The Björk-Shiley valve: intermediate-term follow-up

Area of Science:

• Cardiovascular Surgery
• Biomaterials Science
• Clinical Outcomes Research

Background:

• The Björk-Shiley mechanical valve has been used for decades in aortic and mitral valve replacement.
• Understanding long-term outcomes and associated risk factors is crucial for patient management.

Purpose of the Study:

• To evaluate the intermediate-term survival and complication rates of the Björk-Shiley prosthesis.
• To identify factors influencing late survival after aortic, mitral, or double valve replacement.

Main Methods:

• A cohort of 643 patients undergoing Björk-Shiley valve replacement was followed for 1-72 months (median 38 months).
• Survival rates, thromboembolism, valve thrombosis, and functional class improvement were analyzed.
• Multivariate analysis identified factors associated with late survival.

Main Results:

• Intermediate-term survival was comparable to other prosthetic devices.
• Patient-related factors (previous valve surgery, race, functional class) and perioperative events significantly impacted survival.
• Freedom from thromboembolism was favorable, but valve thrombosis occurred in 15 patients, causing 13 deaths.
• Most patients showed improvement in New York Heart Association (NYHA) functional class.

Conclusions:

• The Björk-Shiley valve is durable and effective for valve replacement.
• Thromboembolism and thrombosis remain significant concerns, necessitating careful patient selection and monitoring.
• Non-device patient characteristics are critical determinants of long-term survival after valve replacement.