Strut fractures in De Bakey aortic valves

Area of Science:

• Cardiovascular Surgery
• Biomedical Engineering
• Prosthetic Heart Valves

Background:

• The De Bakey aortic valve prosthesis, implanted in 1973, is a mechanical heart valve designed for aortic valve replacement.
• Long-term durability and potential failure modes of early prosthetic heart valves are critical considerations in cardiovascular surgery.

Observation:

• Strut fractures were observed in two out of six patients (33%) who received the De Bakey aortic valve prosthesis.
• Fractures occurred at 7.5 and 9 years post-implantation, indicating a potential long-term mechanical failure.
• One patient experienced fatal cage and ball embolization due to prosthesis failure.

Findings:

• Mechanical failure, specifically strut fracture, is a significant risk associated with the early De Bakey aortic valve prosthesis.
• The time to failure suggests a material fatigue or design limitation over prolonged use.
• Prompt diagnosis and intervention can prevent catastrophic outcomes, as demonstrated by the successful valve replacement in the second patient.

Implications:

• Valve replacement is strongly recommended for patients with the De Bakey aortic valve prosthesis of this specific design and implantation era.
• This case highlights the importance of long-term surveillance for prosthetic heart valves and the need for updated designs.
• Further research into the failure mechanisms of older prosthetic devices is warranted to improve future implantable cardiac technologies.