Post-trial follow-up methodology in large randomized controlled trials: a systematic review protocol.

Area of Science:

• Clinical research methodology
• Evidence-based medicine
• Long-term health outcomes

Background:

• Clinical trials often have short follow-up periods, potentially underestimating treatment benefits and failing to detect long-term adverse events.
• Prolonged follow-up of trial participants is essential for comprehensive efficacy and safety assessments.
• This systematic review protocol outlines a qualitative comparison of post-trial follow-up methods in large randomized controlled trials.

Purpose of the Study:

• To systematically review and qualitatively compare diverse post-trial follow-up methodologies employed in large randomized controlled trials.
• To identify and describe common practices in extended participant follow-up beyond the primary trial duration.
• To inform the design of more effective and efficient future post-trial follow-up strategies.

Main Methods:

• Systematic search of electronic databases and clinical trial registries using a predefined strategy.
• Inclusion of large randomized controlled trials with over 1000 adult participants.
• Data extraction by two independent reviewers, with discrepancies resolved by a third reviewer, focusing on trial methods, retention rates, and missing data. Bias assessment using the Cochrane Risk of Bias tool.

Main Results:

• The review will record and compare trial methods, participant retention rates, and the prevalence of missing data across different post-trial follow-up approaches.
• An evaluation of potential bias will be conducted, assessing if the quality of original trial methods predicts the quality of post-trial follow-up methodology.
• The findings will provide a descriptive overview of how trial participants have been followed up post-trial.

Conclusions:

• Post-trial follow-up provides critical data on the long-term benefits and risks of medical interventions.
• Despite logistical challenges and costs, effective post-trial follow-up is vital for robust clinical evidence.
• This systematic review aims to guide the development of optimized post-trial follow-up designs for future research.