Aortic Valve Disease Clinical Trial
Official title:
Twenty-five-year Experience With the Medtronic-Hall Valve Prosthesis
Background-:. The Medtronic-Hall (MH) valve was developed and for the first time implanted in Oslo in 1977. A total of 1,104 patients received this valve at Rikshospitalet-Radiumhospitalet HF in the period 1977-87. In the present study we followed all 816 patients undergoing aortic valve replacement (AVR) over a 25-year period.
The Medtronic-Hall (MH) tilting valve disk was first implanted in Oslo in June 1977. From
1977 through 1987, the valve was used as the only valve of choice and inserted in a total of
1,104 consecutive patients at our department.
The MH valve is made of a single piece of titanium with no welds. The disk is made of
tungsten impregnated graphite with a carbon pyrolytic coating. The tungsten renders the disk
radiopaque. In the aortic position the maximal opening is 75˚. A central aperture in the
disk allows free rotation. The valve is rotatable in the sewing ring. The sewing ring is
made of Teflon. Aortic sizes are 20-31 mm (outer diameter).
The initial clinical results were published in 1979 (1). The cohort of patients has been
followed-up and analysed at 5, 10 and 15 years (2-5). In the present study we report our
25-year follow-up data for the 816 patients undergoing aortic valve replacement (AVR) with
special reference to survival, functional status, valve-related complications and the impact
of concomitant surgery.
;
Observational Model: Cohort, Time Perspective: Retrospective
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