated with an increased risk of cardiovascular events. However, there is no information on the relationship between borderline ABI and endothelial function. METHODS AND RESULTS: We measured ABI and assessed vascular function by flow-mediated vasodilation (FMD) and nitroglycerin-induced vasodilation in 389 subjects who underwent health examinations. Subjects were divided into 3 groups according to ABI (normal group: 1.00-1.40, borderline group: 0.91-0.99, abnormal group: ≤0.90 or >1.40). FMD was significantly smaller in both the borderline and the abnormal group than in the normal group. There was no significant difference in the vascular responses to nitroglycerin between the normal and borderline groups. Vascular response to nitroglycerin was significantly higher in the normal group than in the abnormal group. Borderline and abnormal ABI values were significantly associated with an increased odds ratio of low tertile of FMD levels, using the normal ABI group as the reference. Multiple logistic regression analysis for FMD revealed that age, sex, hypertension, diabetes mellitus, and borderline ABI independently remained associated with FMD. CONCLUSIONS: ABI of 0.91-0.99 is associated with endothelial dysfunction. ABI examination is a simple and cost-effective method for obtaining the additional information on the initial step of atherosclerosis beyond the assessment of peripheral artery disease.
BACKGROUND: An ankle-brachial index (ABI) value of 0.91-0.99 is considered borderline and associated with an increased risk of cardiovascular events. However, there is no information on the relationship between borderline ABI and endothelial function. METHODS AND RESULTS: We measured ABI and assessed vascular function by flow-mediated vasodilation (FMD) and nitroglycerin-induced vasodilation in 389 subjects who underwent health examinations. Subjects were divided into 3 groups according to ABI (normal group: 1.00-1.40, borderline group: 0.91-0.99, abnormal group: ≤0.90 or >1.40). FMD was significantly smaller in both the borderline and the abnormal group than in the normal group. There was no significant difference in the vascular responses to nitroglycerin between the normal and borderline groups. Vascular response to nitroglycerin was significantly higher in the normal group than in the abnormal group. Borderline and abnormal ABI values were significantly associated with an increased odds ratio of low tertile of FMD levels, using the normal ABI group as the reference. Multiple logistic regression analysis for FMD revealed that age, sex, hypertension, diabetes mellitus, and borderline ABI independently remained associated with FMD. CONCLUSIONS: ABI of 0.91-0.99 is associated with endothelial dysfunction. ABI examination is a simple and cost-effective method for obtaining the additional information on the initial step of atherosclerosis beyond the assessment of peripheral artery disease.
Authors: Maria Teresa B Abola; Jonathan Golledge; Tetsuro Miyata; Seung-Woon Rha; Bryan P Yan; Timothy C Dy; Marie Simonette V Ganzon; Pankaj Kumar Handa; Salim Harris; Jiang Zhisheng; Ramakrishna Pinjala; Peter Ashley Robless; Hiroyoshi Yokoi; Elaine B Alajar; April Ann Bermudez-Delos Santos; Elmer Jasper B Llanes; Gay Marjorie Obrado-Nabablit; Noemi S Pestaño; Felix Eduardo Punzalan; Bernadette Tumanan-Mendoza Journal: J Atheroscler Thromb Date: 2020-07-04 Impact factor: 4.928