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Ultrasound Assessment of Flow-Mediated Dilation of the Brachial and Superficial Femoral Arteries in Rats
Published on: November 3, 2016
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Peak shear and peak flow mediated dilation: a time-course relationship
Nicholas G Evanoff1, Aaron S Kelly2,3, Julia Steinberger2
1Laboratory of Integrative Human Physiology, School of Kinesiology, University of Minnesota, Minneapolis, MN, 55455.
Journal of Clinical Ultrasound : JCU
|December 23, 2015
Summary
Children exhibit lower peak shear stress and flow-mediated dilation (FMD) responses compared to adults. However, the timing interval between peak shear stress and peak FMD remains consistent across age groups, suggesting age-related vascular dynamics.
Area of Science:
- Vascular physiology
- Pediatric cardiology
- Cardiovascular research
Background:
- Flow-mediated dilation (FMD) assesses endothelial function.
- Shear stress is a key stimulus for FMD.
- Understanding age-related differences in vascular response is crucial.
Purpose of the Study:
- To investigate the temporal relationship between brachial artery peak shear stress and FMD in children and adults.
- To compare shear stress and FMD dynamics across different age groups.
Main Methods:
- Sonographic imaging was used to track brachial artery diameter and shear stress.
- Reactive hyperemia was induced to measure FMD and shear stress.
- 122 children and 350 adults participated in the study.
Main Results:
- Children had significantly higher peak shear stress, shear area under the curve, and peak FMD compared to adults.
- The time to reach peak shear stress and peak FMD was shorter in children.
- The time interval between peak shear stress and peak FMD was similar in both children and adults.
Conclusions:
- Children demonstrate a reduced shear stress stimulus and FMD response relative to adults.
- Despite age-related differences in vascular dynamics, the temporal coupling between shear stress and FMD is preserved.
- This suggests potential alterations in smooth muscle cell responsiveness or other age-dependent vascular factors.
