This in vitro study demonstrates the utility of ultrasonic doppler systems in mapping velocity fields and regurgitant flows downstream of various prosthetic aortic valves in an elastic aortic arch model.
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Maps prosthetic valve wakes and regurgitant flows in elastic arch model; leaves open clinical translation of elasticity effects.
Using a cardiovascular simulator to duplicate in vitro the flow conditions through valves in aortic position, bidimensional velocity maps very near the valve are reconstructed, from an ultrasonic 8 Mhz doppler system, in an elastic model of the ascending aortic arch. Three mechanical heart valves representative of the different types of commercial models (a tilting disc, a ball in cage and a two-leaflet valve) and a new bileaflet prototype were investigated. From examination of the velocity field, it is possible to define the main characteristics of the valve wake and to observe the development of negative velocities associated with regurgitant flows. From a comparison with tests in rigid tubes, the role played by the arch elasticity is analysed.
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Tonietto et al. (1992) studied this question.
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