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Blood Flow Patterns of the Aorta and Large Arteries |
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Todua
F., Beraia M. |
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Key words: hemodynamic, aorta blood flow |
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Purpose:
The aim of the study was to reveal hemodynamic peculiarities in aorta and
its branches in evaluation of local endothelial damage for atherosclerotic
plaque formation. Method
and Materials: 5 healthy persons were investigated in 1.5T MR imager
(Siemens-Sonata Cardio) and color-coded DU (SSD-780 Philips with 2.5 MHz
transducer) to measure blood flow (mean velocity, pick velocity, mean
flow, net flow, pulsate and resistive indexes) at 11 different sites of
aorta. Results:
Blood flow pulsation and retrograde flow in the aortic branches are less
evident. Stabilization of pulsate flow is bound to: changes in diameter
and resistive, ramifing of the branches in a normal shape (900),
and blood flow profile in the aortic arch; the additional centrifugal
forces in aortic arch causing different velocities of blood flow at the
different sites of arch. At the systolic pick blood flow at the definite
parts of aorta blood flow becomes retrogrative, which allows blood flow to
the left coronal arteries and closing of aortic valves. Pick retrogrative
blood flow in diastole is most evident at the branching of aortic arch
with blood acceleration that is 8 times higher than at other parts of
aorta causign endothelial cell demage in atherosclerosis. |
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Literature: 1.
F.Todua, M.Beraia. Blood-flow patterns of the aorta and its relationship
to aortic branches. ESCR. Cardiac CT and MRI Meeting. Berlin.
Germany. |