title: In vitro ultrasound characterization of a polyurethane trileaflet valve.
abstract: Polyurethane synthetic trileaflet valves were compared with commercial prostheses in vitro, in a pulse duplicator using ultrasound to characterize the flow velocities and patterns. Flow-pressure drop behavior was in the middle range of other prosthetic valves. Diastolic regurgitant jets were located by color Doppler ultrasound, and there appeared to be some leakage through the leaflet fold at the commissure. Nevertheless, the closing volumes and closed valve leakage volumes were, on average, lower than other prosthetic valves. Systolic 20 Hz spectral oscillations detected with pulsed Doppler and continuous wave Doppler were attributed to leaflet flutter in the open valve.
authors: Cardiac Surgery Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892.
authors: S F
authors: SF
authors: Stewart
authors: F
authors: F
authors: Burté
authors: E
authors: E
authors: Eidbo
authors: W J
authors: WJ
authors: Kolff
authors: L S
authors: LS
authors: Yu
authors: R E
authors: RE
authors: Clark
mesh_terms: D001021:Aortic Valve / Q000502:physiology*; D001705:Bioprosthesis; D001783:Blood Flow Velocity / Q000502:physiology; D015150:Echocardiography, Doppler; D006350:Heart Valve Prosthesis; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D008955:Models, Cardiovascular; D011140:Polyurethanes; D011474:Prosthesis Design
chemical_list: D011140:Polyurethanes