Aortic valve replacement with Starr-Edwards and Björk-Shiley prosthesis. Long term results and statistical analysis of some risk factors
Peronace, B.; Cornelli, U.; Marcazzan, E.; Pellegrini, A.
Giornale Italiano di Cardiologia 10(8): 1024-1030
1980
ISSN/ISBN: 0046-5968 PMID: 6780402 Document Number: 160106
Patients (285) underwent aortic valve replacement between 1972-1977. Patients (197) had a Starr-Edwards prosthesis and 88 patients had a Bjork-Shiley prosthesis; both groups presented similar risk factors. The follow-up varied between 6 mo. minimum-72 mo. maximum with a mean of 3.6 yr. The statistical results were based on the multi-factor analysis (cluster) to define the homogenous groups of patients with the Starr prosthesis and the Bjork prosthesis. The best survival percentage after 72 mo. from surgery date occurred in patients with the Bjork prosthesis compared with those patients with the Starr prosthesis (93 and 71%, respectively). The difference is important from the statistical point of view. The embolic incidence after such a period is nearly equal (16% for Bjork and 14% for Starr). Cluster analysis of age, duration of symptoms before surgery, NYHA [New York Heart Association] class and Cardio-thoracic ratio did not prevent real and proper risk factors for the long-term condition; these results were observed despite differences in mortality and embolic incidence with regards to the relation of NYHA class and symptoms' duration. One of the most important risks derived from the type of prosthesis used.