age-related vascular changes affect turbulence in aortic blood flow
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ID: 227091
2018
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Abstract
Turbulent blood flow is implicated in the pathogenesis of several aortic diseases but the extent and degree of turbulent blood flow in the normal aorta is unknown. We aimed to quantify the extent and degree of turbulece in the normal aorta and to assess whether age impacts the degree of turbulence. 22 young normal males (23.7 ± 3.0 y.o.) and 20 old normal males (70.9 ± 3.5 y.o.) were examined using four dimensional flow magnetic resonance imaging (4D Flow MRI) to quantify the turbulent kinetic energy (TKE), a measure of the intensity of turbulence, in the aorta. All healthy subjects developed turbulent flow in the aorta, with total TKE of 3–19 mJ. The overall degree of turbulence in the entire aorta was similar between the groups, although the old subjects had about 73% more total TKE in the ascending aorta compared to the young subjects (young = 3.7 ± 1.8 mJ, old = 6.4 ± 2.4 mJ, p < 0.001). This increase in ascending aorta TKE in old subjects was associated with age-related dilation of the ascending aorta which increases the volume available for turbulence development. Conversely, age-related dilation of the descending and abdominal aorta decreased the average flow velocity and suppressed the development of turbulence. In conclusion, turbulent blood flow develops in the aorta of normal subjects and is impacted by age-related geometric changes. Non-invasive assessment enables the determination of normal levels of turbulent flow in the aorta which is a prerequisite for understanding the role of turbulence in the pathophysiology of cardiovascular disease.
| Reference Key |
ha2018frontiersage-related
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| Authors | ;Hojin Ha;Hojin Ha;Hojin Ha;Magnus Ziegler;Magnus Ziegler;Martin Welander;Martin Welander;Niclas Bjarnegård;Carl-Johan Carlhäll;Carl-Johan Carlhäll;Carl-Johan Carlhäll;Marcus Lindenberger;Marcus Lindenberger;Toste Länne;Toste Länne;Tino Ebbers;Tino Ebbers;Petter Dyverfeldt;Petter Dyverfeldt |
| Journal | Journal of clinical and experimental dentistry |
| Year | 2018 |
| DOI |
10.3389/fphys.2018.00036
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| URL | |
| Keywords | Keywords not found |
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