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Influence of the central-to-peripheral arterial stiffness gradient on the timing and amplitude of wave reflections

Hickson, Stacey S, Nichols, Wilmer W, Yasmin, ., McDonnell, Barry J, Cockcroft, John Ronald, Wilkinson, Ian B and McEniery, Carmel M 2016. Influence of the central-to-peripheral arterial stiffness gradient on the timing and amplitude of wave reflections. Hypertension Research 39 (10) , pp. 723-729. 10.1038/hr.2016.64

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In individuals with compliant aortas, peripheral muscular artery stiffness exceeds central elastic artery stiffness. With ageing, central stiffness increases, with little change in peripheral stiffness, resulting in a reversal of the normal stiffness gradient. This reversal may reduce wave reflection amplitude, due to movement of the major “effective” reflection site further from the heart. To test this, we investigated the relationship among arterial stiffness gradients (normal and reversed), wave reflection amplitude and reflection site distance. Subjects aged ≥50years were recruited from the Anglo-Cardiff Collaborative Trial. Central stiffness was assessed by carotid-femoral pulse wave velocity (cfPWV). In study 1, peripheral PWV was also measured in the arm (carotid-radial, crPWV), and in study 2 in the leg (femoral-dorsalis pedis, fpPWV). Reflection site distance was calculated from cfPWV and reflected wave travel time. Subjects were dichotomized into those with a normal stiffness gradient (peripheral>central PWV), or a reversed gradient (peripheral<central PWV). In study 1, reflection site distance was greater in subjects with a reversed gradient (P<0.01), whereas time to reflection was lower (P<0.001). Both augmentation pressure (P<0.001) and augmentation index (P<0.05) were greater in subjects with a reversed gradient. In study 2, augmentation pressure, augmentation index and reflection site distance were greater in subjects with a reversed stiffness gradient (P<0.01, P<0.05 and P<0.01, respectively), and time to reflection was not different between groups. A reversed arterial stiffness gradient is associated with increased reflection site distance and a paradoxical increase in reflected wave amplitude, and augmentation index.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Medicine
Uncontrolled Keywords: arterial stiffness gradient; augmentation index; pulse wave velocity; wave reflection; central pulse pressure.
Publisher: Nature Publishing Group
ISSN: 0916-9636
Date of Acceptance: 5 May 2016
Last Modified: 10 Jul 2019 10:36

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