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Biophysical Properties Of The Aorta, Left Ventricular Properties And Exercise Capacity In Obese Adolescents | 6398
ISSN: 2165-7904
Journal of Obesity & Weight Loss Therapy
Open Access
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We sought to determine whether childhood obesity is associated with increased aortic stiffness by measuring the biophysical
properties of the aorta in obese children using a non-invasive echo-Doppler method. We also sought to determine if any
changes were associated with exercise capacity. Increased aortic stiffness is a strong predictor of future cardiovascular events
and mortality in adults. Obesity is known to be associated with increased aortic stiffness and arterial disease in adults. Vascular
function has been shown to be abnormal in obese adolescents. We prospectively evaluated a cohort of obese children (N=63) and
compared them to normal weight controls (N=55). Anthropometric data were recorded. Using an echo-Doppler method, pulse
wave velocity (PWV), aortic input impedance (Zi), characteristic impedance (Zc), arterial pressure-strain elastic modulus (Ep),
arterial wall stiffness index (β-index), and peak aortic velocity (PAoV) were calculated. We correlated our findings with lipid
levels. We assessed left ventricular dimensions and standard measures of cardiac function. Cardiopulmonary exercise testing
was performed on all obese children.Compared to normal-weight children, obese children have higher PWV, Zc, β-index, Ep
and PAoV. Obese children had higher systolic blood pressure (BP) than normal-weight children but there was no difference
in diastolic BP. LV dimensions and standard measures of cardiac systolic function were similar in the two groups while obese
children had altered diastolic properties. Left ventricular (LV) mass was higher in obese children. There was no association
between lipid levels and the biophysical properties of the aorta. Absolute oxygen consumption was 122% predicted while relative
oxygen consumption was 68% predicted in obese children.
Measures of the biophysical properties of the aorta are already abnormal in obese children reflecting increased aortic stiffness
at this early stage of disease. Obese children also have increased LV mass, altered diastolic properties and abnormal exercise
capacity. PWV may be useful in monitoring progression of arterial disease or the effect of therapeutic interventions.
Biography
G Sandor is Emeritus Professor in the Department of Paediatrics, UBC, and Director of the Echolab, BC Children?s Hospital. His interests are the
non-invasive assessment of cardiac and vascular function in congenital and acquired paediatric cardiac disease.
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