12 Questions
What is the preferred orientation of monoleaflet valves in the aortic position?
Major orifice toward the right posterior aortic wall
What type of flow pattern is characterized by bileaflet mechanical valves?
Three separate jets due to a smaller central orifice
What is the range of the opening angle of the leaflets of bileaflet valves relative to the annulus plane?
75 to 90 degrees
Which type of valve shows a small amount of normal regurgitation with an approximate volume of 5-9 mL per beat?
Monoleaflet valves
What is suggested as an optimal orientation for bileaflet valves in the mitral position?
Perpendicular to the normal plane of mitral valve opening
Which type of bileaflet valve does not show a clear advantage in specific leaflet orientation when implanted in the aortic position?
St.Jude Medical valves
What is the main mechanism responsible for the thrombogenicity of the Starr-Edwards 1260 valve?
Large wake generated in the central part
Which component of the Starr-Edwards 1260 valve is primarily visualized on colorflow Doppler imaging?
Closing volume
What is the purpose of lateral or central metal struts in monoleaflet or tilting-disk valves?
To secure the disk within the rigid annulus
What results from the opening angle of the disk relative to the valve annulus being between 60 to 80 degrees in monoleaflet or tilting-disk valves?
Generation of a semicircular jet through the minor orifice
What distinguishes the flow through the major orifice from that through the minor orifice in monoleaflet or tilting-disk valves?
Higher velocity in flow through the minor orifice
Why is the Starr-Edwards 1260 valve no longer implanted despite its relatively good durability?
Further development of other valve types
Learn about the design and functioning of the Starr-Edwards 1260 ball-cage valve, its components, and the flow dynamics associated with its operation. Understand how the valve structure can lead to thrombogenicity and high pressure in patients.
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