Analysis of Mechanical Prostheses Excised from the Aortic Valve Position

Area of Science:

• Cardiovascular Surgery
• Biomaterials Science
• Clinical Medicine

Background:

• Mechanical prosthetic valves are commonly used for aortic valve replacement.
• These prostheses can dysfunction over time due to various complications.
• Understanding explantation reasons and outcomes is crucial for patient care.

Purpose of the Study:

• To analyze clinical and morphologic findings in patients undergoing explantation of mechanical aortic valves.
• To identify the primary causes of mechanical prosthetic valve failure.
• To assess patient survival rates following explantation.

Main Methods:

• Retrospective analysis of 33 patients who had mechanical aortic valve explantation.
• Evaluation of explantation reasons: prosthetic stenosis, regurgitation (thrombus, pannus, parabasilar).
• Assessment of patient survival at follow-up, stratified by infection status.

Main Results:

• Common explantation causes included thrombus, pannus, and parabasilar regurgitation.
• Of 33 patients, 25 were uninfected and 8 were infected.
• Survival rates post-explantation were high: >1 year for 23/25 non-infected and 7/8 infected patients.

Conclusions:

• Mechanical aortic valve explantation is frequently necessitated by valve degeneration or complications.
• Prosthetic valve infection significantly impacts outcomes but does not preclude survival.
• High survival rates post-explantation suggest successful management strategies are achievable.