Objective:

To assess changes in transvalvular gradients following radiation therapy (RT) in patients with previously implanted bioprosthetic valves.

Approach:

Key Findings:

• Transvalvular gradients remained stable in control patients but increased significantly over time in the RT group (Friedman's test P < 0.0001).
• Total RT dose and mean heart RT dose significantly predicted increases in transvalvular gradients within 12 months (R² = 0.41, P = 0.001) and between 12 and 24 months (R² = 0.62, P < 0.0001).
• Shorter time between valve implantation and RT predicted greater gradient increases.
• No patients required re-intervention during the follow-up period.

Interpretation:

Chest RT is associated with early, dose-dependent elevations in transvalvular gradients among patients with bioprosthetic valves.

Limitations:

• Small sample size of 23 patients.
• Retrospective design may introduce selection bias.

Conclusion:

The findings highlight the need for further research to understand the durability of irradiated bioprosthetic valves.

Attribution Notice

This content is an AI-generated, fully rewritten summary based on a published scholarly article. It does not reproduce the original text and is not a substitute for the original publication. Readers are encouraged to consult the source for full context, data, and methodology.