Document Detail


Ten years' experience with the Björk-Shiley tilting disc valve.
MedLine Citation:
PMID:  470414     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
More than 10 years of clinical experience with 1,800 consecutive valve replacements with the Björk-Shiley tilting disc valve were focused on improving its durability, flow dynamics, thromboresistance, and in vivo functional control. Although the original Delrin disc functions excellently after 10 years in the human circulation, the durability of the prosthetic valve was further prolonged by the introduction of pyrolytic carbon as disc material. The opening mechanism was also reinforced by integrating the bearing struts with the valve ring. No other presently available heart valve prosthesis shows such a low resistance to flow for a given tissue diameter. The disc was equipped with a ring-shaped radiopaque marker that permitted noninvasive functional control. The 5 year survival rates were 82% after aortic, 66% after mitral, and 66% after mitral and aortic valve replacements, including the operative mortality rates. The incidence of systemic emboli was 0.7% per year after aortic, 4.2% per year after mitral, and 2.2% per year after mitral and aortic valve replacements with anticoagulation treatment. The incidence of obstruction by thrombosis was 0.3% per year for aortic, 1.3% per year for mitral, and 2.3% per year tricuspid prostheses. The new convex-concave model decreases the stagnation zone behind the disc, decreases emboli from 4.2% to 1.2% per year after mitral valve replacement, and has a lower gradient.
Authors:
V O Björk; A Henze
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of thoracic and cardiovascular surgery     Volume:  78     ISSN:  0022-5223     ISO Abbreviation:  J. Thorac. Cardiovasc. Surg.     Publication Date:  1979 Sep 
Date Detail:
Created Date:  1979-10-26     Completed Date:  1979-10-26     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  0376343     Medline TA:  J Thorac Cardiovasc Surg     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  331-42     Citation Subset:  AIM; IM    
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MeSH Terms
Descriptor/Qualifier:
Aortic Valve Stenosis / surgery
Carbon
Contrast Media
Heart Valve Prosthesis / mortality,  standards*
Heart Valves / surgery*
Humans
Mitral Valve / surgery
Postoperative Complications
Prosthesis Design / standards*
Stress, Mechanical
Chemical
Reg. No./Substance:
0/Contrast Media; 7440-44-0/Carbon

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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