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By Y. C. Fung

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Extra resources for Biodynamics: Circulation

Example text

Is shown in the uppermost part of the figure. When the ventricular pressure exceeds the pressure in the aorta the aortic valve opens and blood is ejected into the aorta. Later, when the ventricular pressure becomes smaller than that in the aorta the ejecting jet decelerates . At the instant marked as AC the aortic valve closes. The aortic pressure curve reflects the closure of the aortic valve with a dicrotic notch. ) is similar to that of the left ventricle, but at a lower level. The pulmonary artery pressure curve is similar to that of the aorta but also at a lower level.

When the aortic pressure rises sufficiently so that deceleration of the flow occurs, an adverse pressure gradient is produced, P2 at the valve cusp tip exceeds the pressure PI at a station upstream. The higher pressure P2 causes a greater flow into the sinus which carries the cusp toward apposition. ,~ ......... 5 :4 Flow pattern within the sinus of Valsalva . The peak deceleration occurs just before the valve closure. The vortical motion established earlier upon the opening of the valve has the merit of preventing the valve cusp from bulging outward to contact the walls of the sinuses.

It is also called the reducedfrequency. The Reynolds number and Strouhal number together define the dynamic similarity for model testing . The flow patterns in Fig. 5: 5 show that the deceleration of the jet and the associated adverse pressure gradient are the mechanism responsible for valve closure during diastole. The deceleration causes the pressure within the valve to fall below that of the surrounding fluid in the ventricle, and an inward motion of the ventricular fluid results which closes the valve.

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