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5 CONCLUSIONS
Pressure signals registered before P
a
(t) and behind
P
d
(t) the stenosis possess different oscillatory
behaviour, because of the wave reflections at the site
of the stenosis. The important diagnostic parameters
crucial for decision making on surgery of the
stenosis (stenting, bypass, grafts) are made on the
signals measured in the presence of the guiding
catheter and wire with the pressure gauge, while the
computational approaches for estimation of the
hemodynamic parameters are based on the
simplified models. It was shown the mathematical
model of the pulsatile flow between the rigid and
compliant cylinders is more precise for the virtual
FFR estimation than the model of the flow in the
hollow rigid tube without any obstacles along the
axis.
Is was shown the mathematical model of the
steady and pulsatile flow between the rigid and
compliant surfaces predicts more accurate results for
the diagnostic index < P
d
(t)>/< P
a
(t)>. It was also
shown the pulsatile high frequency component gives
complementary information on the stenosis severity.
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