Twelve-year comparison of a Bjork-Shiley mechanical heart valve with porcine bioprostheses.

@article{Bloomfield1991TwelveyearCO,
  title={Twelve-year comparison of a Bjork-Shiley mechanical heart valve with porcine bioprostheses.},
  author={Peter Bloomfield and David John Wheatley and Robin J. Prescott and Hugh C. Miller},
  journal={The New England journal of medicine},
  year={1991},
  volume={324 9},
  pages={
          573-9
        }
}
BACKGROUND Patients undergoing heart-valve replacement may receive a mechanical prosthesis, necessitating lifelong anticoagulant treatment, or a porcine bioprosthesis, which involves no absolute need for anticoagulants. METHODS We carried out a randomized, prospective trial to compare the durability of the Bjork-Shiley mechanical prosthesis (spherical tilting-disk model) and the incidence of valve-related complications with those variables in the Hancock and the Carpentier-Edwards porcine… 

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The porcine bioprosthetic valve. Twelve years later.