izvorni znanstveni rad
The arterial pressure waveform consists of systolic and of diastolic phases. Systolic phase includes blood ejection from the left ventricle into the aorta, which lasts from the aortic valve opening to the valve closing, when the diastolic phase starts. During diastolic phase the aorta is emptying due to blood flow from the aorta to the peripheral vascular beds. These two phases are separated by an incisure in the pressure profile, which includes a sudden pressure drop at the end of systolic phase and a sudden pressure growth at the beginning of diastolic phase. Today’s common believe is that the cause of the incisure is a water hammer caused by the aortic valve closing. Further to this interpretation, we hypothesized in this paper that the wall viscosity also contributes to the incisure appearance. Based on the one-dimensional numerical model simulation of blood flow in the arterial tree, we demonstrated that the incisure is deepening by the wall viscosity increase.
Incisure ; Method of Characteristics ; Windkessel model, Arterial Wall Viscoelasticity
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