The Journal of Thoracic and Cardiovascular Surgery, Vol 75, 309-312, Copyright © 1978 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association
Ball variance and fracture of mitral valve prosthesis causing recurrent thromboemboli
LD Joyce, RW Emery and DM Nicoloff
This report documents the ninth case of ball variance in a Starr- Edwards
Model 6000 mitral prosthesis occurring 10 years, 9 months after
implantation. It is the fourth case of fracture of a mitral ball of any
type. As this case illustrates, the presence of ball variance in the mitral
position may be subtle. One must carry a high index of suspicion if the
diagnosis is to be made and treatment undertaken before catastrophic events
take place. The incidence of ball variance is likely to increase with the
length of implantation. We recommend surgical replacement of the defective
prosthesis immediately upon confirmation of diagnosis.